摘要：
Laser cladding was used to fabricate the high entropy alloy (HEA) coating of FeCoCrNiMnx (x = 0, 0.5, 1). Coatings were studied to determine how Mn affected the microstructure, microhardness, and tribological property. Molecular dynamics simulations were used to examine the atomic-scale deformation and wear behavior of FeCoCrNiMn HEA coatings. FeCoCrNiMnx HEA coatings were composed of single FCC-type solid solution. Friction reduction and wear resistance are improved with Mn doping. When compared to the substrate and FeCoCrNi coating, the wear resistance of Mn1 coating is superior by 69.34% and 25.05%, respectively (wear rate is 3.74 x10- 5 mm3/N center dot m). The findings of molecular dynamics simulations demonstrate that Mn-doping significantly enhances strain hardening by the friction-induced FCC phase transition to the HCP phase. The deformation mechanism of Mn1 coating, as determined by the dislocation evolution pattern, is twinning induced plasticity, which improves the plasticity, strength, and work-hardening rate of coating all at once.
期刊：
Construction and Building Materials,2024年411:134825 ISSN：0950-0618
通讯作者：
Sun, DL
作者机构：
[Zou, Weihua; Wang, Zhangheng] Cent South Univ Forestry & Technol, Coll Furniture & Art Design, Changsha 410004, Hunan, Peoples R China.;[Sun, Delin; Song, Ling; Sun, Zhenyu; Zhao, Shan; Liu, Wenshuang; Yu, Minggong; Zou, Weihua; Liu, Fang; Wang, Zhangheng] Cent South Univ Forestry & Technol, Coll Mat Sci & Engn, Changsha 410004, Hunan, Peoples R China.;[Sun, Delin; Sun, DL] 498 Shaoshan South Rd, Changsha, Hunan, Peoples R China.
通讯机构：
[Sun, DL ] 4;498 Shaoshan South Rd, Changsha, Hunan, Peoples R China.
关键词：
Superhydrophobic wood;Wet chemical method;Wettability;Bond strength;Interface modification
摘要：
Superhydrophobic modification transforms the wood surface into a non-wetting state, which hinders the effective spreading and penetration of the adhesive at the gluing interface. In this study, a wet chemical method was used to optimize the wettability of the glued interface of superhydrophobic wood (S-wood) through NaOH@KH-550 synergistic treatment. The method can improve the structrue and chemical condition to increase the adsorption capacity of the wood surface for the adhesive, and the bond strength of S-wood increased to 3.21 MPa, which was beneficial to the efficient use of S-wood in construction and furniture fields.
摘要：
The use of renewable materials as structural components for constructing superhydrophobic coatings is an important direction for future development. Here, a robust and photothermal superhydrophobic coating (with a water contact angle of 166.1 +/- 0.8 degrees and a sliding angle of 2.8 +/- 0.1 degrees) is fabricated using dual-size lignin micro-nanospheres (LMNSs), comprising lignin microspheres (m-LMNSs) and nanospheres (n-LMNSs), which successively settle on the substrate surface under the effect of gravity. The microstructure armor formed by the combination of m-LMNSs and epoxy resin endows the coating with excellent abrasion resistance and bonding strength. Moreover, the presence of n-LMNSs within the cavities provides water repellency. The coating maintains superhydrophobicity even after the abrasion distance exceeds 320 cm or after 210 tape peeling cycles. The coating also exhibits robustness under various forms of mechanical and chemical damage. Furthermore, the photothermal effect of the coating enables rapid heating of its surface temperature from similar to 13 to 112 degrees C in only 60 s under laser irradiation. This innovative structural regulation approach enhances the durability and photothermal performance of lignin-based superhydrophobic coatings, demonstrating the practical applicability of the approach.
作者：
Yuan, Jianzhong;Wan, Caichao;Wei, Song;Chai, Huayun;Tao, Tao
期刊：
CURRENT ORGANIC SYNTHESIS,2024年 ISSN：1570-1794
作者机构：
[Wei, Song; Yuan, Jianzhong; Tao, Tao; Wan, Caichao; Chai, Huayun] College of Materials Science and Engineering, Central South University of Forestry and Technology, Changsha 410004, P. R. China;[Wan, Caichao] Yihua Lifestyle Technology Co., Ltd, Huaidong Industrial Zone, Lianxia Town, Chenghai District, Shantou 515834, P.R. China
摘要：
BACKGROUND: Nanocellulose is not only a biocompatible and environmentally friendly material but also has excellent mechanical properties, biodegradability, and a large number of hydroxyl groups that have a strong affinity for water. These characteristics have attracted significant attention from researchers in the field of glucose sensing. OBJECTIVE: This review provides a brief overview of the current research status of traditional materials used in glucose sensors. The sensing performance, chemical stability, and environ-mental properties of nanocellulose-based glucose sensors are compared and summarized based on the three sensing methods: electrochemical sensing, colorimetric sensing, and fluo-rescence sensing. The article focuses on recent strategies for glucose sensing using nanocel-lulose as a matrix. The development prospects of nanocellulose-based glucose sensors are also discussed. CONCLUSION: Nanocellulose has outstanding structural characteristics that contribute signifi-cantly to the sensing performance of glucose sensors in different detection modes. However, the preparation process for high-quality nanocellulose is complicated and has a low yield. Furthermore, the sensitivity and selectivity of nanocellulose-based glucose sensors require further improvement.
摘要：
The function of the pith ring and cortex in biological and fluid exchanges with the surrounding environment implies a natural intelligence. Their ingenious structure enables bamboo to thrive and impacts its processing and utilization. As drying is an essential step in bamboo product manufacturing, in this study, the effects of the pith ring and cortex on the water loss, deformation, and cracking of bamboo at the macroscopic, tissue, and cellular levels were investigated. Our study revealed a previously unknown mechanism of bamboo drying deformation. The cortex significantly affected the rate of water loss, whereas the pith ring did not significantly reduce the drying rate. Three deformation mechanisms originating from the pith ring were identified: the cell structure and orientation, self-flattening during drying, and excellent bending performance in the chord direction. These pith ring characteristics led to a larger radius of the bamboo splits during drying. These findings expand our understanding of the natural intelligence of the inner and outer layers of bamboo and provide important insights into bamboo drying, deformation, cracking, bionics, and composite material manufacturing.
作者机构：
Authors to whom correspondence should be addressed.;College of Materials Science and Engineering, Central South University of Forestry and Technology, 498 South Shaoshan Road, Changsha 410004, China;College of Forestry, Central South University of Forestry and Technology, 498 South Shaoshan Road, Changsha 410004, China;[Wu, Lei; Liang, Lin-Fu] Authors to whom correspondence should be addressed.<&wdkj&>College of Materials Science and Engineering, Central South University of Forestry and Technology, 498 South Shaoshan Road, Changsha 410004, China<&wdkj&>College of Forestry, Central South University of Forestry and Technology, 498 South Shaoshan Road, Changsha 410004, China;[Ge, Zeng-Yue; Xue, Jun; Chen, Jun-Kun; Liao, Xiao-Wen] College of Materials Science and Engineering, Central South University of Forestry and Technology, 498 South Shaoshan Road, Changsha 410004, China<&wdkj&>College of Forestry, Central South University of Forestry and Technology, 498 South Shaoshan Road, Changsha 410004, China
通讯机构：
[Lei Wu; Lin-Fu Liang] A;Authors to whom correspondence should be addressed.<&wdkj&>College of Materials Science and Engineering, Central South University of Forestry and Technology, 498 South Shaoshan Road, Changsha 410004, China<&wdkj&>College of Forestry, Central South University of Forestry and Technology, 498 South Shaoshan Road, Changsha 410004, China
摘要：
Whitfordiodendron filipes var. tomentosum is an endemic plant in China. There have been no chemical or pharmacological studies of this plant reported before. In the current research, eight triterpenes and two steroids were obtained. Their structures were established by the analysis of NMR data and comparison with those reported in the literature. These ten structurally diverse compounds comprised five distinct carbon frameworks with different functionalities. The chemotaxonomic significance of these secondary metabolites was discussed, disclosing the common components between the variant W. filipes var. tomentosum and the species W. filipe. Evaluation of α-glucosidase inhibitory activities of these isolates disclosed that compounds 1, 2, 4, and 6 exhibited significant α-glucosidase inhibitory activities (IC(50) = 16.6-19.2 μM), which were close in value to the positive control acarbose (IC(50) = 11.5 μM). Moreover, the binding modes between the biologically active compounds 1, 2, 4, and 6 and the α-glucosidase protein were preliminarily studied using molecular docking. This study not only showed the chemical and biological profile of the plant W. filipes var. tomentosum but also revealed that these components could be developed as hypoglycemic lead compounds.
作者机构：
[Kexin Xiao; Hong Chen] College of Materials Science and Engineering, Central South University of Forestry and Technology, Changsha 410004, China;[Pengfei Ren] China University of Mining and Technology (Beijing), Beijing 100083, China;[Xiaofen Wang] School of Materials Science and Engineering, Shanghai University, Shanghai 200444, China;[Qiongyu Zhou] School of Materials Science and Hydrogen Energy, Foshan University, Foshan 528000, China
通讯机构：
[Xiaofen Wang; Qiongyu Zhou] S;School of Materials Science and Engineering, Shanghai University, Shanghai 200444, China<&wdkj&>School of Materials Science and Hydrogen Energy, Foshan University, Foshan 528000, China
摘要：
The interfacial stability, particularly between lithium metal and the solid electrolyte, as a critical challenge in solid-state batteries leads to rapid lithium-dendrite growth and increased internal resistance. In this study, we tackled these issues by developing a stable interface between sulfide electrolytes Li5.5PS4.5Cl1.5 (LPSCl) and the metallic lithium anode, using a polyethylene oxide (PEO) layer integrated with Li-ion conducting oxide electrolyte Li1.3Al0.3Ti1.7(PO4)3 (LATP). The uniform distribution of LATP within the PEO matrix through a simple stirring process enhanced the mechanical strength of the PEO interlayer and minimizes both the interfacial reactions and lithium dendrite formation. A Li/Li symmetric cell incorporating this LATP-integrated layer exhibited a low interfacial resistance, ensuring stable cycling for 2800 h at a current density of 0.2 mA cm−2 at 60 °C.
摘要：
Sb-based materials exhibit considerable potential for sodium-ion storage owing to their high theoretical capacities. However, the bulk properties of Sb-based materials always result in poor cycling and rate performances. To overcome these issues, pyridine-regulated Sb@InSbS3 ultrafine nanoplates loaded on reduced graphene oxides (Sb@InSbS3@rGO) were designed and synthesized. During the synthesis process, pyridine was initially adopted to coordinate with In3+, and uniformly dispersed In2S3 ultrafine nanoplates on reduced graphene oxide were generated after sulfidation. Next, partial In3+ was exchanged with Sb3+, and Sb@InSbS3@rGO was obtained by using the subsequent annealing method. The unique structure of Sb@InSbS3@rGO effectively shortened the transfer path of sodium ions and electrons and provided a high pseudocapacitance. As the anode in sodium-ion batteries, the Sb@InSbS3@rGO electrode demonstrated a significantly higher reversible capacity, better stability (445 mAh<middle dot>g(-1) at 0.1 A<middle dot>g(-1) after 200 cycles and 212 mAh<middle dot>g(-1) at 2 A<middle dot>g(-1) after 1200 cycles), and superior rate (210 mAh<middle dot>g(-1) at 6.4 A<middle dot>g(-1)) than the electrode without pyridine (355 mAh<middle dot>g(-1) at 0.1 A<middle dot>g(-1) after 55 cycles and 109 mAh<middle dot>g(-1) at 2 A<middle dot>g(-1) after 770 cycles). Furthermore, full cells were assembled by using the Sb@InSbS3@rGO as anode and Na3V2(PO4)(3) as cathode, which demonstrated good cycling and rate performances and exhibited promising application prospects. These results indicate that adjusting the microstructure of electrode materials through coordination balance is A<middle dot>good strategy for obtaining high-capacity, high-rate, and long-cycle sodium storage performances.
通讯机构：
[Sun, DL ] C;Cent South Univ Forestry & Technol, Coll Mat Sci & Engn, Changsha 410004, Hunan, Peoples R China.
摘要：
Bamboo is an environmentally friendly building structural material. This work investigated the cavity structural characteristics and physical and mechanical properties of honeycomb sandwiches and natural bamboo in the longitudinal direction. The effective elastic parameters of periodically arranged hexagonal bamboo honeycomb cells under in-plane and out-of-plane loads were modeled using analytical and numerical approaches. Then, the effective elastic parameter model of bamboo honeycomb cells was validated by experiments and finite element analysis. The average errors between the calculated and experimental equivalent modulus of elasticity, Poisson's ratio, and shear modulus in the three principal axis directions were 7.43, 4.37, and 8.68%, respectively. The average relativities between the model values of the elastic parameters of the bamboo honeycomb cell and the simulation results in the three directions were 5.46, 5.40, and 6.12%, respectively. The experimental and finite element analysis showed that the constructed effective elastic parameter model of the bamboo honeycomb cell better reflected the state of the bamboo core when subjected to force. This study provides insights for further research on the mechanical properties of bamboo materials and their application in bamboo-based lightweight and high-strength sandwich structures.
作者机构：
[Zhaoyang Yu; Yuan Liu; Shanshan Chang] College of Materials Science and Engineering, Central South University of Forestry and Technology, Changsha 410004, China;Hunan Taohuajiang Bamboo Science & Technology Co. Ltd., Yiyang 413400, China;Astrum Innovations Limited, Wisdom Park, Country Garden, Changsha 410006, China;[Denis Rodrigue] Department of Chemical Engineering, Laval University, Quebec, G1V 0A6, Canada;[Xiaodong (Alice) Wang] Department of Wood and Forest Sciences, Laval University, Quebec, G1V 0A6, Canada
通讯机构：
[Jinbo Hu; Gonggang Liu; Shanshan Chang] C;College of Materials Science and Engineering, Central South University of Forestry and Technology, Changsha 410004, China<&wdkj&>Astrum Innovations Limited, Wisdom Park, Country Garden, Changsha 410006, China<&wdkj&>College of Materials Science and Engineering, Central South University of Forestry and Technology, Changsha 410004, China<&wdkj&>College of Materials Science and Engineering, Central South University of Forestry and Technology, Changsha 410004, China<&wdkj&>Hunan Taohuajiang Bamboo Science & Technology Co. Ltd., Yiyang 413400, China<&wdkj&>Astrum Innovations Limited, Wisdom Park, Country Garden, Changsha 410006, China
摘要：
Similar to transpiration, the formulation of interfacial solar evaporation has been designed to perform water treatment. The concept involves wood-based support (tree) with a graphene-based layer acting as leaves. To enhance light absorption and solar-thermal conversion capacity, a novel holly-leaf graphene (HLG) layer with an individual hollowed-out structure was engineered. The formation mechanism of this HLG was shown to be linked to the strong capillarity forces in the polyporous wood. By creating biomimetic leaves made of graphene, the light-to-heat conversion performance can be improved, while exhibiting substantially lower thermal conductivity (74 mW/m/K) than natural wood. Under solar irradiation, HLG/wood exhibits an outstanding evaporation rate of 1.96 kg/m2/h, with an impressive efficiency of 94%. A theoretical model of HLG/wood based on the thermal management capability was built to further confirm its structural superiority in facilitating photothermal conversion. Consequently, a bilayer evaporator based on HLG/wood has the potential to revolutionize water purification processes, including desalination of seawater, removal of heavy metal ions, and treatment of organic dye-contaminated wastewater.
通讯机构：
[Zhou, WR; Li, JZ ] B;[Li, C ] H;Beijing Forestry Univ, State Key Lab Efficient Prod Forest Resources, Beijing 100083, Peoples R China.;Beijing Forestry Univ, MOE Key Lab Wooden Mat Sci & Applicat, Beijing 100083, Peoples R China.;Beijing Forestry Univ, Beijing Key Lab Wood Sci & Engn, Beijing 100083, Peoples R China.
关键词：
epoxy polymeric siloxane nanoclusters;phenylboronicacid polymeric siloxane nanoclusters;hyperbranched;functional SM adhesive;toughness
摘要：
From an environmentally sustainable perspective, soybean meal (SM) adhesive presents an ideal alternative to petrochemical-based adhesives. Generally, strength and toughness are mutually exclusive for an adhesive. Hence, the creation of protein-based adhesives with high water-resistant strength of bonding, remarkable toughness, and multifunctionality remains a notable challenge. This study reports a dual hyperbranched siloxane nanocluster cross-linking strategy for creating SM-based adhesives with superior performance. In detail, synthesized hyperbranched epoxy siloxane nanocluster (ESN) and hyperbranched phenylboronic acid siloxane nanocluster (BPA@SN) were introduced into the SM matrix to establish a targeted cross-linking network between epoxy groups and protein chains as well as phenylboronic acid and polysaccharides. Meanwhile, the flexible Si-O segments within the hyperbranched siloxane facilitated energy dissipation, significantly boosting the adhesive toughness. After cross-linking modification, SM/ESN/BPA@SN-1 adhesive demonstrated outstanding dry bonding strength (2.04 +/- 0.18 MPa), water-resistant bonding strength (1.12 +/- 0.06 MPa), and toughness (18.5 +/- 4.02 kJ/m(3)). Moreover, the adhesive exhibited distinctly improved resistance to mold, thermal stability, and flame retardancy. Therefore, this new strategy of using functional hyperbranched siloxane nanoclusters and SM to design strong, tough, and multifunctional green and sustainable wood-based biomass adhesives provides new ideas for achieving green development.
作者：
Long Liang;Ting Wu;Kuizhong Shen;Guigan Fang;Yiqiang Wu;...
期刊：
Cellulose,2024年:1-14 ISSN：0969-0239
通讯作者：
Kuizhong Shen<&wdkj&>Guigan Fang
作者机构：
[Long Liang; Ting Wu; Kuizhong Shen; Guigan Fang; Shanming Han; Mengke Zhao] Institute of Chemical Industry of Forest Products, Chinese Academy of Forestry, Key Lab. of Biomass Energy and Material, Jiangsu Province;Key Lab. of Chemical Engineering of Forest Products, National Forestry and Grassland Administration, National Engineering Lab. for Biomass Chemical Utilization, Nanjing, China;State Key Laboratory of Pulp and Paper Engineering, South China University of Technology, Guangzhou, China;Co-Innovation Center of Efficient Processing and Utilization of Forest Resources, Nanjing Forestry University, Nanjing, China;[Yiqiang Wu] School of Materials Science and Engineering, Central South University of Forestry and Technology, Changsha, China
通讯机构：
[Kuizhong Shen; Guigan Fang] I;Institute of Chemical Industry of Forest Products, Chinese Academy of Forestry, Key Lab. of Biomass Energy and Material, Jiangsu Province;Key Lab. of Chemical Engineering of Forest Products, National Forestry and Grassland Administration, National Engineering Lab. for Biomass Chemical Utilization, Nanjing, China<&wdkj&>Co-Innovation Center of Efficient Processing and Utilization of Forest Resources, Nanjing Forestry University, Nanjing, China<&wdkj&>Institute of Chemical Industry of Forest Products, Chinese Academy of Forestry, Key Lab. of Biomass Energy and Material, Jiangsu Province;Key Lab. of Chemical Engineering of Forest Products, National Forestry and Grassland Administration, National Engineering Lab. for Biomass Chemical Utilization, Nanjing, China<&wdkj&>Co-Innovation Center of Efficient Processing and Utilization of Forest Resources, Nanjing Forestry University, Nanjing, China
摘要：
In chemi-mechanical pulping process, selective fiber separation strategies directly affect pulp property. The secondary wall (SW) separation strategy and middle lamella (ML) separation strategy expose more chemical structures from polysaccharides and lignin on the pulp fiber surface, respectively. Hydrogen-containing groups in these chemical structures generate characteristic spectral changes in response to water perturbation, which makes it possible for surface property analysis of pulp fibers based on near-infrared spectroscopy (NIR). Here, two-dimensional correlation spectroscopy (2DCOS) was obtained by the dynamic NIR spectra of pulp fibers with various equilibrium moisture content (EMC). The 2DCOS-NIR can provide richer structural and distributional information about hydrogen-containing groups which characterize the differences in surface chemical properties due to selective separation of the fibers. In synchronous map, the fibers separated at SW have significant water perturbation-induced spectral changes at the bands due to polysaccharides, and the fibers separated at ML have characteristic spectral changes at the bands due to hydrogen-containing groups from lignin. Furthermore, the 2DCOS spectral features can also accurately reflect the variation in the distribution of hydrogen bonding on the fiber surface under different refining conditions, which directly affects the strength properties of pulp fibers. The PLSR model based on 2DCOS spectral features exhibits excellent and robust predictive performance for internal bond strength with RMSEp of 7.17 J/m2, R of 0.9378 and RPD value of 4.11.
作者：
Su, Jiahui;Yang, Yadong;Wan, Caichao*;Li, Xingong;Chai, Yaling;...
期刊：
研究(英文),2024年7:0317 ISSN：2096-5168
通讯作者：
Wan, Caichao;Wu, YQ;Wan, CC
作者机构：
[Yang, Yadong; Li, Xingong; Wu, Yiqiang; Yuan, Jianzhong; Wan, Caichao; Chai, Huayun; Su, Jiahui; Wan, CC; Chai, Yaling] Cent South Univ Forestry & Technol, Coll Mat Sci & Engn, Changsha 410004, Peoples R China.;[Wan, Caichao; Wan, CC] Yihua Lifestyle Technol Co Ltd, Shantou 515834, Peoples R China.
通讯机构：
[Wu, YQ ; Wan, CC] C;[Wan, CC ] Y;Cent South Univ Forestry & Technol, Coll Mat Sci & Engn, Changsha 410004, Peoples R China.;Yihua Lifestyle Technol Co Ltd, Shantou 515834, Peoples R China.
摘要：
Silica glass, known for its brittleness, weight, and non-biodegradable nature, faces challenges in finding suitable alternatives. Transparent wood, made by infusing polymers into wood, shows promise but is hindered by limited availability of wood in China and fire risks associated with its use. This study explores the potential of utilizing bamboo, which has a shorter growth cycle, as a valuable resource for developing flame-retardant, smoke-suppressing, and superhydrophobic transparent bamboo. A 3-layered flame-retardant barrier, composed of a top silane layer, an intermediate layer of SiO(2) formed through hydrolysis-condensation of Na(2)SiO(3) on the surface, and an inner layer of Na(2)SiO(3), has been confirmed to be effective in reducing heat release, slowing flame spread, and inhibiting the release of combustible volatiles, toxic smoke, and CO. Compared to natural bamboo and other congeneric transparent products, the transparent bamboo displays remarkable superiority, with the majority of parameters being notably lower by an entire order of magnitude. It achieves a long ignition time of 116 s, low total heat release (0.7 MJ/m(2)), low total smoke production (0.063 m(2)), and low peak CO concentration (0.008 kg/kg). Moreover, when used as a substrate for perovskite solar cells, the transparent bamboo displays the potential to act as a light management layer, leading to a marked efficiency enhancement of 15.29%. The excellent features of transparent bamboo make it an enticing choice for future advancements in flame-retardant glasses and optical devices.
摘要：
Transformation of biomass wastes or residues into functional carbon materials is one of the main approaches to improve their added value and utilization rate. In this work, an example of discarded bamboo fibers was used to fabricate trimetallic functionalized 1D carbon composite with excellent electromagnetic wave (EW) absorption performances, via a simple solvothermal-carbonization method. When the thickness is below 2.0 mm, the composite has a minimum reflection loss (RLmin) of -61.6 dB and a specific RL value of -253 dB mg-1 mm-1, as well as an effective absorption band of 5.4 GHz at a low mass loading of 15 wt%. Such good performances are attributed to the synergetic effect of dielectric loss from bamboo fiber carbon and magnetic loss from Fe-Co-Ni interaction that greatly improved the impedance matching. In addition, bamboo fibers with rough surface could endow ample core-shell FeCoNi nanoparticles to uniform embed, which brings large number of interfaces and defects for the composite to enhance the electromagnetic loss capacity. This work provides a trimetallic compositing idea and a sustainable design approach for using biomass wastes to produce stable and efficient EW absorption materials.
作者机构：
[He, Mei; Wang, Hongjie; Guan, Jilun; Cheng, Fangchao; He, M] Guangxi Univ, Sch Resources Environm & Mat, State Key Lab Featured Met Mat & Life cycle Safety, Nanning 530004, Peoples R China.;[Cheng, Fangchao] Cent South Univ Forestry & Technol, Coll Mat Sci & Engn, Changsha 410004, Peoples R China.;[Zhu, YQ; Zhu, Yanqiu] Univ Exeter, Coll Engn Math & Phys Sci, Exeter EX4 4QF, England.
通讯机构：
[He, M; Cheng, FC ] G;[Zhu, YQ ] U;Guangxi Univ, Sch Resources Environm & Mat, State Key Lab Featured Met Mat & Life cycle Safety, Nanning 530004, Peoples R China.;Cent South Univ Forestry & Technol, Coll Mat Sci & Engn, Changsha 410004, Peoples R China.;Univ Exeter, Coll Engn Math & Phys Sci, Exeter EX4 4QF, England.
摘要：
Flexible sensors have promising applications in the fields of health monitoring and artificial intelligence, which have attracted much attention from researchers. However, the design and manufacture of sensors with multiple sensing functions (like simultaneously having both temperature and pressure sensing capabilities) still present a significant challenge. Here, an ionic thermoelectric sensor for synchronous temperature and pressure sensing was developed on the basis of a carbon microtubes (CMTs)/potassium chloride (KCl)/gelatin composite consisting of gelatin as the polymer matrix, CMTs as the conductive material and KCl as the ion source. The designed CMTs/KCl/gelatin composite with the good ductility (830%) and flexibility can achieve a Seebeck coefficient of 4 mV K-1 and a dual stimulus responsiveness to pressure and temperature. In addition, not only the movement of the human body (e.g., fingers, arms), but also the temperature difference between the human body and the environment, were able to be monitored by the designed CMTs/KCl/gelatin sensors. This study provides a novel strategy for the design and preparation of high-performance flexible sensors by utilizing ion-gel thermoelectric materials and promotes the research of temperature and pressure sensing technologies. Design of a CMTs/KCl/gelatin composite by a facile dissolution process using gelatin, CMTs and KCl for a wearable pressure and temperature sensor.
摘要：
Garnet solid state electrolytes (SSEs) have emerged as propitious candidates for solid-state batteries (SSBs) with exceptional ionic conductivity and excellent (electro)chemical stability. However, the Li|garnet interface contact deterioration still remains a major challenge resulting in Li dendrite propagation. Herein, a method is proposed to strengthen the adhesion of garnet SSE and Li by incorporating Sr3N2 into the Li metal. Density functional theory (DFT) calculations reveal that the interfacial formation energy of Li|garnet is decreased by the obtained Li-Sr-N (LSN) composite, which can enable a shift from poor contact to intimate bonding at the Li|garnet interface and a homogenous Li+ flux as well as electric field distribution. Simultaneously, the produced Li3N and LiSrN, which are known for their strong Li adsorption affinity and rapid Li+ transfer kinetics, actively govern the Li plating process. Thereby this rational design brings a notable reduction in interfacial impedance (4.5 omega cm2), along with the increased critical current density (1.3 mA cm-2) and enhanced cycle stability (1200 h at 0.3 mA cm-2). Furthermore, The LFP|garnet|LSN full cell has demonstrated remarkable cycling performance (95.9% capacity retention after 200 cycles at 1 C) and favorable rate capability (150.2 mAh g-1 at 0.1 C and 134.9 mAh g-1 at 1 C). The research provides a new sight into lithium modification that can restrain Li|garnet interface deterioration and lay the groundwork for future advancements in high-performance garnet- based SSBs. A simple tactic for fabricating a Li-Sr-N (LSN) composite anode tailored for solid-state batteries is proposed via the reaction between Li and Sr3N2. The interfacial contact with Li6.5La3Zr1.5Ta0.5O12 (LLZTO) pellet is greatly enhanced via LSN composite, enabling a homogeneous Li+ flux and electric field distribution during the Li plating/stripping process.image
