摘要：
Lightweight polymer composites promise incredible applications in aerospace, seaprobes, and medical apparatus. However, their performance is generally limited by a trade-off between mechanical strength and toughness. Herein, a crystallinity mitigating strategy driven by highly aligned bamboo macrofibers embedded in a polycaprolactone polyol (PCL) matrix for producing ultrastrong and tough lightweight polymer composites is proposed. The embedded bamboo macrofibers have oxygen-containing functional groups on the fiber surface, that can interact with functional groups (ester and hydroxyl groups) in the molecular chains of the PCL in the form of hydrogen bonds, thus preventing the aggregation of molecular chains and the crystallization of PCL, which ultimately leads to unprecedented toughness. Meanwhile, the bamboo macrofibres with intrinsically aligned microstructure, can enable effective stress transfer and dissipation, providing remarkable ultrahigh strength. As a result, the obtained lightweight polymer composite achieves ultrahigh mechanical strength (31.5 MPa) and superior toughness (21.7 MJ m-3) at an unprecedented low density (1.07 g cm-3), representing the state-of-the-art in reported lightweight polymers. Such lightweight polymer composite has the potential to greatly expedite the practical realization of artificial medical materials, including orthopedic instruments and joint prostheses. Herein, a crystallinity mitigation strategy driven by the embedding of highly aligned bamboo fibers into a polycaprolactone polyol (PCL) matrix is employed. At the same time, the bamboo fibers have an inherently aligned microstructure to effectively dissipate stress, and the resulting lightweight PCL composite achieves superior mechanical strength and excellent toughness at unmatched low density. image
期刊：
Journal of Cleaner Production,2024年434:140106 ISSN：0959-6526
通讯作者：
Qin, CR;Li, ZH
作者机构：
[Qin, Chengrong; Huang, Haibo] Guangxi Univ, Sch Light Ind & Food Engn, Nanning 530004, Peoples R China.;[Li, Zhihan; Li, ZH; Qing, Yan] Cent South Univ Forestry & Technol, Coll Mat Sci & Engn, Changsha 410004, Peoples R China.;[Hu, Can] Hunan Univ Technol, Hunan Key Lab Biomass Fiber Funct Mat, Zhuzhou 412007, Peoples R China.
通讯机构：
[Li, ZH ] C;[Qin, CR ] G;Guangxi Univ, Sch Light Ind & Food Engn, Nanning 530004, Peoples R China.;Cent South Univ Forestry & Technol, Coll Mat Sci & Engn, Changsha 410004, Peoples R China.
关键词：
Oily sludge;Amphipathic hemicellulose derivatives;Biosurfactants;Oil recovery;Kinetic model
摘要：
This study presents an improved sustainable approach to produce high-performance hemicellulose-based biosurfactants for environmentally friendly oily sludge remediation and oil components recovery. The amphipathic hemicellulose derivatives were prepared by hydrothermal extraction from renewable bamboo resources followed by rapid homogeneous esterification with alkenyl succinic anhydrides (C12–C18). The chemical structures of the prepared amphipathic hemicellulose derivatives were analyzed by FT-IR and NMR. The amphipathic hemicellulose derivatives with different hydrophobic chains were used to improve the separation and recovery of oil components from oily sludge in the thermal washing process. The hemicellulose modified with octadecenylsuccinic anhydride (HC-ODSA) exhibited the best oil recovery rate of 79.9%. The results of the interfacial activity, foaming, emulsification, and solubilization tests confirmed that the carbon chain length in the introduced hydrophobic groups exerted a substantial influence on the surface-active characteristics of the prepared amphipathic hemicellulose derivatives. Moreover, the results of desorption kinetics revealed that the amphiphilic hemicellulose molecules can reduce the interfacial tension between oil and water by adsorption at the interface and the petroleum hydrocarbons follow the pseudo-second-order desorption kinetic mode.
通讯机构：
[Wu, YQ; Tian, CH; Qing, Y ] C;Cent South Univ Forestry & Technol, Coll Mat Sci & Engn, Changsha 410004, Hunan, Peoples R China.
关键词：
carbon nanotube encapsulating;efficiency and durability;Fe doping;hierarchical wood substrate;high current density
摘要：
Precise morphology design and electronic structure regulation are critically significant to promote catalytic activity and stability for electrochemical hydrogen production at high current density. Herein, the carbon nanotube (CNT) encapsulated Fe-doped NiCoP nanoparticles is in-situ grown in hierarchical carbonized wood (NCF0.5P@CNT/CW) for water splitting. Coupling merits of porous carbonized wood (CW) substrate, CNT encapsulating and Fe doping, the NCF0.5P@CNT/CW features remarkable and durable electrocatalytic activity. The overpotentials of NCF0.5P@CNT/CW at 50 mA cm-2 mV and 205 mV for oxygen evolution reaction (OER) and hydrogen evolution reaction (HER) and features high current density of 800 mA cm-2 within 300 mV for both OER and HER. Moreover, NCF0.5P@CNT/CW displays outstanding overall water splitting performance (eta 50 = 1.62 V and eta 100 = 1.67 V), outperforming Pt/CRuO2 (eta 50 = 1.74 V), and can achieve the current density of 700 mA cm-2 at a lower cell voltage of 1.78 V. Overpotential is only 4.0 % decay after 120 h measurement at 50 mA cm-2. Density functional theory (DFT) calculations reveals Fe doping optimizes the binding energy and Gibbs free energy of intermediates, and regulates d-band center of NCF0.5P@CNT/CW. Such synergistic strategy of morphology manipulation and electronic structure optimization provides a spark for developing effective and robust bifunctional catalysts. The synergistic strategy of morphology manipulation and electronic structure optimization by encapsulating Fe-doped NiCoP into carbon nanotube (CNT) and in situ growing in hierarchical carbonized wood (CW) is employed to fabricate NCF0.5P@CNT/CW catalyst. The NCF0.5P@CNT/CW presents remarkable and durable performance for oxygen evolution reaction (OER), hydrogen evolution reaction (HER) and overall water splitting, which provides an avenue for the electrochemical hydrogen production at high current density.image
通讯机构：
[Wu, YQ; Tian, CH ] C;Cent South Univ Forestry & Technol, Coll Mat Sci & Engn, Changsha 410004, Peoples R China.
关键词：
typical softwood;typical hardwood;wood aerogel;nanofibril network;formation process
摘要：
The construction of networks within natural wood (NW) lumens to produce porous wood aerogels (WAs) with fascinating characteristics of being lightweight, flexible, and porous is significant for the high value-added utilization of wood. Nonetheless, how wood species affect the structure and properties of WAs has not been comprehensively investigated. Herein, typical softwood of fir and hardwoods of poplar and balsa are employed to fabricate WAs with abundant nanofibrillar networks using the method of lignin removal and nanofibril's in situ regeneration. Benefiting from the avoidance of xylem ray restriction and the exposure of the cellulose framework, hardwood has a stronger tendency to form nanofibrillar networks compared to softwood. Specifically, a larger and more evenly distributed network structure is displayed in the lumens of balsa WAs (WA-3) with a low density (59 kg m-3), a high porosity (96%), and high compressive properties (strain = 40%; maximum stress = 0.42 MPa; height retention = 100%) because of the unique structure and properties of WA-3. Comparatively, the specific surface area (SSA) exhibits 25-, 27-, and 34-fold increments in the cases of fir WAs (WA-1), poplar WAs (WA-2), and WA-3. The formation of nanofibrillar networks depends on the low-density and thin cell walls of hardwood. This work offers a foundation for investigating the formation mechanisms of nanonetworks and for expanding the potential applications of WAs.
期刊：
Industrial Crops and Products,2024年209:117944 ISSN：0926-6690
通讯作者：
Li, GY
作者机构：
[Chen, Yuan; Guo, Dengkang; Zhang, Yiyuan; Li, Gaiyun; Li, GY] Chinese Acad Forestry, Res Inst Wood Ind, 1 Dongxiaofu Xiangshan Rd, Beijing 100091, Peoples R China.;[Cao, Yuan] Chinese Acad Forestry, State Key Lab Tree Genet & Breeding, Beijing 100091, Peoples R China.;[Wu, Yiqiang; Qing, Yan] Cent South Univ Forestry & Technol, Sch Mat Sci & Engn, Changsha 410004, Hunan, Peoples R China.
通讯机构：
[Li, GY ] C;Chinese Acad Forestry, Res Inst Wood Ind, 1 Dongxiaofu Xiangshan Rd, Beijing 100091, Peoples R China.
关键词：
Bio-composites;Self-bonding;Particle size high strength;Eco-friendly
摘要：
Green and low-carbon bio-composites from wood fibers are in great demand in the further due to the global sustainable development. In this work, we successfully manufactured the fully bio-composites with excellent mechanical properties and improved water resistance using the dialdehyde wood fibers as the “glue” and untreated poplar wood fibers with lower particle size. The high reactive aldehyde groups provided internal chemical connection between fiber compositions and uniform size offered tightly connected structure and physical winding, which were synergistically contributed to superior performances of self-bonding bio-composites. The self-adhesive bio-composites owned outstanding flexural strength (105.2 MPa), tensile strength (35.6 MPa), internal bond strength (5.1 MPa), and hardness (0.3 GPa), better than most of the reported non-adhesive biomass materials. An innovative hydrobromic acid destruction method was used to prove the self-assembly mechanism and contributions. Both of the direct characterization and reverse destruction illustrated the covalent and hydrogen bond synergistic self-adhesive contribution of dialdehyde oxidation and homogenization. The self-bonding bio-composites have the potential to be applied to high strength outdoor household materials and structural buildings, which corresponds with the notions of carbon storage, eco-friendly, and degradation.
期刊：
Green Chemistry,2024年26(6):3356-3367 ISSN：1463-9262
通讯作者：
Wu, YQ;Jiang, Jianchun;Wang, K
作者机构：
[Li, Zhaoshuang; Liu, Chao; Wu, Zhiping; Qing, Yan; Wu, Yiqiang] Cent South Univ Forestry & Technol, Sch Mat Sci & Engn, Changsha 410004, Peoples R China.;[Jiang, Jianchun; Liu, Chao; Cai, Tingting; Wang, Kui; Wang, K; Jiang, JC] Inst Chem Ind Forest Prod, Chinese Acad Forestry, Key Lab Biomass Energy & Mat Jiangsu Prov, Natl Engn Lab Biomass Chem Utilizat, Nanjing 210042, Jiangsu, Peoples R China.;[Chen, Yuwei] Yancheng Inst Technol, Sch Automot Engn, Yancheng 224051, Peoples R China.;[Zhang, Xiaolei; Jia, Shuya] Univ Strathclyde, Dept Chem & Proc Engn, Glasgow City G1 1XJ, Scotland.
通讯机构：
[Wu, YQ ] C;[Wang, K ; Jiang, JC] I;Cent South Univ Forestry & Technol, Sch Mat Sci & Engn, Changsha 410004, Peoples R China.;Inst Chem Ind Forest Prod, Chinese Acad Forestry, Key Lab Biomass Energy & Mat Jiangsu Prov, Natl Engn Lab Biomass Chem Utilizat, Nanjing 210042, Jiangsu, Peoples R China.
摘要：
Solvents play a critical role in the lignin hydrogenation process. However, elucidating the role of solvents in lignin hydrogenation solely through experimental methods presents considerable challenges. The present report integrates experimental results, quantum chemical calculations, and molecular dynamics simulations to study the effect of solvents on the hydrogenation of lignin on Ru/C to produce phenolic compounds. Solvents not only disperse the substrate and promote the mass transfer process in the hydrogenation reaction, but also significantly affect the hydrogenation reaction rate of lignin. We show that the hydrogenation reaction rates of lignin in different solvents differ by an order of magnitude (isopropanol > methanol > water > γ-valerolactone > tetrahydrofuran). By innovatively combining quantum chemical calculations with experimental results, it was reported for the first time that solvent affects the free energy barrier by regulating the properties of the transition state (C–O bond strength), thereby affecting the lignin hydrogenolysis reaction rate. Based on molecular dynamics simulations, this study investigated the interaction between lignin and various solvent molecules. The research results confirmed that solvent molecules regulate the solvent shell on the surface of lignin, thereby influencing the mechanism of the hydrogenation reaction process.
摘要：
Developing multifunctional materials with green, lasting, and simple preparation processes is a hot topic and challenge in solving the problem of oil spill contamination. A multifunctionalized superhydrophobic coating was generated via cross-linking 3-(Trimethoxysilyl) propyl acrylate with Polyethyleneimine in a multifunctional covalent manner and modifying the cotton fabric surface with silylated modified rosin acid (RA-Si) as well as TiO2 nanoparticles. The coated samples had remarkable superhydrophobicity with self-cleaning as well as stain resistance. With bactericidal rates of 97.73 % and 98.36 %, respectively, the coated samples effectively inhibited the formation of biofilms and showed high antimicrobial performance for both Staphylococcus aureus and Escherichia coli. Meanwhile, the coated samples showed outstanding oil absorption and separation of the oilwater mixture. Both water-in-oil and oil-in-water stable emulsions would be effectively separated out of the coated samples after demulsifying. Additionally, the water droplet contact angle of the coated samples was maintained at approximately 150.0 degrees after mechanical and chemical testing. It was noteworthy that the coated samples still exhibited satisfactory separation for stabilizing oil/water emulsions after mechanical wear and chemical corrosion treatment, indicating their excellent mechanical durability. The prepared multifunctional RATiO2 superhydrophobic coating has promising applications in oil-containing wastewater treatment and environmental remediation.
作者机构：
[Wu, Yiqiang; Deng, Songlin; Qing, Yan; Jia, Shanshan] Cent South Univ Forestry & Technol, Coll Mat Sci & Engn, Changsha 410004, Peoples R China.;[Jia, Shanshan] Sichuan Agr Univ, Coll Forestry, Chengdu 611130, Peoples R China.
通讯机构：
[Yiqiang Wu; Yan Qing] C;College of Materials Science and Engineering, Central South University of Forestry and Technology, Changsha, 410004, PR China<&wdkj&>College of Materials Science and Engineering, Central South University of Forestry and Technology, Changsha, 410004, PR China
摘要：
Inspired by the biomaterial nacre, we report a versatile and facile strategy to rugged, flame retardant super-hydrophobic materials by embedding a nacre-like montmorillonite (MMT) based gas barrier layer into hierar-chical epoxy-resins. The well-aligned MMT layer imparted excellent oxygen and water barrier properties that rendered the coating surface water repellent yet protected the substrate materials from fire by suppressing heat and oxygen transfer. The hierarchical epoxy not only provided the robust superhydrophobic structure but offered strong adhesion to MMT layer. After application of this coating to a flammable sponge, it demonstrated super-hydrophobicity with a contact angle of similar to 153 degrees. Furthermore, the material was rugged, resisting 1200 compression cycles and induced marked flame retardancy. The coated sponge delayed ignition (689% delay in ignition time) and promoted significant flame extinguishing property, compared with the uncoated material (demonstrated by LOI, CONE combustion, and fire scenario tests). Owing to its robustness and multi-functionality, the coated sponge was able to efficiently separate oil from multi-environments including strong corrosive, icy, boiling or vibrating mixtures. Additionally, the versatile application to wood, cotton, textile and other lignocellulosic substrates has been verified. This research opens up a new direction for durable waterproof and fireproof materials.
通讯机构：
[Qing, Y ] C;Cent South Univ Forestry & Technol, Coll Mat Sci & Engn, Changsha 410004, Peoples R China.
关键词：
wood-based sensor;colorimetric sensor;formaldehyde;poplar;visible color change
摘要：
Indoor formaldehyde (FA, HCHO) contamination is currently one of the most significant environmental concerns in daily life, making it vital to detect FA efficiently. Colorimetric FA detection is a fast, real-time method with results visible to the naked eye. However, most colorimetric FA sensors on the market have complex and expensive base materials. In this work, different sections were prepared as colorimetric sensor substrates according to the anisotropy of natural poplar trees. The response characteristics of FA on the different sections were compared, showing that the longitudinal section sensor senses theFA concentration 15 times lower than the concentration of FA that the cross-section sensor can sense. Additionally, the longitudinal channel wall in the wood hierarchical structure has a large concave surface area to facilitate the attachment of sensing materials and enhance FA detection. The fabricated longitudinal section sensor exhibits an ultralow FA detection limit of 50 ppb within 5 min, which is much lower than the WHO threshold level (80 ppb) and other colorimetric techniques. Moreover, the constructed sensor shows high FA selectivity on experimentation with typical indoor contaminants. This sensitive, highly selective, and fast-responding colorimetric strip is cost-effective for determining gaseous FA.
作者：
Jia, Shanshan;Deng, Songlin;Lu, Yao;Wu, Yiqiang;Qing, Yan
期刊：
Chemical Engineering Journal,2023年475:146240 ISSN：1385-8947
通讯作者：
Yiqiang Wu<&wdkj&>Yan Qing
作者机构：
[Deng, Songlin; Wu, Yiqiang; Qing, Yan] College of Materials Science and Engineering, Central South University of Forestry and Technology, Changsha 410004, China;College of Forestry, Sichuan Agricultural University, Chengdu 611130, China;[Lu, Yao] Department of Chemistry, School of Physical and Chemical Sciences, Queen Mary University of London, London E1 4NS, UK;[Jia, Shanshan] College of Materials Science and Engineering, Central South University of Forestry and Technology, Changsha 410004, China<&wdkj&>College of Forestry, Sichuan Agricultural University, Chengdu 611130, China
通讯机构：
[Yiqiang Wu; Yan Qing] C;College of Materials Science and Engineering, Central South University of Forestry and Technology, Changsha 410004, China
摘要：
As a new star of low carbon footprint material, wood with both superhydrophobic robustness and flame retardancy highly boosts its applications in various fields. However, these individual functionalities have conflicting requirements on the interfacial or bulky properties of its surface coating, especially in flammable organic adhesives (such as epoxy resin (EP) and polydimethylsiloxane (PDMS)) and nanoparticle systems. Therefore, breaking the conflicting requirement on adhesives is a crucial and challenging issue for achieving superhydrophobic robustness without impairing flame retardancy. In this work, a structure of three-dimensional (3D) flower-like hydrotalcite (HT) clusters isolated by hierarchical pores was proposed to resolve the conflicting demand. Such kind of structure was fabricated through a one-step thermally-driven method using HT, EP and perfluorooctyl triethoxysilane (PFOES). Benefitting from the release of gaseous ethanol from the inside of wood and its circulation flow among EP and HT during thermally driven process, the HT particles were bonded with small amount of EP and assembled as robust 3D flower-like HT clusters isolated by micro/nano sized pores, rather than embedded in a thick EP coating. This structure significantly reduced the use of flammable EP and increased the loading of flame retardant HT. Therefore, wood with boosting flame retardancy without compromising its own superhydrophobic robustness was achieved (herein named as HT/EP/PFOES wood). Cone calorimetry test showed that the HT/EP/PFOES wood had a 49.33% reduction in the peak of heat release rate (HRR) and a 34.51% reduction of total heat release (THR), which outperformed most of the existing flame retardants and superhydrophobic lignin-cellulosic materials. Meanwhile, its superhydrophobic robustness was not impaired. Together with a facile one-step thermally driven fabrication process, this structure of 3D flower-like HT clusters provided a new insight into fire retardant and robust superhydrophobic wood.
摘要：
Cellulose nanofiber (CNF) aerogels hold considerable potential in wearable devices as pressure sensors and flexible electrochemical energy storage. However, the undirectional assembly of CNFs results in poor mechanical performance, which limits their application in structural engineering. In this study, we propose an anisotropic aerogel with both elastic and conductive properties inspired by the micro-nanostructure of natural wood. One-dimensional TEMPO cellulose nanofibers (TOCNF) were utilized as structural building blocks, while two-dimensional reduced graphene oxide (rGO) served as the electron transfer platform, owing to their high mechanical strength. The directionally aligned tubular structure composed of multilayered sheets was formed through rapid unidirectional freezing and subsequent steam heating reduction. These structures efficiently transferred stress throughout the porous skeleton, resulting in TOCNF-rGO aerogels with high compressibility and excellent fatigue resistance (2000cycles at 60% strain). The aerogel also exhibited high sensitivity, wide detection range, relatively fast response, and excellent compression cycle stability, making it suitable for accurately detecting various human biological and motion signals. Additionally, TOCNF-rGO can be assembled into a flexible all-solid-state symmetric supercapacitor that delivers excellent electrochemical performance. It is expected that this biomass-derived aerogel will be a versatile material for flexible electronic devices for energy conversion and storage.
通讯机构：
[Yan Qing; Yiqiang Wu] A;Authors to whom correspondence should be addressed.<&wdkj&>College of Materials Science and Engineering, Central South University of Forestry and Technology, Changsha 410004, China
摘要：
Photocatalytic oxidation is considered one of the most effective ways to remove formaldehyde from indoor air. However, the use of powder photocatalysts is limited by their low adsorption capacity and strong aggregation tendency. Hence, there is a need for a composite material with good cycling stability and high degradation efficiency. In the present study, a unique wood-based composite is produced by arranging Cu-TiO2 nanoparticles on porous structured wood. The porous structure of wood can adsorb formaldehyde, and the abundant functional groups on the surface can act as a reaction platform for anchoring the Cu-TiO2 nanoparticles. Cu doping facilitates electron interaction between TiO2 and Cu, promotes the transfer of charge carriers, lowers the electron-hole recombination rate, and improves the photocatalytic degradation efficiency of formaldehyde. The photocatalytic efficiency of the wood-based composites was highest (85.59%) when the n(Cu)/n(Ti) ratio was 7%. After nine cycles, the wood composites still had a high degradation rate, indicating good recyclability. Overall, this wood composite is an eco-friendly and promising material for indoor air filtration.
作者机构：
[Wu, Yiqiang; Zhang, Zhen; Li, Lei; Qing, Yan] Cent South Univ Forestry & Technol, Coll Mat Sci & Engn, Hunan Prov Collaborat Innovat Ctr High Efficiency, Changsha 410004, Peoples R China.;[Zhang, Zhen] Northeast Forestry Univ, Forestry Engn, Harbin 150040, Peoples R China.;[Wang, Delong] Datang Hubei New Energy Div, Huanggang 438000, Peoples R China.
通讯机构：
[Yiqiang Wu] H;Hunan Provincial Collaborative Innovation Center for High-Efficiency Utilization of Wood and Bamboo Resources, College of Materials Science and Engineering, Central South University of Forestry and Technology, Changsha 410004, China<&wdkj&>Author to whom correspondence should be addressed.
摘要：
Developing highly porous and conductive carbon electrodes is crucial for high-performance electrochemical double-layer capacitors. We provide a method for preparing supercapacitor electrode materials using zeolitic imidazolate framework-8 (ZIF-8)-coated wood fibers. The material has high nitrogen (N)-doping content and a specific surface area of 593.52 m(2) g(-1). When used as a supercapacitor electrode, the composite exhibits a high specific capacitance of 270.74 F g(-1), with an excellent capacitance retention rate of 98.4% after 10,000 cycles. The symmetrical supercapacitors (SSCs) with two carbon fiber electrodes (CWFZ2) showed a high power density of 2272.73 W kg(-1) (at an energy density of 2.46 W h kg(-1)) and an energy density of 4.15 Wh kg(-1) (at a power density of 113.64 W kg(-1)). Moreover, the SSCs maintained 81.21% of the initial capacitance after 10,000 cycles at a current density of 10 A g(-1), which proves that the SSCs have good cycle stability. The excellent capacitance performance is primarily attributed to the high conductivity and N source provided by the zeolite imidazole framework. Because of this carbon material's unique structural features and N-doping, our obtained CWFZ2 electrode material could be a candidate for high-performance supercapacitor electrode materials.
通讯机构：
[Tian, CH; Wu, YQ ] C;Cent South Univ Forestry & Technol, Sch Mat Sci & Engn, Changsha 410004, Peoples R China.
关键词：
Manipulating porous structure;Cr doping;Exposing active sites;High performance;Excellent durability
摘要：
Oxygen evolution reaction (OER) is considered the bottleneck that restricting the pace of electrocatalytic hydrogen production. Modulating structure and heterogeneous doping are essential approaches to effectively promote the electrocatalytic efficiency and stability. Herein, three-dimensional (3D) porous Cr doped NiFeP nanoparticles encapsulated in cellulose nanofibrils (CNF) carbon architecture (Cr–NiFeP/NC) with high-efficiency and durable OER performance was constructed. CNF played crucial role on the construction of 3D porous framework and promoting the OER performance significantly. Benefiting from the 3D porous structure, high specific surface area and exposed abundant active sites, the Cr–NiFeP/NC electrocatalyst displayed excellent OER performance, which the overpotential to deliver the current density of 10 mA cm−2 was only 249 mV with a Tafel slope of 51.2 mV dec−1 in 1.0 M KOH, outperforming the RuO2 and other reported electrocatalysts remarkably. In addition, the Cr–NiFeP/NC electrocatalyst exhibited outstanding stability, which the overpotential was only increased by 2.5% after 48 h chronopotential measurement to deliver a current density of 10 mA cm−2 with stable morphology and structure. This work demonstrated an integrated strategy of Cr doping and 3D porous structure modulating employed CNF as skeleton for the efficient and durable OER performance, providing a spark for hydrogen production by water splitting.
摘要：
Biomass-derived carbons from natural fiber have attracted great attention as promising anode material in lithium/sodium-ion batteries for their sustainability and hollow structure. However, their poor electrochemical stability and slow kinetics restrict their practical application. Herein, we prepare nitrogen-doped carbonized porous wood fiber (N-PCF) through an in-situ sacrificial template-assisted hydrothermal strategy, using graphitic carbon nitride (g-C3N4) as a template as well as a nitrogen source. The hydrothermal process contributes to enhancing the specific surface area of wood fiber and provides favorable conditions for subsequent doping. It was shown that the optimized N-PCF-2 with a 10:2 mass ratio of wood fiber and g-C3N4 template displayed a large specific surface area, suitable doping heteroatom configurations, and an abundant structure defect, providing excellent electrochemical performance. The N-PCF-2 delivered a high specific capacity of 434 mAh g-1 at 200 mA g-1 after 300 cycles in lithium-ion batteries and 266 mAh g-1 at 200 mA g-1 after 300 cycles in sodium-ion batteries. This work demonstrates that the employment of wood fiber-derived carbon as potential anodes of lithium/sodium-ion batteries will significantly impact the field of energy storage.
