摘要：
Nanocrystalline cellulose (NCC) preparation in an integrated fractionation manner is expected to solve the problems of low yield and environmental impact in the traditional process. An integrated fractionation strategy for NCC production from wood was developed through catalytic biomass fractionation, the partial dissolution of cellulose-rich materials (CRMs) in aqueous tetrabutylphosphonium hydroxide, and short-term ultrasonication. The presented process could tolerate a high CRM lignin content of 21.2 wt % and provide a high NCC yield of 76.6 wt % (34.3 wt % of the original biomass). The increase in the CRM lignin content decreased the NCC yield, facilitated the crystal transition of NCC from cellulose I to cellulose II, and showed no apparent effects on the NCC morphology. A partial/selective dissolution mechanism is proposed for the presented strategy. This study provided a promising efficient fractionation-based method toward comprehensive and high-value utilization of lignocellulosic biomass through effective delignification and high-yield NCC production.
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.
作者机构：
[Li, Xingong; Wei, Song; Wu, Yiqiang; Cheng, Wenjie; Wan, Caichao; Chai, Huayun; Su, Jiahui; Wan, CC] Cent South Univ Forestry & Technol, Coll Mat Sci & Engn, Changsha 410004, Peoples R China.
通讯机构：
[Wu, YQ ; Wan, CC] C;Cent South Univ Forestry & Technol, Coll Mat Sci & Engn, Changsha 410004, Peoples R China.
摘要：
Traditional electrode materials still face vital challenges of few active sites, low porosity, complex synthesis process, and low specific capacitance. Herein, N-doped and 3D hierarchical porous graphene nanofoam (N-GNF) is created on car-bon fibers (CFs) by employing a facile, fast, and environmentally friendly strategy of N-2 plasma activation. After an appropriated N-2 plasma activation, the graphene nanosheets (GNSs) synthesized by Ar/CH4 plasma deposition transform into N-GNF successfully. N doping donates rich active sites and increases the hydro-philia, while hierarchical nanoarchitecture exposes an enlarged effective contact area at the interface between electrode and electrolyte and affords sufficient space for accommodating more electrolytes. The as-assembled flexible N-GNF@CFs//Zn NSs@CFs Zn ion capacitor delivered a high energy density of 105.2 Wh kg(-1) at 378.6 W kg(-1) and initial capacity retention of 87.9% at the current of 2 A g(-1) after a long cycle of 10,000.
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.
期刊：
Green Chemistry,2023年25(9):3322-3353 ISSN：1463-9262
通讯作者：
Yiqiang Wu
作者机构：
[Wei, Song; Wu, Yiqiang; Wan, Caichao] Cent South Univ Forestry & Technol, Coll Mat Sci & Engn, Changsha 410004, Peoples R China.
通讯机构：
[Yiqiang Wu] C;College of Materials Science and Engineering, Central South University of Forestry and Technology, Changsha 410004, PR China
摘要：
In the last few years, renewable, inexpensive, biocompatible, and biodegradable wood and lignocellulose materials have triggered considerable research interest for application in various functional devices. However, there is still a lack of a new perspective to deeply understand the structure–property–function relationships of micro-/nanostructures and components of natural wood, so as to explore the potential of wood assembly of nano-energy materials with different dimensions. Herein, the recent progresses in the design and construction of free-standing supercapacitor (SC) electrodes containing wood-derived materials are reviewed. We begin with an illustrated introduction to the hierarchical structure and characteristics of natural wood with a “top–down” view, which includes the cell walls, cellulose microfibers, nanocellulose, and cellulose supramolecules. Next, the fabrication, structure, and properties of lignocellulose are highlighted. We focus on the structure–property–function relationships between the hierarchical micro- and nanoscale structure of wood and electroactive materials. The focus then turns to a summary of the recent advances in wood-based free-standing SC electrodes with a unique point that is ever out of the spotlight, including one-dimensional integrated fibers, two-dimensional flexible films/papers, three-dimensional porous hydrogels/aerogels, and ultra-thick electrodes. Finally, we put forward our perspectives on the challenges to further promoting the development of this emerging field in the future.
作者：
Kui Li;Yingfeng Zuo;Long Zheng;Huifen Wang;Yiqiang Wu*
期刊：
Industrial Crops and Products,2023年194:116344 ISSN：0926-6690
通讯作者：
Yiqiang Wu
作者机构：
[Kui Li; Huifen Wang] Changsha Hanchuang New Material Technology Company Limited, Changsha, Hunan 410004, PR China;[Yingfeng Zuo; Long Zheng; Yiqiang Wu] College of Materials Science and Engineering, Central South University of Forestry and Technology, Changsha, Hunan 410004, PR China
通讯机构：
[Yiqiang Wu] C;College of Materials Science and Engineering, Central South University of Forestry and Technology, Changsha, Hunan 410004, PR China
期刊：
Chemical Engineering Journal,2023年457:141309 ISSN：1385-8947
通讯作者：
Xiong, Fuquan(xiongfuquan@126.com)
作者机构：
[Ma, Bole; Wu, Yiqiang; Xiong, Fuquan; Wang, Hang; Qing, Yan] Cent South Univ Forestry & Technol, Coll Mat Sci & Engn, Changsha 410004, Peoples R China.;[Chu, Fuxiang] Chinese Acad Forestry, Res Inst Wood Ind, Beijing 100091, Peoples R China.
通讯机构：
[Fuquan Xiong; Yiqiang Wu] C;College of Materials Science and Engineering, Central South University of Forestry and Technology, Changsha 410004, China
作者机构：
[Ma, Bole; Wu, Yiqiang; Xiong, Fuquan; Wang, Hang; Yang, Jiamei; Guo, Feng; Qing, Yan] Cent South Univ Forestry & Technol, Coll Mat Sci & Engn, Changsha 410004, Peoples R China.;[Chu, Fuxiang] Chinese Acad Forestry, Res Inst Wood Ind, Beijing 100091, Peoples R China.;[Wu, Yiqiang; Xiong, Fuquan] 498 Shaoshan South Rd, Changsha, Peoples R China.
通讯机构：
[Fuquan Xiong; Yiqiang Wu] C;College of Materials Science and Engineering, Central South University of Forestry and Technology, Changsha 410004, China
期刊：
Chemical Engineering Journal,2023年456:141117 ISSN：1385-8947
通讯作者：
Xia, Liaoyuan(xly1516@126.com)
作者机构：
[Deng, Ashen; Li, Xingong; Wu, Yiqiang; Liao, Yu; Xia, Liaoyuan; Liu, Yujie; Qing, Yan; Gao, Zhifei] Cent South Univ Forestry & Technol, Coll Mat Sci & Engn, Changsha 410018, Peoples R China.;[Xia, Liaoyuan; Gao, Zhifei] Cent South Univ Forestry & Technol, Hunan Prov Key Lab Mat Surface & Interface Sci & T, Changsha 410018, Peoples R China.;[Wang, Yun] Hunan Post & Telecommun Coll, Changsha 410015, Peoples R China.
通讯机构：
[Liaoyuan Xia; Yiqiang Wu] C;College of Material Science and Engineering, Central South University of Forestry and Technology, Changsha 410018, PR China<&wdkj&>College of Material Science and Engineering, Central South University of Forestry and Technology, Changsha 410018, PR China<&wdkj&>Hunan Province Key Laboratory of Materials Surface & Interface Science and Technology, Central South University of Forestry and Technology, Changsha 410018, PR China
通讯机构：
[Mizi Fan; Yiqiang Wu; Weisheng Sun; Xi Guo] C;College of Engineering, Design and Physical Sciences, Brunel University London, UK<&wdkj&>College of Materials Science and Technology, Central South University of Forestry and Technology, Changsha, China<&wdkj&>College of Chemistry and Materials Engineering, Zhejiang Agricultural and Forestry University, Hangzhou, China
关键词：
Biomimetic bone tissue structure;Cellulose nanofibril;High strength;Phase change materials;Thermal energy storage
摘要：
High-strength, dimensionally-stable, moisture-absorbing, and heat-insulating materials are critical for ensuring the safety of building structures and human comfort. As a natural moisture-adjusting and heat-insulating material, wood is widely used in buildings, but its low strength and flammability pose safety hazards. This paper reports a simple method to construct an organic-inorganic hyperbranched structure in poplar wood (WSi-Al-EP). The bending and compressive strength of WSi-Al-EP reached 103.50 MPa and 80.41 MPa, respectively. This composite wood material exhibited high strength and stable performance, and it also improved the shortcomings of traditional inorganic-modified materials such as unstable sizes and the loss of modifiers. Moreover, the material did not burn in a long-term high-temperature flame, indicating its heat and combustion resistance, and showing that it can be used in wooden building structures.
通讯机构：
[Yan Qing; Han Xu] C;College of Materials Science and Engineering, Central South University of Forestry and Technology, Changsha 410004, PR China
摘要：
Molybdenum carbide has been demonstrated as a promising alternative to noble metal catalysts toward green and efficient hydrogen conversion. However, the suboptimal hydrogen adsorption free energy ( increment GH*) and complex carbon reduction procedures remain crucial challenges. Herein, a gas-phase reaction approach based on the in-situ decomposition of hemicellulose and cellulose from natural wood was proposed for the design of highly active Mo2C nanoparticles that are tightly rooted into the hierarchical N-doped carbonized wood (denoted as Mo2C/N-CW). As expected, the Mo2C/N-CW catalyst exhibited low hydrogen evolution reaction (HER) overpotential (98 mV at 50 mA cm-2) and outstanding long-term durability. The theoretical findings show that the conjunction between Mo2C and N-CW can modulate the increment GH* to the desired level, thereby improving the HER activity. The proposed approach enabled by the decompositions from natural biomass to construct high-performance electrocatalysts opens a novel perspective for the efficient pro-duction of hydrogen energy.(c) 2022 Elsevier B.V. All rights reserved.
摘要：
Poplar wood, which is primarily used to manufacture wood-based panels, furniture, and paper, is a fast-growing plantation wood that is produced with high yields; however, its poor mechanical properties and perishability limit its application. Herein, we propose a method that enables sil-ica-alumina sol to penetrate wood smoothly. In this method, silica-alumina sol is added into an ether polymer by blending, and the mixture is completely stirred until hybridization. The ether polymer introduces the silica-alumina sol into wood via pressure impregnation. Poplar wood treated with this hybrid material has excellent mechanical properties; the maximum bending strength and modulus of elasticity are 112.9 MPa and 16.89 GPa, respectively, and the compressive strength along the grain is 111.5 MPa. Moreover, the treated poplar wood exhibits decay resistance and flame retardancy properties. After 12 weeks of decay resistance testing, the average mass loss is 8.35%-18.52% (that of untreated wood is 32.33%-62.06%). The treated wood exhibits 40.5% and 52.4% smaller total heat release and total smoke production, respec-tively, than the untreated wood. This method incorporates silica-alumina sol in wood via physical filling and chemical bonding, thereby improving the mechanical and flame retardancy properties of wood as an outdoor building material.
摘要：
Carbon materials are effective substitutes for Pt counter electrodes (CEs) in dye-sensitized solar cells (DSSCs). However, many of these materials, such as carbon nanotubes and graphene, are expensive and require complex preparation process. Herein, waste lignin, recycled from hazardous black liquors, is used to create oxygen-nitrogen-sulfur codoped carbon microspheres for use in DSSC CEs through the facile process of low-temperature preoxidation and high-temperature self-activation. The large number of ester bonds formed by preoxidation increase the degree of cross-linking of the lignin chains, leading to the formation of highly disordered carbon with ample defect sites during pyrolysis. The presence of organic O/N/S components in the waste lignin results in high O/N/S doping of the pyrolysed carbon, which increases the electrolyte ion adsorption and accelerates the electron transfer at the CE/electrolyte interface, as confirmed by density functional theory (DFT) calculations. The presence of inorganic impurities enables the construction of a hierarchical micropore-rich carbon structure through the etching effect during self-activation, which can provide abundant catalytically active sites for the reversible adsorption/desorption of electrolyte ions. Under these synergistic effects, the DSSCs that use this novel carbon CE achieve a quite high power-conversion efficiency of 9.22%. To the best of our knowl-edge, the value is a new record reported so far for biomass-carbon-based DSSCs. Crown Copyright & COPY; 2023 Science Press and Dalian Institute of Chemical Physics, Chinese Academy of Sciences. Published by ELSEVIER B.V. and Science Press. All rights reserved.
