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Nickel-copper alloying arrays realizing efficient co-electrosynthesis of adipic acid and hydrogen

Journal of Energy Chemistry 2025年第2期101卷 7-15,I0001页

作者： Xuhui Ren Qianyu Zhang Yun Tong Guorong Zhou Cong Lin Yanying Zhao Pengzuo Chen School of Chemistry and Chemical Engineering Key Laboratory of Surface&Interface Science of Polymer Materials of Zhejiang ProvinceZhejiang Sci-Tech UniversityHangzhou 310018ZhejiangChina

Constructing electrocatalytic overall reaction technology to couple the electrosynthesis of adipic acid with energy-saving hydrogen production is of significant for sustainable energy ***,the development of highly-active bifunctional electrocatalysts remains a ***,3D hierarchical nickel-copper alloying arrays with dendritic morphology are manufactured by a simple electrodeposition process,standing for the excellent bifunctional electrocatalyst towards the co-production of adipic acid and H_(2)from cyclohexanone and *** membrane-free flow electrolyzer of Cu_(0.81)Ni_(0.19)/NF shows the superior electrooxidation performance of ketone-alcohol(KA)oil with high faradaic efficiencies of over 90%for adipic acid and H_(2),robust stability over 200 h as well as a high yield of 0.6 mmol h^(-1) for adipic acid at 100 mA cm^(-2).In-situ spectroscopy indicates the Cu_(0.81)Ni_(0.19)alloy contributes to forming more active NiOOH species to involve in the conversion of cyclohexanone to adipic acid,while the proposed reaction pathway undergoes the 2-hydroxycyclohexanone and 2,7-oxepanedione ***,the theoretical calculations confirm that the optimal electronic interaction,boosted reaction kinetics as well as improved adsorption free energy of reaction intermediates,synergistically endows Cu_(0.81)Ni_(0.19)alloy with superior bifunctional performance.

关键词： Cu_(0.81)Ni_(0.19)alloy Adipic acid Hydrogen fuel Cyclohexanone oxidation reaction Hydrogen evolution reaction

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Fabrication and characterization of ceramic WC10Co4Cr-YSZ composite coating via HVOF spraying core-shell powders

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Ceramics International 2025年第14期51卷 19058-19070页

作者： Li, Ming-Xi Wei, Wei Zhao, Yibo Li, Ming Huang, Haibo Chen, Zhe Xie, Xiao-Ming Liu, Xiu-Bo Hunan Agricultural Equipment Research Institute Changsha410125 China Hunan Institute of Agricultural Environment and Ecology Changsha410125 China Hunan Province Key Laboratory of Materials Surface/Interface Science & Technology Central South University of Forestry & Technology Changsha410004 China

Improving the fracture toughness of agricultural soil-engaging components can mitigate the detrimental effects of hard particles in the soil while maintaining the wear resistance of the components, thereby improving the service performance. The wear resistance of the parts can be improved by surface treatment, but the surface toughness after treatment still needs to be further improved. In this study, WC10Co4Cr@YSZ (Yttria Stabilized Zirconia) core-shell structured composite powder was synthesized by modifying commercial WC10Co4Cr powder using the sol-gel method, and WC10Co4Cr coatings were prepared using the powders before and after modification. The microstructure of the powder and coatings were characterized. The mechanical properties and wear resistance of the coatings were evaluated through microhardness, nanoindentation, and friction testing. The hardness of the YSZ-modified composite coating was comparable to that of the unmodified coating, yet it exhibited lower porosity and twice the fracture toughness. Wear test results indicated that the coating's wear loss was greatly reduced compared with the substrate. In addition, the wear rate of the YSZ-modified coating was 71.11 % lower than the unmodified coating, demonstrating its exceptional wear resistance. The findings show that incorporation of YSZ into the coating system further enhanced wear resistance. The strengthening mechanisms resulting from the YSZ inclusion include the pinning effect, which controls the size and distribution of the WC grains, the shell structure that prevents overheating, and the improved fracture toughness of the coating. This work provides a new way to extend the service time of agricultural soil-engaging components. © 2025 Elsevier Ltd and Techna Group S.r.l.

关键词： Fracture toughness

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Charge polarity inversion and zincophilicity improvement for chitosan separator towards durable aqueous zinc-ion batteries

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Journal of Energy Chemistry 2025年第2期101卷 110-119,I0004页

作者： Jiaqi Yu Bo Liu Hong Ma Zehua Fan Xiang Han Qinghua Tian Jizhang Chen Co-Innovation Center of Efficient Processing and Utilization of Forest Resources College of Materials Science and EngineeringNanjing Forestry UniversityNanjing 210037JiangsuChina College of Mathematics and Physics Jinggangshan UniversityJi'an 343009JiangxiChina Key Laboratory of Surface&Interface Science of Polymer Materials of Zhejiang Province School of Chemistry and Chemical EngineeringZhejiang Sci-Tech UniversityHangzhou 310018ZhejiangChina

Aqueous zinc-ion batteries encounter enormous challenges such as Zn dendrites and parasitic *** modification is a highly effective strategy to address these *** the advantages of low cost,nontoxicity,biodegradability,good film-forming ability,superior hydro phi licity,and rich functional groups,chitosan is an ideal matrix for constructing ***,the presence of positive charges within chitosan in weakly acidic electrolytes is unfavorable for dendrite ***,Schiff base reaction is introduced to modify chitosan matrix,transforming its charge polarity from positive to ***,NbN with excellent zincophilicity is coated onto chitosan matrix,forming a Janus separator with low thickness of 19μm and considerably improved mechanical *** resultant separator can promote the transport of Zn^(2+)ions while triggering a repulsive shielding effect against anions,therefore dramatically enhancing Zn^(2+)ion transfer number from 0.28 to *** separator can also facilitate desolvation process,improve exchange current density,restrict two-dimensional Zn^(2+)ion diffusion,and enhance electrochemical kinetics,contributing to significantly inhibited dendrite growth,by-product formation,and hydrogen ***,stable and reversible Zn stripping/plating process is enabled for over 2500 h at 2 mA cm^(-2)and 2 mAh cm^(-2).And great rate capability and excellent cyclability can be achieved for full batteries even under harsh *** work provides new insights into separator design for Zn-based batteries.

关键词： Separator modification Charge polarity regulation Dendrite inhibition Aqueous zinc-ion batteries Chitosan utilization

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Fully enhances the performance of eutectic hydrogels in the field of flexible sensors by cellulose

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International Journal of Biological Macromolecules 2025年第Pt 2期311卷 143914页

作者： Li, Yong Deng, Xin Cao, Peng Liu, Haoxiang Qing, Rongmei Dai, Zejia Guo, Fengxuan College of Materials Science and Engineering Central South University of Forestry and Technology Hunan Changsha410004 China Hunan Province Key Laboratory of Materials Surface & Interface Science and Technology Central South University of Forestry and Technology Hunan Changsha410004 China

Deep eutectic hydrogels (DES hydrogels), fabricated from deep eutectic solvents (DES), offer superior stability and applicability compared to traditional polymer-based hydrogels. However, most DES hydrogels exhibit substantial hysteresis during stretching and low electrical conductivity due to the viscous nature of the solvents. This study presents an effective approach to enhance DES hydrogel performance. By anchoring flexible chains at various scales and using water as a lubricant, we obtained a eutectic hydrogel with high conductivity, low hysteresis, frost resistance and long service life. Testing demonstrated a 2.28-fold increase in conductivity (1.28 S/m), a 2.5-fold increase in tensile strength, and 1363 % elongation at break. Furthermore, the hydrogel retained excellent flexibility and tensile strength after 60 days at room temperature in an open-air environment. This demonstrates the DES hydrogel's significant potential for flexible sensor applications. This research provides a viable strategy for preparing high-performance DES hydrogels. © 2025

关键词： Conductive hydrogel Flexible sensor Microfibrillated cellulose (MFC)

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Influence of conversion rate of Si to SiC of C/C-SiC for high-speed trains on braking behavior at high braking energy density

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Ceramics International 2025年

作者： Xu, Yuxuan Li, Zesheng Chen, Qi Liu, Donglin Wang, Xing Liu, Ziyi Chen, Deshan Zhou, Haibin Han, Yong Yao, Pingping State Key Laboratory of Powder Metallurgy Central South University Changsha410083 China Hunan Province Key Laboratory of Materials Surface/Interface Science & Technology Central South University of Forestry & Technology Changsha410004 China

The effects of the conversion rate of Si to SiC (Rs) on braking behavior was investigated. The results indicate that a moderate Rs (38.360) combined with a uniform distribution of pyrolytic carbon facilitates the formation of a homogeneous metal tribo-layer, maintaining a stable coefficient of friction (COF) and superior wear resistance. High Rs (92.518) and lower pyrolytic carbon concentration are more susceptible to abrasive and fatigue wear, leading to surface delamination. Fewer Rs (9.475) and abundant pyrolytic carbon contribute to the high-temperature oxidation of pyrolytic carbon accelerates adhesive wear, resulting in an increased COF and inferior wear resistance. © 2025 Elsevier Ltd and Techna Group S.r.l.

关键词： Silicon carbide

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A review on dissolved organic matter derived from biochar in soil:Characterizations,interaction with pollutants,and transformation

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Journal of Central South University 2025年第1期32卷 122-148页

作者： ZHANG Xiu-xiu NAN Hong-yan LIU Gong-gang SHOW Pau-Loke WANG Chong-qing School of Chemical Engineering Zhengzhou UniversityZhengzhou 450001China Hunan Province Key Laboratory of Materials Surface and Interface Science and Technology College of Materials Science and EngineeringCentral South University of Forestry and TechnologyChangsha 410004China Department of Chemical Engineering Khalifa UniversityP.O.Box 127788Abu DhabiUnited Arab Emirates

Biochar-derived dissolved organic matter(BCDOM),an essential component of biochar,plays a vital role in regulating the physicochemical and biological properties of soils during biochar ***,the influence of BCDOM on soil organisms has not been clearly ***,this review aims to discuss the factors affecting BCDOM and its interaction with soil substances including organic pollutants,heavy metals,and *** displayed that the quantity of BCDOM ranges from 0.17 to 37.03 mg/g,which was influenced by feedstock,preparation methods of biochar,and extraction *** the decrease in lignin content of feedstocks,carbonization temperature,and acidity of extraction solution,the content of BCDOM *** complexation and adsorption,protein-like components in BCDOM interact with heavy metals,promoting the adsorption and immobilization of heavy metals onto ***,BCDOM enhances the adsorption of organic pollutants by biochar throughπ−πinteractions,hydrogen bonding,and redox *** importantly,BCDOM promotes plant growth by enhancing microbial activities,providing nutrients,and improving soil ***,the transport and fate of BCDOM in soil have not been well studied,and more researches are needed to explore the interaction mechanisms between BCDOM and soil organisms.

关键词： biochar dissolved organic matter heavy metals organic contaminants soil

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Microstructure and Electrochemical Corrosion Behavior of Laser Cladding (CoCrNiFeMo)91.5B6.0Si2.5 High-Entropy Alloy Coating on TC4 Titanium Alloy

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Physica Status Solidi (A) Applications and materials science 2025年第0期

作者： Xie, Fang Zhang, Xi Zhai, Changsheng Zhang, Xin Li, Xingchao Liu, Xiubo Hua, Xijin Henan Province Engineering Research Center of Additive Manufacturing Aeronautical Materials Nanyang Institute of Technology Henan Nanyang473004 China Nanyang Key Laboratory of Additive Manufacturing Technology and Equipment Nanyang Institute of Technology Henan Nanyang473004 China Technology Co. Ltd Jiangsu Xuzhou221116 China Hunan Province Key Laboratory of Materials Surface/Interface Science & Technology Central South University of Forestry & Technology Changsha410004 China Department of Engineering University of Exeter ExeterEX4 4QF United Kingdom

(CoCrNiFeMo)91.5B6.0Si2.5 high-entropy alloy (HEA) coatings are deposited on TC4 titanium alloy by laser cladding, and their microstructure and properties are investigated. The findings indicate that FCC1 and FCC2 are dendritic and euqiaxed structures, respectively, and that HEA coatings form a FCC + σ eutectic structure. A strong metallurgical bond and a high density interface fusion layer are created at v = 1200 mm min−1, and the laser energy density matches that of the cladding. The thermodynamic criteria for the FCC + σ eutectic phase in HEAs created by the nonequilibrium solidification are proposed as follows: δ ≤ 8.5%, 6.88 ≤ VEC ≤ 8, −17 ≤ ΔHmix ≤ 7 kJ mol−1, and PSFE ≥ 40 at%. The thermodynamic parameters of HEACs are as follows: δ = 8.46%, ΔHmix = −10.282 kJ mol−1, VEC = 7.2, and PSFE = 43 at%, which meet the criteria. The coating's cross-sectional hardness gradually drops from HEA-coating-zone, fusion-zone, heat-affected zone, and TC4 matrix. When v = 1200 mm min−1, the HEA-coating-zone has the highest mean microhardness (830.96 HV1.0). HEA coatings have a double passivation zone with the highest Ecorr (−0.1774 V) and a much lower Icorr (0.047 μA cm−2) than that of other scanning rates. Its FCC + σ eutectic structure, greater crystallinity, improved passivation effect, more dense microstructure, and fewer lattice and grain boundary defects all work together to provide its exceptional electrochemical corrosion performance. © 2025 Wiley-VCH GmbH.

关键词： Titanium alloys

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Two-Electron Redox Chemistry of Nitroxide Radicals: Fundamental Mechanisms and Applications in Energy Storage

ACS Electrochemistry

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ACS Electrochemistry 2025年第2期1卷 123-137页

作者： Kai Zhang Xiaoman Lin Yanlin Shi Kenichi Oyaizu Zhongfan Jia Key Laboratory of Surface & Interface Science of Polymer Materials of Zhejiang Province School of Chemistry and Chemical Engineering Zhejiang Sci-Tech University 928 Second Street Hangzhou 310018 China Institute for Nanoscale Science and Technology College of Science and Engineering Flinders University Sturt Road Bedford Park South Australia 5042 Australia Department of Applied Chemistry and Research Institute for Science and Engineering Waseda University Tokyo 169-8555 Japan

Theoretically, nitroxide radicals can undergo both 1e oxidation and 1e reduction reactions. Their high redox potentials and rapid electron transfer kinetics make them prominent organic cathodes in energy storage applications, particularly in rechargeable organic radical batteries (ORBs). However, most nitroxide-based ORBs could only realize the 1e oxidation reaction, limiting their storage capacity. Achieving the theoretical 2e redox reaction can double the energy storage capability, but it has been challenging due to the complexity of the 1e reduction reaction. This review systematically summarizes the studies on the electrochemical 2e redox reaction of nitroxide radicals. In particular, it discusses the parameters that significantly influence the potential and reversibility of 1e reduction. Furthermore, strategies developed so far to successfully achieve 2e energy storage in ORBs are outlined. Finally, the connection between fundamental electrochemical studies of 2e redox chemistry and its energy storage applications is established, offering valuable insights for developing implementable energy storage technologies.

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Construction of Ni−Ov−Ti interface Through Strong Metal-Support Interactions for Selective Hydrogenation of Nitroarenes to Anilines

SSRN

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SSRN 2025年

作者： Zhang, Chengcheng Chabu, Johnny Muya Wang, Liqiang Liu, You-Nian Hunan Provincial Key Laboratory of Micro & Nano Materials Interface Science College of Chemistry and Chemical Engineering Central South University Hunan Changsha410083 China Henan Province Industrial Technology Research Institute of Resources and Materials School of Material Science and Engineering Zhengzhou University Henan Zhengzhou450001 China University of Lubumbashi Faculty of Sciences and Technology Lubumbashi Democratic Republic Congo College of Material Chemistry and Chemical Engineering Hangzhou Normal University Zhejiang Hangzhou311121 China

The application of Raney Ni catalyst in the selective hydrogenation of nitroarenes to produce corresponding aromatic amines faces challenges such as poor selectivity to product and its pyrophoric nature. Herein, NiTiOx catalysts are designed by utilizing metal support-interactions to regulate the geometric and electronic properties of interface sites on the catalyst. Within the as-designed catalysts, metallic Ni nanoparticles are partially encapsulated by TiOx overlayers, forming unique Ni−Ov(oxygen vacancies)−Ti interface sites. The experimental and theoretical calculations indicate that TiOx can first promote selective adsorption and activation of nitro groups;meanwhile, Niδ− species at Ni−Ov(oxygen vacancies)−Ti interface serve as a high hydrogen dissociation site;then the dissociated hydrogen atom transfer from the interfacial Niδ− species to the Ov−Ti sites, and migrate through the TiOx overlayers to the reaction sites;finally achieving the hydrogenation reaction. The optimal NiTiOx-500 catalyst can achieve full conversion of nitroarenes (conv. > 99%) and high selectivity towards the corresponding amines (sel. > 99%) under mild conditions (1 MPa H2, and 40 °C), much better than commercial Raney Ni. This newly developed catalyst exhibits promising potential to serve as an alternative to the conventional Raney Ni catalyst. © 2025, The Authors. All rights reserved.

关键词： Dissociation

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Enhanced stability and efficiency of enzyme-inorganic hybrid nanoflowers for organophosphate degradation

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International Journal of Biological Macromolecules 2025年 313卷 144312页

作者： Qianqian Zhao Xiaohong Zhang Zhenzhen Chen Tianfeng Hu Sai Wang Lingfeng Deng Zhiyan Chen Yuanjuan Bai Kun Du Hunan Province Key Laboratory of Materials Surface and Interface Science and Technology College of Materials Science and Engineering Central South University of Forestry and Technology Shaoshan South Road No. 498 Changsha 410004 China

Enzyme catalysis is characterized by high efficiency and selectivity; however, the natural enzymes are prone to inactivation once removed from their native environment. The immobilization of enzyme using solid-phase carriers presents an effective strategy to enhance the structural stability of natural enzymes. In this study, organophosphate hydrolase (OPH) was utilized as the organic component, while ferrous phosphate served as the inorganic component, leading to the synthesis of enzyme-inorganic hybrid nanoflower materials through biomimetic mineralization. After characterizing the microstructure and compositional characteristics of this composite material, the hydrolysis of para-nitrophenyl phosphate (PNPP) was employed as a probe reaction to determine the optimal temperature (30 °C) and the ideal pH value (9) for the immobilized enzyme. Due to the protective effect of the inorganic carrier, the immobilized enzyme exhibited significantly enhanced thermal stability, acid-base resistance, proteolytic resistance, organic solvent tolerance, and reusability compared to the free enzyme. In addition, the potential of this immobilized enzyme for stepwise degradation of toxic organophosphorus compounds by tandem hydrolysis reactions and advanced oxidation processes was further validated. This work provides a novel approach to further expand the application scope of multi-component cascade catalytic systems based on enzyme-inorganic hybrid nanoflowers.

关键词： Biomimetic mineralization Enzymes Tandem reaction

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