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Support effect and confinement effect of porous carbon loaded tin dioxide nanoparticles in high-performance CO_(2) electroreduction towards formate

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Chinese Chemical Letters 2025年第1期36卷 597-602页

作者： Xingxing Jiang Yuxin Zhao Yan Kong Jianju Sun Shangzhao Feng Xin Lu Qi Hu Hengpan Yang Chuanxin He college of chemistry and environmental Engineering Shenzhen UniversityShenzhen 518060China

Leveraging the interplay between the metal component and the supporting material represents a cornerstone strategy for augmenting electrocatalytic efficiency,e.g.,electrocatalytic CO_(2)reduction reaction(CO_(2)RR).Herein,we employ freestanding porous carbon fibers(PCNF)as an efficacious and stable support for the uniformly distributed SnO_(2)nanoparticles(SnO_(2)PCNF),thereby capitalizing on the synergistic support effect that arises from their strong *** one hand,the interaction between the SnO_(2)nanoparticles and the carbon support optimizes the electronic configuration of the active *** interaction leads to a noteworthy shift of the d-band center toward stronger intermediate adsorption energy,consequently lowering the energy barrier associated with CO_(2)*** a result,the Sn O_(2)PCNF realizes a remarkable CO_(2)RR performance with excellent selectivity towards formate(98.1%).On the other hand,the porous carbon fibers enable the uniform and stable dispersion of SnO_(2)nanoparticles,and this superior porous structure of carbon supports can also facilitate the exposure of the SnO_(2)nanoparticles on the reaction interface to a great ***,adequate contact between active sites,reactants,and electrolytes can significantly increase the metal utilization,eventually bringing forth a remarkable7.09 A/mg mass *** work might provide a useful idea for improving the utilization rate of metals in numerous electrocatalytic reactions.

关键词： CO_(2)electroreduction Support effect Porous carbon fiber Formate Mass activity

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Electrochemical removal of nitrate in high-salt wastewater with low-cost iron electrode modified by phosphate

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Journal of environmental sciences 2025年第2期148卷 38-45页

作者： Fengjiao Quan Guangming Zhan Pengfei Xu Xiaolan Chen Wenjuan Shen Falong Jia Yun He Jianfen Li college of Chemical and environmental Engineering Wuhan Polytechnic UniversityWuhan 430023China college of chemistry Central China Normal UniversityWuhan 430079China School of environmental science and Engineering Shanghai Jiao Tong UniversityShanghai 200240China

Nitrate(NO3-)is a widespread pollutant in high-salt wastewater and causes serious harm to human *** electrochemical removal of nitrate has been demonstrated to be a promising treatment method,the development of low-cost electro-catalysts is still *** this work,a phosphate modified iron(P-Fe)cathode was prepared for electrochemical removal of nitrate in high-salt *** phosphate modification greatly improved the activity of iron,and the removal rate of nitrate on P-Fe was three times higher than that on Fe *** experiments and density functional theory(DFT)calculations demonstrated that the modification of phosphoric acid improved the stability and the activity of the zero-valent iron electrode effectively for *** nitrate was firstly electrochemically reduced to ammonium,and then reacted with the anodic generated hypochlorite to *** this study,a strategy was developed to improve the activity and stability of metal electrode for NO_(3)^(-)removal,which opened up a new field for the efficient reduction of NO3-removal by metal electrode materials.

关键词： Nitrate removal High-salt wastewater Electrocatalysis Phosphate modified Iron

Copper-catalyzed C–H bond functionalization enabled by programmed alternating current

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science China chemistry 2025年第1期68卷 10-11页

作者： Zhoumei Tan Kun Xu Chengchu Zeng Beijing Key Laboratory of environmental and Viral Oncology College of Chemistry and Life ScienceBeijing University of TechnologyBeijing 100124China

Synthetic electrochemistry has been selected as one of the Top Ten Emerging Technologies in chemistry in 2023 by International Union of Pure and Applied chemistry(IUPAC)^([1]).It has emerged as a sustainable platform for organic synthesis and has exhibited a wide range of applications from academia to industry^([2]).However,electrosynthesis has been predominantly performed by using direct current(DC).

关键词： catalyzed Copper IUPAC

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Atomically precise M-N-C electrocatalysts for oxygen reduction:Effects of inter-site distance,metal-metal interaction,coordination environment,and spin states

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Journal of Energy chemistry 2025年第2期101卷 132-155页

作者： Junfeng Huang Saira Ajmal Anuj Kumar Jianwen Guo Mohammed Mujahid Alam Abdullah G.Al-Sehemi Ghulam Yasin School of Mechanical Engineering Dongguan University of Technology Nano-Technology Research Laboratory Department of Chemistry GLA University Department of chemistry College of Science King Khalid University School of environmental science and Engineering Tianjin University State Key Laboratory of Chemical Resource Engineering College of Materials Science and Engineering Beijing University of Chemical Technology

Inspired by molecular catalysts,researchers developed atomically precise nitrogen-coordinated single or dual metal sites imbedded in graphitized carbon（M-N-C） to fully utilize metallic sites for *** catalysts performed remarkably well in the electrocatalytic oxygen reduction reaction（ORR） due to their distinct coordination and electrical structures,Nonetheless,their maximum efficacy in practical applications has yet to be *** agenda identifies tailoring the coordination environment,spin states,intersite distance,and metal-metal interaction as innovative approaches to regulate the ORR performance of these ***,it is necessary to undertake a precise assessment of these methodologies and the knowledge obtained to be implemented in the design of future M-N-C catalysts for ***,this review aims to analyze recent progress in M-N-C ORR catalysts,emphasizing their innovative engineering with aspects such as alteration in intersite distance,metal-metal interaction,coordination environment,and spin ***,we critically discuss how to logically monitor the atomic structure,local coordination,spin,and electronic states of M-N-C catalysts to modulate their ORR *** have also highlighted the challenges associated with M-N-C catalysts and proposed suggestions for their future design and fabrication.

关键词： Activity descriptors Electrocatalysis M-N-C electrocatalysts ORR Spin states

Effects of the extrusion parameters on microstructure,texture and room temperature mechanical properties of extruded Mg-2.49Nd-1.82Gd-0.2Zn-0.2Zr alloy

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International Journal of Minerals,Metallurgy and Materials 2025年第1期32卷 136-146页

作者： Chenjin Zhang Guangyu Yang Lei Xiao Zhiyong Kan Jing Guo Qiang Li Wanqi Jie State Key Laboratory of Solidification Processing Northwestern Polytechnical UniversityXi’an 710072China college of Materials science and Engineering Fuzhou UniversityFuzhou 350108China college of chemistry and environmental science Qujing Normal UniversityQujing 655011China

Microstructure,texture,and mechanical properties of the extruded Mg-2.49Nd-1.82Gd-0.2Zn-0.2Zr alloy were investigated at different extrusion temperatures(260 and 320℃),extrusion ratios(10:1,15:1,and 30:1),and extrusion speeds(3 and 6 mm/s).The experimental results exhibited that the grain sizes after extrusion were much finer than that of the homogenized alloy,and the second phase showed streamline distribution along the extrusion direction(ED).With extrusion temperature increased from 260 to 320℃,the microstructure,texture,and mechanical properties of alloys changed *** dynamic recrystallization(DRX)degree and grain sizes enhanced as the extrusion ratio increased from 10:1 to 30:1,and the strength gradually decreased but elongation(EL)*** the extrusion speed increased from 3 to 6 mm/s,the grain sizes and DRX degree increased significantly,and the samples presented the typical-rare-earth(RE)*** alloy extruded at 260℃ with extrusion ratio of 10:1 and extrusion speed of 3 mm/s showed the tensile yield strength(TYS)of 213 MPa and EL of 30.6%.After quantitatively analyzing the contribution of strengthening mechanisms,it was found that the grain boundary strengthening and dislocation strengthening played major roles among strengthening *** results provide some guidelines for enlarging the industrial application of extruded Mg-RE alloy.

关键词： Mg-rare earth alloys extrusion temperature extrusion ratio extrusion speed strengthening mechanisms

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Integrating Cu+/Cu0 sites on porous nitrogen-doped carbon nanofibers for stable and efficient CO2 electroreduction to multicarbon products

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Journal of Energy chemistry 2025年第2期101卷 453-462页

作者： Yicheng Chao Jiahao Zhang Qinyue Wu Xinfei Fan Xie Quan Yanming Liu Key Laboratory of Industrial Ecology and environmental Engineering (MOE) School of Environmental Science and Technology Dalian University of Technology college of environmental science and Engineering Dalian Maritime University Frontier science Center for Smart Materials Dalian University of Technology

The Cu+/Cu0sites of copper-based catalysts are crucial for enhancing the production of multicarbon(C2+)products from electrochemical CO2reduction reaction（eCO2RR）.However,the unstable Cu+and insufficient Cu+/Cu0active sites lead to their limited selectivity and stability for C2+***,we embedded copper oxide（CuOx） particles into porous nitrogen-doped carbon nanofibers（CuOx@PCNF）by pyrolysis of the electrospun fiber film containing ZIF-8 and Cu2O *** porous nitrogendoped carbon nanofibers protected and dispersed Cu+species,and its micro porous structure enhanced the interaction between CuOxand reactants during *** obtained CuOx@PCNF created more effective and stable Cu+/Cu0active *** showed a high Faradaic efficiency of 62.5% for C2+products in Hcell,which was 2 times higher than that of bare CuOx（～31.1%）.Furthermore,it achieved a maximum Faradaic efficiency of 80.7% for C2+products in flow *** situ characterization and density functional theory（DFT） calculation confirmed that the N-doped carbon layer protected Cu+from electrochemical reduction and lowered the energy barrier for the dimerization of**** and exposed Cu+/Cu0active sites enhanced the enrichment of*CO and promoted the C-C coupling reaction on the catalyst surface,which facilitated the formation of C2+products.

关键词： Carbon nanofibers Cu+/Cu0 sites C–C coupling Electrocatalytic CO2 reduction Multicarbon products

The mechanisms of pH regulation on promoting volatile fatty acids production from kitchen waste

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Journal of environmental sciences 2025年第1期147卷 414-423页

作者： Feng Liu Tingting Wang Leiyu Feng Yinguang Chen college of environmental science and Engineering Tongji UniversityShanghai 200092China TUS-environmental science and Technology Development Co. Ltd.Beijing 100084China

The anaerobic acid production experiments were conducted with the pretreated kitchen waste under pH *** results showed that pH 8 was considered to be the most suitable condition for acid production,especially for the formation of acetic acid and propionic *** average value of total volatile fatty acid at pH 8 was 8814 mg COD/L,1.5 times of that under blank *** average yield of acetic acid and propionic acid was 3302 mg COD/L and 2891 mg COD/L,*** activities of key functional enzymes such as phosphotransacetylase,acetokinase,oxaloacetate transcarboxylase and succinylcoA transferase were all *** further explore the regulatory mechanisms within the system,the distribution of microorganisms at different levels in the fermentation system was obtained by microbial sequencing,results indicating that the relative abundances of Clostridiales,Bacteroidales,Chloroflexi,Clostridium,Bacteroidetes and Propionibacteriales,which were great contributors for the hydrolysis and acidification,increased rapidly at pH 8 compared with the blank ***,the proportion of genes encoding key enzymes was generally increased,which further verified the mechanism of hydrolytic acidification and acetic acid production of organic matter under pH regulation.

关键词： Kitchen waste Acid fermentation Volatile fatty acids pH regulation Functional genes

A binary eutectic electrolyte design for high-temperature interface-compatible Zn-ion batteries

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Journal of Energy chemistry 2025年第2期101卷 587-597页

作者： Guomin Li Wentao Wen Kefeng Ouyang Yanyi Wang Jianhui Zhu Ming Yang Hongwei Mi Ning Zhao Peixin Zhang Dingtao Ma college of chemistry and environmental Engineering Shenzhen University School of Materials science and Engineering Harbin Institute of Technology (Shenzhen) School of Materials and environmental Engineering Shenzhen Polytechnic Guangdong Flexible Wearable Energy and Tools Engineering Technology Research Center

The deterioration of aqueous zinc-ion batteries（AZIBs） is confronted with challenges such as unregulated Zn2+diffusion,dendrite growth and severe decay in battery performance under harsh ***,a design concept of eutectic electrolyte is presented by mixing long chain polymer molecules,polyethylene glycol dimethyl ether（PEGDME）,with H2O based on zinc trifluoromethyl sulfonate(Zn（OTf）2),to reconstruct the Zn2+solvated structure and in situ modified the adsorption layer on Zn electrode *** dynamics simulations（MD）,density functional theory（DFT） calculations were combined with experiment to prove that the long-chain polymer-PEGDME could effectively reduce side reactions,change the solvation structure of the electrolyte and priority absorbed on Zn（002）,achieving a stable dendrite-free Zn *** to the comprehensive regulation of solvation structure and zinc deposition by PEGDME,it can stably cycle for over 3200 h at room temperature at 0.5 mA/cm2and 0.5 mAh/*** at high-temperature environments of 60℃,it can steadily work for more than 800 cycles（1600 h）.Improved cyclic stability and rate performance of aqueous Zn‖VO2batteries in modified electrolyte were also achieved at both room and high *** that,the demonstration of stable and high-capacity Zn‖VO2pouch cells also implies its practical application.

关键词： Dendrite suppression Eutectic electrolyte High temperature Solvation structure Zn anode

Polyvinyl alcohol fiber with enhanced strength and modulus and intense cyan fluorescence based on covalently functionalized graphene quantum dots

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Chinese Chemical Letters 2025年第2期36卷 250-255页

作者： Manman Ou Yunjian Zhu Jiahao Liu Zhaoxuan Liu Jianjun Wang Jun Sun Chuanxiang Qin Lixing Dai college of chemistry Chemical Engineering and Materials Science Soochow University

In this study, we proposed a novel and efficient way to strengthen polyvinyl alcohol(PVA) fiber using graphene quantum dots(GQDs). PVA molecular chains were grafted onto the surface of GQDs through Friedel-Crafts alkylation reaction to obtain functionalized GQDs(f-GQDs), and PVA/f-GQDs composite fiber was successfully prepared by wet spinning and post-treatment. The tensile strength and Young's modulus of the composite fiber reached up to 1229.24 MPa and 35.36 GPa which were approximately twice and 4 times those of the pure PVA fiber, respectively. Moreover, the composite fiber was demonstrated excellent resistance to solvents. In addition, the PVA/f-GQDs composite fiber showed intense and uniform cyan fluorescence, meanwhile, it could maintain stable solid-state fluorescence in acid and alkali solutions and particularly after long-term immersion in water(1 month). This study proposes a promising route for obtaining high-performance conventional fibers with some new functions.

关键词： Enhancement Fluorescence Graphene quantum dots Polyvinyl alcohol fiber