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Scalable graphene foam with ultrahigh conductivity for stabilizing Pt towards efficient hydrogen evolution

Nano Research 2024年第8期17卷 6968-6976页

作者： Ming Zhao Meng Huang Huihui Jin Dayin He Wei Qian Zixin Zhang Daping He State Key Laboratory of Advanced Technology for Materials Synthesis and Processing Wuhan University of TechnologyWuhan 430070China Hubei Engineering Research Center of RF-Microwave Technology and Application Wuhan University of TechnologyWuhan 430070China School of Information Engineering Wuhan University of TechnologyWuhan 430070China School of Chemistry and Materials Science University of Science and Technology of ChinaHefei 230026China Sanya Science and Education Innovation Park of Wuhan University of Technology Sanya 572000China

For the carbon-based catalyst to be active and stable,especially in harsh electrochemical environments,the key is to decrease the concentration of defects and raise the degree of graphitization of the carbon ***,we develop a highly graphitized graphene foam with multiplicated structure to fabricate self-supporting Pt-based catalysts for efficient and stable hydrogen evolution reaction(HER)*** foam(GO-2850)is obtained through an ultra-high temperature treatment at 2850℃,with perfect graphene structure and extremely low defect,ensuring high electrical conductivity and corrosion ***,its multiplicated structure provides an inherently favorable environment for the dispersion of Pt nanoparticles(Pt NPs)and offers abundant channels for electrolyte infiltration during the catalytic *** a result,the as-prepared Pt/GO-2850 is far active and stable than the Pt NPs supported on commercial carbon paper(Pt/CP)counterpart toward catalyzing HER,exhibiting an outstanding activity and long-term durability(300 h@10 mA·cm^(−2))in acidic/alkaline/seawater *** can be attributed to the stronger interaction between the lower-defect GO-2850 substrate and Pt,as evidenced by characterization and theoretical *** work extends further insight into the design self-supporting catalysts of high activity and stability with promising prominent application toward green energy devices.

关键词： graphene foam high graphitization Pt nanoparticles hydrogen evolution reaction long-term stability

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Bio-derived N-doped porous carbon as sulfur hosts for high performance lithium sulfur batteries

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Journal of Central South University 2019年第6期26卷 1426-1434页

作者： LIU Yan-yan YAN Li-jing ZENG Xian-qing LI Ze-heng ZHOU Shu-dong DU Qiao-kun MENG Xiang-juan ZENG Xiao-min LING Min SUN Ming-hao QIAN Chao LIANG Cheng-du Zhejiang Provincial Key Laboratory of Advanced Chemical Engineering Manufacture Technology College of Chemical and Biological Engineering Zhejiang University

Shuttle effect,poor conductivity and large volume expansion are the main factors that hinder the practical application of sulfur ***,rational structure designing of carbon-based sulfur hosts is the most effective strategy to address the above ***,the preparation process of carbon-based sulfur hosts is usually complex and ***,it is necessary to develop an efficient and cost-effective method to fabricate carbon hosts for high-performance sulfur ***,we reported the fabrication of a bio-derived nitrogen doped porous carbon materials(BNPC)via a molten-salt method for high performance sulfur *** long-range-ordered honeycomb structure of BNPC is favorable for the trapping of polysulfide(PS)species and accommodates the volumetric variation of sulfur during cycling,while the high graphitization degree of BNPC favors the redox kinetics of sulfur ***,the nitrogen doping content not only enhances the electrical conductivity of BNPC,but also provides ample anchoring sites for the immobilization of PS,which plays a key role in suppressing the shuttle *** a result,the S@BNPC cathode exhibits a high initial specific capacity of 1189.4 mA·h/g at *** 300 cycles,S@BNPC still maintains a capacity of 703.2 mA·h/g which corresponds to a fading rate of 0.13%per cycle after the second *** work offers vast opportunities for the large-scale application of high performance carbon-based sulfur hosts.

关键词： lithium sulfur batteries high graphitization nitrogen doping sulfur hosts shuttle effect

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