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Nitrogen and atomic Fe dual-doped porous carbon nanocubes as superior electrocatalysts for acidic H2-O_(2) PEMFC and alkaline Zn-air battery

查看全文 作　　者：Xiudong [1]Shi;Zonghua [1]Pu;Bin [1]Chi;Mingrui [1]Liu;Siyan [1]Yu;Long [1]Zheng;Lijun [2]Yang;Ting [1]Shu;Shijun [1]Liao 高影响力作者 机构地区：[1]The Key Laboratory of Fuel Cell Technology of Guangdong Province&the Key Laboratory of New Energy Technology of Guangdong Universities,School of Chemistry and Chemical Engineering,South China University of Technology,Guangzhou 510641,China;[2]Ballard Power Systems,9000 Glenlyon Parkway,Burnaby V5J 5J8,Canada高影响力机构 出　　处：《Journal of Energy Chemistry》索引2021年第30卷第8期,共9页高影响力期刊 基　　金：supported by the National Natural Science Foundation of China(NSFC Project Nos.21776104,21476088);the National Key Research and Development Program of China(Project Nos.2016YFB0101201,2017YFB0102900);the Guangdong Provincial Department of Science and Technology(Project No.2015B010106012);the Guangzhou Science,Technology and Innovation Committee(Project Nos.201504281614372,2016GJ006)。 摘　　要：Air cathodes with high electrocatalytic activity are vital for developing H2/O_(2) proton exchange membrane fuel cells(PEMFC)and Zn-air batteries.However,the state-of-the-art air cathodes suffer from either limited catalytic activity or high cost,which thus hinder their applications.Herein,we designed ZIF-8 derived nitrogen and atomic iron dual-doped porous carbon nanocubes as high-quality catalysts for ORR,through a novel gas-doping approach.The porous carbon nanocubic architecture and abundant Fe-Nxactive species endow ZIF-8 derived single atomic iron catalyst(PCN-A@Fe SA)with superior catalytic activity,and surpass Pt/C and a majority of the reported catalysts.Both XAS and DFT calculations suggest that Fe2+N4 moieties are the main active centers that are favorable for oxygen affinity and OH*intermediate desorption,which can result in promising catalytic performance.Most importantly,PCNA@Fe SA can achieve power density of 514 m W cm^(-2) as cathodic catalyst in a PEMFC and discharge peak power density of 185 m W cm^(-2) in an alkaline Zn-air battery.The outstanding performance is derived from both the high specific surface area and high-density of iron single atom in nitrogen doped nanocubic carbon matrix. 关 键 词：Gaseous doping Fe-Nx sites Fe single atoms Oxygen reduction reaction ELECTROCATALYSTS
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