Size-dependent activity of Fe-N-doped mesoporous carbon nanoparticles towards oxygen reduction reaction  

作　　者：Yilun Zhao Zhengbin Tian Wenquan Wang Xiaohui Deng Jo-Chi Tseng Guanghui Wang 

机构地区：[1]Qingdao Institute of Bioenergy and Bioprocess Technology,Chinese Academy of Sciences,Qingdao 266101,China [2]Shandong Energy Institute,Qingdao 266101,China [3]Qingdao New Energy Shandong Laboratory,Qingdao 266101,China [4]University of Chinese Academy of Sciences,Beijing 100049,China [5]Japan Synchrotron Radiation Research Institute,Hyogo 679-5198,Japan

出　　处：《Green Carbon》2024年第2期221-230,共10页绿碳（英文）

基　　金：supported by Major Basic Research Program of Natural Science Foundation of Shandong Province under Grant(ZR2022ZD30);Qingdao New Energy Shandong Laboratory Open Project(Grant:QNESL OP 202307);Natural Science Foundation of Shandong Province(ZR2023QB103);China Postdoctoral Science Foundation(2023M733609);Qingdao Postdoctoral Applied Research Project(QDBSH20230202075).

摘　　要：The rational design of Fe–N–C catalysts that possess easily accessible active sites and favorable mass transfer,which are usually determined by the structure of catalyst supports,is crucial for the oxygen reduction reaction(ORR).In this study,an oleic acid-assisted soft-templating approach is developed to synthesize size-controlled nitrogen-doped carbon nanoparticles(ranging from 130 nm to 60 nm and 35 nm,respectively)that feature spiral mesopores on their surface(SMCs).Next,atomically dispersed Fe–Nx sites are fabricated on the size-tunable SMCs(Fe1/SMC-x,where x represents the SMC size)and the size-dependent activity toward ORR is investigated.It is found that the catalytic performance of Fe1/SMCs is significantly influenced by the size of SMCs,where the Fe1/SMC-60 catalyst shows the highest ORR activity with a half-wave potential of 0.90 V vs.RHE in KOH electrolyte,indicating that the gas-liquid-solid three-phase interface on the Fe1/SMC-60 enhances the accessibility of Fe–Nx sites.In addition,when using Fe1/SMC-60 as the cathode catalyst in aqueous zinc-air batteries(ZABs),it delivers a higher open-circuit voltage(1.514 V),a greater power density(223 mW cm^(−2)),and a larger specific capacity/energy than Pt/C-based counterparts.These results further highlight the potential of Fe1/SMC60 for practical energy devices associated with ORR and the importance of size-controlled synthesis of SMCs.

关 键 词：Soft-templating approach Size-dependent activity Fe-N-C catalyst Oxygen reduction reaction Zinc-air battery 

分 类 号：O64[理学—物理化学]