In situ embedded bismuth nanoparticles among highly porous carbon fibers for efficient carbon dioxide reduction  

作　　者：Wei-Jian Guo Ao Zhou Wen-Wen Cai Jin-Tao Zhang 

机构地区：[1]Key Laboratory for Colloid and Interface Chemistry(Ministry of Education),School of Chemistry and Chemical Engineering,Shandong University,Jinan 250100,China

出　　处：《Rare Metals》2024年第9期4312-4320,共9页稀有金属（英文版）

基　　金：supported by the National Natural Science Foundation of China(Nos.22175108 and 22379086);the Natural Science Foundation of Shandong Province(Nos.ZR2020JQ09 and ZR2022ZD27);Taishan Scholars Program of Shandong Province(tstp20221105)。

摘　　要：Electrocatalysis provides an optimal approach for the conversion of carbon dioxide(CO_(2))into high-value chemicals,thereby presenting a promising avenue toward achieve carbon neutrality.However,addressing the selectivity and stability challenges of metal catalysts in electrolytic reduction remains a daunting task.In this study,the electrospinning method is employed to fabricate porous carbon nanofibers loaded with bismuth nanoparticles with the help of in situ pyrolysis.The porous carbon nanofibers as conductive support would facilitate the dispersion of bismuth active sites while inhibiting their aggregation and promoting the mass transfer,thus enhancing their electrocatalytic activity and stability.Additionally,nitrogen doping induces electron delocalization in bismuth atoms through metal-support interactions,thus enabling efficient adsorption of intermediates for improving selectivity based on the theoretical calculation.Consequently,Bi@PCNF-500 exhibits the exceptional selectivity and stability across a wide range of potential windows.Notably,its faradaic efficiency(FE)of formate reaches 92.7%in H-cell and94.9%in flow cell,respectively,with good electrocatalytic stability.The in situ characterization and theoretical calculations elucidate the plausible reaction mechanism to obtain basic rules for designing efficient electrocatalyst.

关 键 词：Porous carbon nanofiber N-DOPING Electron delocalization Carbon dioxide reduction 

分 类 号：X701[环境科学与工程—环境工程] TQ426[化学工程]