Carbon Nanofibers Encapsulated CoNiFe Bifunctional Electrocatalysts for Durable Zn-Air Batteries at Room and -40℃ Ultralow Temperatures  

作　　者：Mingyan Zhang Yudong Gong Yan Liu Yake Liu Shiqing Huang Ziqiang Niu Xueting Zhang Xiuling Zhang Dapeng Cao 

机构地区：[1]State Key Laboratory of Organic-Inorganic Composites,Beijing University of Chemical Technology,Beijing 100029 [2]Huaneng Clean Energy Research Institute,CHNG Innovation Base,Beijing 102209

出　　处：《Renewables》2024年第5期353-363,共11页可再生能源（英文）

基　　金：supported by the National Natural Science Foundation of China(grant no.52103250);the Opening Foundation of State Key Laboratory of Organic-Inorganic Composites,China(grant no.oic-202301001);the Fundamental Research Funds for the Central Universities,China(grant no.buctrc202213).

摘　　要：Reasonably designing composition and nanostructure to enhance the stability of bifunctional catalysts is highly desired for rechargeable Zn-air batteries(ZABs).Here,porous carbon nanofibers(CNFs)encapsulated CoNiFe alloy nanoparticles(NPs)(CoNiFe/CNFs)were synthesized controllably by in-situ growth and cation etching.Electrochemical tests indicated that CoNiFe/CNFs exhibited excellent bifunctional performances in both oxygen evolution reaction(OER)and oxygen reduction reaction(ORR).Using CoNiFe/CNFs as bifunctional catalysts,the assembled ZABs presented ultralong durability up to 1050 and 660 h at 5 and 25 mA cm^(-2),respectively.The assembled flexible solid-state ZABs-based polyacrylamide(PAM)hydrogel exhibited a power density of 62.9 mW cm^(-2) and 66 h durability at 2 mA cm^(-2) under ultralow temperature of -40℃.The excellent performance of CoNiFe/CNFs was ascribed to the encapsulation of CNFs by the alloy NPs and the synergy of multi-metals in the alloy NPs,because the encapsulation could suppress alloy spillage and agglomeration and protect the catalytic sites from electrolyte deterioration,thereby boosting the durability of the resulting ZABs.

关 键 词：rechargeable Zn-air battery bifunctional catalyst CoNiFe alloy encapsulation effect long-term stability -40℃ultralow temperature 

分 类 号：O643.36[理学—物理化学] TB383[理学—化学]