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Lamellar-stacked cobalt-based nanopiles integrated with nitrogen/sulfur co-doped graphene as a bifunctional electrocatalyst for ultralong-term zinc-air batteries

查看全文 作　　者：Lingxue [1]Meng;Wenwei [1]Liu;Yang [3]Lu;Zhenyi [1]Liang;Ting [4]He;Jinying [1]Li;Haoxiong [1]Nan;Shengxu [1]Luo;Jia [2]Yu 高影响力作者 机构地区：[1]School of Science,Hainan University,Haikou 570228,Hainan,China;[2]Materials Genome Institute,Shanghai University,Shanghai 200444,China;[3]Beijing Key Laboratory of Green Chemical Reaction Engineering and Technology,Department of Chemical Engineering,Tsinghua University,Beijing 100084,China;[4]Department of Chemistry,College of Sciences,Shanghai University,Shanghai 200444,China高影响力机构 出　　处：《Journal of Energy Chemistry》索引2023年第6期,共10页高影响力期刊 基　　金：supported by the National Natural Science Foundation of China (21905157,22279077,21905056);the Hainan Provincial Natural Science Foundation of China (221RC452);the Start-up Research Foundation of Hainan University (KYQD (ZR)21059,KYQD (ZR)-21063);the Natural Science Foundation of Shanghai (22ZR1424500)。 摘　　要：Sluggish oxygen evolution reaction(OER)and oxygen reduction reaction(ORR)kinetics inevitably impede the practical performance of rechargeable zinc-air batteries.Thus,combing the structural designability of transition metal-based electrocatalysts with anionic regulation is highly desired.Herein,mesoporous lamellar-stacked cobalt-based nanopiles with surface-sulfurization modification are elaborately designed and integrated with N/S co-doped graphene to build a robust OER/ORR bifunctional electrocatalyst.The lamellar-stacking mode of mesoporous nanosheets with abundant channels accelerates gas-liquid mass transfer,and partial-sulfurization of cobalt-based matrix surface efficiently improves the intrinsic OER activity.Meanwhile,N/S co-doped graphene further reinforces the ORR active sites while providing a stable conductive skeleton.As expected,this composite electrocatalyst delivers considerable bifunctional activity and stability,with an OER overpotential of 323 m V at 10 m A cm^(-2)and high durability.When applied in zinc-air batteries,remarkable ultralong-term stability over 4000 cycles and a maximum power density of 150.1 m W cm^(-2)are achieved.This work provides new insight into structurecomposition synergistic design of rapid-kinetics OER/ORR bifunctional electrocatalyst for nextgeneration metal-air batteries. 关 键 词：Lamellar-stacking nanopile Co_(3)O_(4) Anionic regulation Oxygen evolution reaction Oxygen reduction reaction Zinc–air battery
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