Isolated Co Atoms Anchored on Defective Nitrogen-doped Carbon Graphene as Efficient Oxygen Reduction Reaction Electrocatalysts

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外文摘要：Oxygen reduction reaction(ORR)is the heart of many new energy conversions and storage devices,such as metal-air batteries and fuel cells.However,ORR is currently facing the dilemma of sluggish intrinsic kinetics and the noble electrocatalysts of high price and low reserves.In this work,isolated Co atoms anchored on defective nitrogen-doped carbon graphene single-atom catalyst(Co-SAC/NC)are synthesized via the proposed movable type printing method.The prepared Co-SAC/NC catalyst demonstrates admirable ORR performance,with a high half-wave potential of 0.884 V in alkaline electrolytes and outstanding durability.In addition,an assembled zinc-air battery with prepared Co-SAC/NC as air-cathode catalyst displays a high-peak power density of 179 mW cm-2 and a high-specific capacity(757 mAh g-1).Density functional theory calculations confirm that the true active sites of the prepared catalyst are Co-N4 moieties,and further reveal a significantly electronic structure evolution of Co sites in the ORR process,in which the project density of states and local magnetic moment of Co atom varies during its whole reaction process.This work not only paves a new avenue for synthesizing SACs as robust electrocatalysts,but also provides an electronic-level insight into the evolution of the electronic structure of single-atom catalysts.

外文关键词：

movable type printing methodoxygen reduction reactionsingle-atom catalystzinc-air battery

作者：

Peng Rao、Junming Luo、Daoxiong Wu、Jing Li、Qi Chen、Peilin Deng、Yijun Shen、Xinlong Tian

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作者单位：

State Key Laboratory of Marine Resource Utilization in South China Sea,Hainan Provincial Key Lab of Fine Chemistry,School of Chemical Engineering and Technology,Hainan University,Haikou 570228,China

基金：

Hainan Province Science and Technology Special FundHainan Province Science and Technology Special Fund国家自然科学基金国家自然科学基金国家自然科学基金国家自然科学基金国家自然科学基金Postdoctoral Science Foundation of Hainan Provincespecific research fund of the Innovation Platform for Academicians of Hainan Provincespecific research fund of the Innovation Platform for Academicians of Hainan Provincespecific research fund of the Innovation Platform for Academicians of Hainan Provincespecific research fund of the Innovation Platform for Academicians of Hainan Provincespecific research fund of the Innovation Platform for Academicians of Hainan Provincespecific research fund of the Innovation Platform for Academicians of Hainan Provincespecific research fund of the Innovation Platform for Academicians of Hainan Province

项目编号：

ZDYF202003720202072180510422109034221090355216402862105083RZ2100007123KYQDZR-20008200822008320084210652112421125

出版年：

2023

DOI：

10.1002/eem2.12371

能源与环境材料(英文)

CSCD

ISSN：

年,卷(期)：2023.6(3)

参考文献量37