CoFe alloy embedded in ultra-thin nitrogen-doped carbon nanosheets derived from CoFe LDH as efficient oxygen reduction electrocatalyst for Zn-air batteries  

作　　者：Peilin Liu Yuanqing Sun Jiaqing Luo Zehua Dong Peng Zhang Shaoming Zhong Yuechang Wei Weiyu Song Yu Wang Zhenxing Li Zhen Zhao Jian Liu 

机构地区：[1]State Key Laboratory of Heavy Oil Processing,China University of Petroleum,Beijing 102249,China [2]College of Science,Beijing Key Lab of Oil and Gas Optical Detection Technology,and Basic Research Center for Energy Interdisciplinary,China University of Petroleum,Beijing 102249,China [3]State Key Laboratory of Heavy Oil Processing at Karamay,China University of Petroleum Beijing at Karamay,Karamay 834000,China [4]Institute of Catalysis for Energy and Environment,College of Chemistry and Chemical Engineering,Shenyang Normal University,Shenyang 110034,China [5]Department of Chemistry,School of Science,Westlake University,Hangzhou 310024,China [6]Petrochemical Research Institute,PetroChina Company Limited,Beijing 102206,China

出　　处：《Nano Research》2025年第2期206-217,共12页纳米研究(英文版)

基　　金：The authors gratefully acknowledge the financial support from National Key Research and Development Program of China(No.2021YFA1501304);the National Natural Science Foundation of China(Nos.22035009 and 22122113)。

摘　　要：In response to alleviate the escalating environmental pollution and energy scarcity,the development of a cost-effective,efficient and stable bifunctional oxygen reduction reaction/oxygen evolution reaction(ORR/OER)electrochemical catalyst for new energy conversion devices holds significant value.In this context,we present a two-step hydrothermal/annealing synthesis approach of CoFe alloy nanoparticles on nitrogen-doped ultra-thin carbon nanosheets as an excellent ORR/OER bifunctional catalyst.The hydrothermal process facilitates the intercalation of CoFe layered double hydroxide(CoFe LDH)onto the nitrogen-doped ultra-thin carbon layer,followed by an in-situ transformation into carbon-coated nano-alloy particles(Co_(3)Fe_(7)@NCNS)during high-temperature annealing.Co3Fe7@NCNS exhibits exceptional ORR activity(onset potential(E_(onset))=0.962 V,half-wave potential(E_(1/2))=0.869 V)and bifunctional electrocatalytic performance,accompanied by a low reversible overvoltage of 0.82 V.Combining X-ray absorption fine structure(XAFS)spectroscopy and density functional theory(DFT)calculations,we elucidate that the strong interactions between the synthesized Co_(3)Fe_(7)@NCNS alloy particles optimize the adsorption energy of oxygen intermediates,thereby playing a crucial role in enhancing catalytic activity.Furthermore,the Co_(3)Fe_(7)@NCNS-equipped Zn air battery demonstrates a higher open-circuit voltage of 1.46 V and remarkable power density of 202.8 mW·cm^(-2).It also exhibits excellent cycling stability,with a high specific capacity of 779.2 mA·h·g^(-1),outperforming that of the Pt/C-RuO_(2) counterpart.

关 键 词：bifunctional catalyst CoFe alloy Zn-air battery nitrogen-doped carbon adsorption energy 

分 类 号：TM911.4[电气工程—电力电子与电力传动] O643.36[理学—物理化学] TB383[理学—化学]