Yolk shell-structured pyrite-type cobalt sulfide grafted by nitrogen-doped carbon-needles with enhanced electrical conductivity for oxygen electrocatalysis

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外文摘要：Pyrite-type sulfides(PTS)exhibit promising intrinsic activities for oxygen reduction and evolution re-actions(ORR/OER).However,their poor electrical conductivities may limit the charge transfer rate to inevitably lower activity.Here,yolk-shell structured cobalt-pyrite nanospheres(CoS2 YSS)are prepared and modified with amino groups as nucleation sites for coupling highly-conductive needle-like nitrogen-doped carbon via a facile solvothermal method(CoS2 YSS@NC).The as-marked CoS2 YSS@NC-0.5 shows a gap between yolk and shell,and an obvious exterior layer of grafted NC,which can provide an inte-grated structure,an interior place,and three exposed surfaces on CoS2.CoS2 YSS@NC-0.5 reveals higher ORR activity(half-wave potential of 0.88 V)and methanol resistance than commercial Pt/C.Due to in-situ formation of highly-active CoOOH,CoS2 YSS@NC-0.5 shows a better overpotential(244mV at 10mA/cm2)and Tafel slope(135mV/dec)than RuO2.Zinc-air battery with CoS2 YSS@NC-0.5 air-cathode exhibits good open circuit potential(1.44 V),specific capacity(772.5 mAh/g)and cycling stability.Needle-like NC layer coated on the yolk-shell structure of CoS2 effectively lowers the charge transfer resistance to obtain ex-traordinary ORR/OER activities.It indicates that the integration of highly-conductive carbon onto pyrite-type sulfides is an effective strategy to acquire durable bifunctional ORR/OER catalysts.

外文关键词：

Cobalt sulfidesCycle stabilityElectrical conductivityPyriteYolk-shell structure

作者：

Jiahao Xie、Jin Liu、Bin Liu、Xin Meng、Zhuang Cai、Xiaoqin Xu、Cheng Wang、Shijie You、Jinlong Zou

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作者单位：

Key Laboratory of Functional Inorganic Material Chemistry,Ministry of Education of the People's Republic of China,School of Chemistry and Materials Science,Heilongjiang University,Harbin 150080,China

School of Chemical Engineering and Light Industry,Guangdong University of Technology,Guangzhou 510006,China

State Key Laboratory of Urban Water Resource and Environment,School of Environment,Harbin Institute of Technology,Harbin 150090,China

基金：

support by National Natural Science Foundation of Chinasupport by National Natural Science Foundation of ChinaOutstanding Youth Fund of Heilongjiang ProvinceLongJiang Scholars ProgramOpen Project of State Key Laboratory of Urban Water Resource and Environment,Harbin Institute of TechnologyGraduate Student Innovation Research Projects of Heilongjiang University

项目编号：

5207007421806031JQ2022E005Q201912HC202144YJSCX2022-219HLJU

出版年：

2024

DOI：

10.1016/j.cclet.2023.109236

中国化学快报(英文版)

中国化学会

中国化学快报(英文版)

CSTPCD

影响因子：0.771

ISSN：1001-8417

年,卷(期)：2024.35(7)