文献类型：期刊文献

中文题名：双功能yolk-shell钴@钴氮碳掺杂氧电极催化剂

英文题名：York-shell Co@Co-N/C of bifunctional oxygen electrocatalysts

作者：水恒心[1];潘冯弘康[1];金田[1];胡军[1];刘洪来[1]

机构：[1]化学工程联合国家重点实验室,华东理工大学,上海200237

年份：2018

卷号：69

期号：11

起止页码：4702

中文期刊名：化工学报

外文期刊名：CIESC Journal

收录：CSTPCD;;EI(收录号：20191006589296);Scopus;北大核心:【北大核心2017】；CSCD:【CSCD2017_2018】；

基金：国家重点基础研发计划项目(2015BAC04B01);国家自然科学基金项目(21676080,21878076)。

语种：中文

中文关键词：电化学;催化剂;纳米结构;钴氮碳掺杂氧电极;ZIF-67

外文关键词：electrochemistry;catalyst;nanostructure;Co-N/C composite electrocatalyst;ZIF-67

摘要：以ZIF-67为模板,通过表面原位聚合多巴胺,与金属Co^(2+)发生强烈螯合,释放出有机配体,得到中空的金属-有机结构材料(Co-PDA)。通过900℃高温处理得到类似蛋黄(yolk-shell)结构的金属氮掺杂碳材料(Co@CoN/C)。这种特殊结构的材料具有优异的氧还原(ORR)和析氧反应(OER)电催化活性,在0.1 mol/L KOH电解液中,其ORR的半波电位为0.81 V,Tafel斜率为60 mV/dec;在电流密度为10 m A/cm^(2)时,其OER过电位为390 mV,Tafel斜率为71 mV/dec,总的氧电极催化活性为0.82 V,是一种优良的双功能氧电极催化剂。
ZIF-67 was used as a template for producing metal and nitrogen doped carbon composite as electrocatalysts.By an in-situ polymerization of dopamine on the surface of ZIF-67,Co^(2+)ions were extracted into the polydopamine shell due to the strong chelation between them and led to the decomposition of ZIF-67,which resulted into a hollow composite of Co-PDA.Subsequently,a yolk-shell structure of metal and nitrogen doped carbon composites(Co@Co-N/C)was obtained by a high temperature pyrolysis at 900℃.The unique structure of Co@Co-N/C provided excellent bifunctional electrocatalysts for both oxygen reduction reaction(ORR)and oxygen evolution reaction(OER),repetitively.For ORR,the half-wave potential was 0.81 V and the Tafel slope was 60 mV/dec.For OER,the overpotential was 390 mV at the current density of 10 mA/cm^(2),and the Tafel slope was 71 mV/dec.More importantly,the total oxygen electrocatalytic activity was as low as 0.82 V.