CIESC Journal ›› 2018, Vol. 69 ›› Issue (11): 4702-4712.DOI: 10.11949/j.issn.0438-1157.20180759

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York-shell Co@Co-N/C of bifunctional oxygen electrocatalysts

SHUI Hengxin, PANFENG Hongkang, JIN Tian, HU Jun, LIU Honglai   

  1. State Key Laboratory of Chemical Engineering, East China University of Science and Technology, Shanghai 200237, China
  • Received:2018-07-09 Revised:2018-09-28 Online:2018-11-05 Published:2018-11-05
  • Supported by:

    supported by the National Basic Research Program of China (2015BAC04B01) and the National Natural Science Foundation of China (21676080, 21878076).

双功能yolk-shell钴@钴氮碳掺杂氧电极催化剂

水恒心, 潘冯弘康, 金田, 胡军, 刘洪来   

  1. 化学工程联合国家重点实验室, 华东理工大学, 上海 200237
  • 通讯作者: 胡军, 刘洪来
  • 基金资助:

    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)。

Abstract:

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, Co2+ 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/cm2, and the Tafel slope was 71 mV/dec. More importantly, the total oxygen electrocatalytic activity was as low as 0.82 V.

Key words: 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Co2+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@Co-N/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 mA/cm2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。

关键词: 电化学, 催化剂, 纳米结构, 钴氮碳掺杂氧电极, ZIF-67

CLC Number: