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

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

doi:10.11949/j.issn.0438-1157.20180759

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

更新时间：2025-12-10

- York-shell Co@Co-N/C of bifunctional oxygen electrocatalysts
- CIESC Journal Issue 11, Pages: 4702-4712(2018)
- 作者机构：
  
  化学工程联合国家重点实验室, 华东理工大学,上海,200237
- 作者简介：
- 基金信息：
- DOI：10.11949/j.issn.0438-1157.20180759
  CLC： Q028.8
- Online First：05 November 2018，
  
  Published：05 November 2018
- 稿件说明：
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SHUI Hengxin, PANFENG Hongkang, JIN Tian, et al. York-shell Co@Co-N/C of bifunctional oxygen electrocatalysts[J]. CIESC Journal, 2018, (11): 4702-4712.
DOI：

SHUI Hengxin, PANFENG Hongkang, JIN Tian, et al. York-shell Co@Co-N/C of bifunctional oxygen electrocatalysts[J]. CIESC Journal, 2018, (11): 4702-4712. DOI： 10.11949/j.issn.0438-1157.20180759.

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。

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.

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