Tuning active sites on cobalt/nitrogen doped graphene for electrocatalytic hydrogen and oxygen evolution

被引：62

作者：

Zhang, Yijie ^{[1
]}

Li, Wanfei ^{[2
]}

Lu, Luhua ^{[1
,3
]}

Song, Weiguo ^{[4
,5
]}

Wang, Chunru ^{[4
,5
]}

Zhou, Lisha ^{[2
]}

Liu, Jinghai ^{[6
]}

Chen, Ying ^{[1
]}

Jin, Hongyun ^{[1
]}

Zhang, Yuegang ^{[2
,7
]}

机构：

[1] China Univ Geosci, Fac Mat Sci & Chem, Wuhan 430074, Hubei, Peoples R China

[2] Chinese Acad Sci, Suzhou Inst Nanotech & Nanobion, Suzhou 215123, Peoples R China

[3] China Univ Geosci, Zhejiang Inst, Hangzhou 311305, Zhejiang, Peoples R China

[4] Chinese Acad Sci, Inst Chem, Lab Mol Nanostruct & Nanotechnol, Beijing 100190, Peoples R China

[5] Beijing Natl Lab Mol Sci, Beijing 100190, Peoples R China

[6] Inner Mongolia Univ Nationalities, Natl Expt Teaching Demonstrat Ctr Chem, Inner Mongolia Key Lab Carbon Nanomat, Tongliao 028000, Peoples R China

[7] Tsinghua Univ, Dept Phys, Beijing 100084, Peoples R China

来源：

ELECTROCHIMICA ACTA | 2018年 / 265卷

基金：

中国国家自然科学基金;

关键词：

Hydrogen evolution reaction; Oxygen evolution reaction; Atomic dispersed cobalt; Nitrogen doped graphene; BIFUNCTIONAL ELECTROCATALYSTS; COBALT NANOPARTICLES; CARBON NANOTUBES; EFFICIENT CATALYSIS; REDUCTION; OXIDE; METAL; NANOSHEETS; CARBIDE; HYBRID;

D O I：

10.1016/j.electacta.2018.01.203

中图分类号：

O646 [电化学、电解、磁化学];

学科分类号：

081704 ;

摘要：

Atomically dispersed metals and their environments strongly influence their electrocatalytic activities. In this work, we synthesized a series of cobalt/nitrogen doped graphene (Co-NG) catalysts. Cobalt atom dispersion and aggregation on NG's basal plane, bond states of cobalt and nitrogen along with graphene basal plane defect and their impacts on hydrogen evolution reaction (HER) and oxygen evolution reaction (OER) activities and kinetics were intensively studied. We found that a geometrically controlled formation of active Co-N and Co-C sites in the NG's basal plane is the key issue for improving interfacial Faradic reaction kinetics and thus enhancing hydrogen evolution. Differently, chemical bonding of finely dispersed cobalt atoms with oxygen, nitrogen and carbon together improves interfacial water oxidation kinetics for achieving high OER activity. (C) 2018 Elsevier Ltd. All rights reserved.

引用

页码：497 / 506

页数：10

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