Co,N-codoped graphene as efficient electrocatalyst for hydrogen evolution reaction: Insight into the active centre

JOURNAL OF POWER SOURCES

卷:363

Article

Wang, Shumin¹  Zhang, Lei²  Qin, Yong¹  Ding, Dong²  Bu, Yunfei¹  Chu, Fuqiang¹  Kong, Yong¹  Liu, Meilin² 

[1] Changzhou Univ, Jiangsu Key Lab Adv Catalyt Mat & Technol, Sch Petrochem Engn, Changzhou 213164, Peoples R China

[2] Georgia Inst Technol, Sch Mat Sci & Engn, Atlanta, GA 30332 USA

关键词: Co,N-codoped graphene;    3D graphene;    Hydrogen evolution reaction;    Active centre;    Electrocatalyst;   

DOI  :  10.1016/j.jpowsour.2017.07.107

来源: Elsevier

【 摘 要 】

Co and N co-doped carbon (CNC) material is one of the most promising precious-metal-free catalyst for hydrogen evolution reaction (HER), however, widespread application of CNC will require continuous innovation and optimization of fabrication to maximize electrocatalytic performance, which is always a challenge. Herein, two types of three-dimensional (3D) graphene materials synthesized by one-step of simultaneous doping (Co,N/3DG-1) and two-step of sequential doping (Co,N/3DG-2) respectively, are evaluated and correlated their electrocatalytic activity for HER with experimental parameters. The results indicate that Co,N/3DG-2 exhibits significantly better electrocatalytic activity than Co,N/3DG-1. The structure analysis reveals that Co,N/3DG-2 has more moderate Co-N coordinated number than Co,N/3DG-1. Density functional theory calculations unravels that the equilibrium C and N around Co atom is more favorable to the adsorption and desorption of hydrogen. The results shed new light on the rational design of dual hetero-atom co-doped carbon materials, which may be applicable to other energy conversion and storage systems. (C) 2017 Elsevier B.V. All rights reserved.

【 授权许可】

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