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

Journal Article · · Journal of Power Sources
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. In conclusion, 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.
Research Organization:
Lawrence Berkeley National Laboratory, Berkeley, CA (United States). National Energy Research Scientific Computing Center (NERSC)
Sponsoring Organization:
USDOE Office of Science (SC), Advanced Scientific Computing Research (ASCR); USDOE Office of Science (SC), Basic Energy Sciences (BES). Scientific User Facilities (SUF); National Science Foundation (NSF); National Natural Science Foundation of China (NSFC); Natural Science Foundation of Jiangsu Province
Grant/Contract Number:
AC02-05CH11231
OSTI ID:
1463692
Alternate ID(s):
OSTI ID: 1549706
Journal Information:
Journal of Power Sources, Journal Name: Journal of Power Sources Journal Issue: C Vol. 363; ISSN 0378-7753
Publisher:
ElsevierCopyright Statement
Country of Publication:
United States
Language:
English

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