期刊
APPLIED SURFACE SCIENCE
卷 505, 期 -, 页码 -出版社
ELSEVIER
DOI: 10.1016/j.apsusc.2019.144642
关键词
Dry synthesis; Oxygen evolution; Hydrogen evolution; 3-D carbon matrix; Nickel cobalt oxide
类别
资金
- Materials and Components Technology Development Program of KEIT [10053590]
- Korea Evaluation Institute of Industrial Technology (KEIT) [10053590] Funding Source: Korea Institute of Science & Technology Information (KISTI), National Science & Technology Information Service (NTIS)
The rational design of highly efficient bifunctional electrocatalysts for the oxygen and hydrogen evolution reactions is still an ongoing challenge. Herein, bimetallic transition metal oxide incorporated three-dimensional (3D) nitrogen-doped graphene/carbon nanotube (CNT) conducive matrix has been developed via dry synthesis and applied as a potential catalyst for the oxygen and hydrogen evolution reactions. The key features of the structure as well as its 3D network, nitrogen doping, and metal oxide formation were confirmed using various characterization techniques such as scanning electron and transmission electron microscopies, X-ray diffraction, and X-ray photoelectron spectroscopy. A nickel cobalt oxide-incorporated 3D nitrogen-doped graphene/CNT conducive matrix (NCGC) exhibits low overpotentials of 290 and 214 mV at 10 mA cm(-2) to drive the oxygen and hydrogen evolution reactions, respectively. Furthermore, the NCGC electrocatalyst maintains a reasonably long-term water electrolysis performance over 20 h, thought to be as a result of an improvement in the activity and stability of NCGC through the synergetic effects of the bimetallic transition oxide and 3D nitrogen-doped graphene/CNT. The overall electrochemical activity and stability of the prepared NCGC make it a good economical substitute for commercial noble metal-based catalysts for use in renewable energy production.
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