期刊
NANO ENERGY
卷 54, 期 -, 页码 129-137出版社
ELSEVIER
DOI: 10.1016/j.nanoen.2018.10.008
关键词
Cobalt doping; Ultrathin MnO2 nanosheets; Oxygen vacancies; Oxygen evolution reaction
类别
资金
- Australian Research Council (ARC) through the ARC Discovery project [DP160104340]
- Dongguan University of Technology (DGUT) for High-Level Talent Program [KCYKYQD2017015]
- China Postdoctoral Science Foundation [2017M622682]
- Research Start-up Funds of DGUT [GC300501-10]
- National Natural Science Foundation of China [51703028]
Developing low-cost and efficient catalysts for oxygen evolution reactions (OER) with both excellent activity and robust stability remains a great challenge. Herein, we report a facile spontaneous redox reaction to grow cobalt-doped MnO2 ultrathin nanosheets in situ with abundant oxygen vacancies vertically aligned on cobalt/nitrogen co-functionalized carbon nanofibers (Co-MnO2 vertical bar O-V) as an efficient OER catalyst. It is confirmed that metallic cobalt plays a critical role in the formation of long and ultrathin MnO2 nanosheets during the redox reaction. Furthermore, the cobalt ions doped into MnO2 significantly enhance the catalytic activity of MnO2 nanosheets. Benefiting from the collaborative advantages of doping strategy, fast charge transfer kinetics and strong synergistic coupling effects, Co-MnO2 vertical bar O-V composites exhibit an excellent catalytic activity and a good durability for electrochemical water oxidation, reaching 10 mA cm(-2) at an overpotential of 279 mV. According to the density functional theory (DFT) calculations, the enhanced catalytic activity mainly originates from a better conductivity and the decreased adsorption energy barrier of OH-on the O sites neighboring the doped Co and oxygen vacancies. Our findings suggest that the control over the structure and composition of the materials can achieve highly efficient oxygen evolution electrocatalysts.
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