Journal
CHEMELECTROCHEM
Volume 6, Issue 6, Pages 1738-1744Publisher
WILEY-V C H VERLAG GMBH
DOI: 10.1002/celc.201801790
Keywords
Mo-doped Cu; Co hybrid oxides; polycrystalline; hybrid crystal; amorphous structure; hydrogen evolution reaction
Categories
Funding
- National Natural Science Foundation of China [21571147, 51808414]
- China Postdoctoral Science Foundation [2017 M612520]
- Hubei Provincial Natural Science Foundation [2017CFB493, 2018CFB108]
- Foundation of Hubei Educational Committee [Q20171507]
- Graduate Innovation Fund of Wuhan Institute of Technology [CX2017148]
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To achieve a cost-effective and performance-enhanced electrocatalyst for the hydrogen evolution reaction (HER), Mo-doped Cu/Co hybrid oxides were prepared through the processes of hydrothermal chemistry and dehydration/reduction. Hybrid structures consisting of a polycrystalline hybrid crystal structure and an amorphous structure, and hybrid constituents including at least Cu, Cu2O, CuO, CoO, CuCoO2, and Cu2CoO3 were identified and characterized by using SEM, HR-TEM, XPS as well as electrochemical analysis. Interestingly, no information of the doped Mo appeared in the XRD patterns. The reasonable deduction is that Mo might be confined in the amorphous area. The highly developed interface, enhanced conductivity, larger active surface area, abundant oxygen vacancies, and redistribution of electrons among these elements resulted in the significantly enhanced electrocatalytic activity. The optimized Mo-doped hybrid Cu/Co oxide exhibited catalytic activity with an overpotential of 88 mV to obtain a current density of 10 mA cm(-2) in alkaline electrolyte with scarce loss of the initial catalyst activity for 28h and over 5000 cycles. This work may provide a channel to enhance the performance in the HER.
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