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Nesting Co₃Mo Binary Alloy Nanoparticles onto Molybdenum Oxide Nanosheet Arrays for Superior Hydrogen Evolution Reaction
- Chen, Jiyi, Ge, Yuancai, Feng, Qianyi, Zhuang, Peiyuan, Chu, Hang, Cao, Yudong, Smith, William R., Dong, Pei, Ye, Mingxin, Shen, Jianfeng
- ACS applied materials & interfaces 2019 v.11 no.9 pp. 9002-9010
- active sites, alloy nanoparticles, alloys, annealing, catalysts, density functional theory, electrochemistry, foams, hydrogen production, molybdenum, nanosheets, nesting, nickel, temperature
- Transition-metal alloys have attracted a great deal of attention as an alternative to Pt-based catalysts for hydrogen evolution reaction (HER) in alkaline. Herein, a facile and convenient strategy to fabricate Co₃Mo binary alloy nanoparticles nesting onto molybdenum oxide nanosheet arrays on nickel foam is developed. By modulating the annealing time and temperature, the Co₃Mo alloy catalyst displays a superior HER performance. Owing to substantial active sites of nanoparticles on nanosheets as well as the intrinsic HER activity of Co₃Mo alloy and no use of binders, the obtained catalyst requires an extremely low overpotential of only 68 mV at 10 mA cm–² in alkaline, with a corresponding Tafel slope of 61 mV dec–¹. At the same time, the catalyst demonstrates excellent stability during the long-term measurements. The density functional theory calculation provides a deeper insight into the HER mechanism, unveiling that the active sites on the Co₃Mo-based catalyst are Mo atoms. This strategy of combining catalytic active species with hierarchical nanoscale materials can be extended to other applications and provides a candidate of nonnoble metal catalysts for practical electrochemical water splitting.