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| Preparation of Ni-Co/RuO2 Composite Electrode and Electrocatalytic Activity for Hydrogen Evolution |
| Author Name | Affiliation | E-mail | | ZHOU Qi | State Key Laboratory of Advanced Processing and Recycling of Nonferrous Metals, Lanzhou University of Technology, Lanzhou 730050, China
College of Materials Science and Engineering, Lanzhou University of Technology, Lanzhou 730050, China | zhouxq301@sina.com | | DUAN De-Dong | College of Materials Science and Engineering, Lanzhou University of Technology, Lanzhou 730050, China | | | FENG Ji-Wei | College of Materials Science and Engineering, Lanzhou University of Technology, Lanzhou 730050, China | |
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| Abstract: Nanoporous Ni, Co and Ni-Co alloys were prepared by rapid solidification combined with de-alloying. The surface of Ni-Co alloy was modified by RuO2. The phase analysis and morphology of porous materials were characterized by X-ray diffraction (XRD), X-ray photoelectron spectroscopy (XPS),scanning electron microscope (SEM) and transmission electron microscope (TEM). The electrocatalytic hydrogen evolution performance of the porous electrode was tested by linear sweep voltammetry, multi-potential step, alternating current impedance and potentiostatic electrolysis. The results show that the Ni-Co/RuO2 composite electrode material has a hydrogen evolution overpotential of 180 mV at a current density of 50 mA·cm-2. The hydrogen evolution process was controlled by the Volmer-Heyrovsky step, and the exchange current density was 4.42 mA·cm-2. Compared with nanoporous Ni, nanoporous Co and nanoporous Ni-Co alloy, Ni-Co/RuO2 composite electrode had the lowest apparent activation energy during hydrogen evolution. After 10 h constant current electrolysis, the potential only increased by 20 mV, showing excellent hydrogen evolution stability. |
| Keywords: de-alloying Ni-Co/RuO2 composite electrode electrocatalytic hydrogen evolution |
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| ZHOU Qi,DUAN De-Dong,FENG Ji-Wei.Preparation of Ni-Co/RuO2 Composite Electrode and Electrocatalytic Activity for Hydrogen Evolution[J].Chinese Journal of Inorganic Chemistry,2019,35(12):2301-2310. |
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