| Ni-Co/RuO2复合电极的制备及其电催化析氢性能 |
| Preparation of Ni-Co/RuO2 Composite Electrode and Electrocatalytic Activity for Hydrogen Evolution |
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| 摘要: 采用快速凝固结合去合金化的方法制备纳米多孔Ni-Co合金，利用RuO2对Ni-Co合金进行表面修饰，通过X射线衍射（XRD）、X射线光电子能谱（XPS）、扫描电子显微镜（SEM）、透射电子显微镜（TEM）对多孔材料进行物相分析和形貌表征，并通过线性扫描伏安法、多电位阶跃法、交流阻抗法和恒电流电解法测试多孔电极的电催化析氢性能。结果表明，Ni-Co/RuO2复合电极材料在50 mA·cm-2电流密度下析氢过电位为180 mV，析氢过程由Volmer-Heyrovsky步骤控制，交换电流密度为4.42 mA· cm-2，经10 h恒电流电解后电位仅增加20 mV，表现出良好的析氢稳定性。 |
| 关键词: 去合金化 Ni-Co/RuO2复合电极 电催化析氢 |
| 基金项目: 国家自然科学基金（No.51661018）资助项目。 |
| 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 |
| 投稿时间：2019-06-21 修订日期：2019-10-07 |
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| 周琦,段德东,冯基伟.Ni-Co/RuO2复合电极的制备及其电催化析氢性能[J].无机化学学报,2019,35(12):2301-2310. |
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