【摘要】 采用电沉积方法在Cu基体上制备出Ni-Mo-Co三元合金电极,主要研究了沉积电流对Ni-Mo-Co合金电极析氢催化活性的影响。采用扫描电子显微镜和X射线衍射技术分别研究了Ni-Mo-Co合金镀层的表面形貌、元素组成和晶体结构,采用稳态极化曲线和交流阻抗技术研究了Ni-Mo-Co合金电极在30%KOH溶液中的析氢催化性能。结果表明:电沉积Ni-Mo-Co合金外观呈银白色,表面光滑细致,为非晶态结构。合金电极的析氢催化性能随着沉积电流的增大表现为先升高后降低的趋势,当沉积电流密度为15 mA.cm-2时,获得合金镀层具有最低的析氢过电位η100=139 mV,显示出良好的析氢催化活性。其析氢反应为Volmer-Heyvosky反应机制,主要受电化学脱附步骤控制。更多还原

【Abstract】 Ternary Ni-Mo-Co coated electrodes were prepared by chemical electrodeposition method on the copper matrix,and the effect of deposition current on electrocatalytic properties of Ni-Mo-Co alloy electrodes for hydrogen evolution was researched.The surface morphology,element composition and microstructure of Ni-Mo-Co alloy coatings were investigated by scanning electron microscope(SEM) and X-ray diffraction(XRD).The electrocatalytic properties of the obtained coatings for hydrogen evolution were studied in 30%KOH solution by potentiostatic polarization and electrochemical impedance spectroscopy(EIS) techniques.The results showed that the alloy coating was silver-white,smooth,and the structure was amorphous.The electrocatalytic activity of the coated electrodes enhanced first and then declined with the increase of deposition current density.When the deposition current density was 15 mA·cm-2,the obtained Ni-Mo-Co coating had the lowest overpotential value of about η100=139 mV,which showed better electrocatalytic activity for hydrogen evolution.That hydrogen evolution reaction of such electrodes conformed to the Volmer-Heyvosky reaction mechanism.And the electrochemistry desorption process was the control step.更多还原