Influence of the Oxide Content in the Catalytic Power of Raney Nickel in Hydrogen Generation |
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| Authors: | Dario Delgado Manickam Minakshi Dong-Jin Kim Chung Kyeong W |
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| Institution: | 1. School of Engineering and Information Technology, Murdoch University, Murdoch, Australiadario.delgado@hotmail.com;3. School of Engineering and Information Technology, Murdoch University, Murdoch, Australia;4. Mineral Resources Research Division, Korea Institute of Geoscience and Mineral Resources, Daejeon, South Korea |
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| Abstract: | The influence of oxides in the hydrogen evolution on Raney nickel electrocatalysts was characterized by electrochemical impedance measurements. In addition, these materials show competitive overpotentials for hydrogen evolution with a modified Watts bath as a binder for the Raney nickel. The optimum result was ?190?mV of overpotential at 100?mA?cm?2. Oxygen in the Raney Ni catalyst affects its electroactivity toward hydrogen evolution. The source of oxygen is related to the presence of chloride ions in the modified Watts bath. A Watts bath binds Raney Ni particles to the surface of the catalysts and chloride regulates the oxygen content in the nickel binder during electrodeposition. High oxygen content increases the hydrogen evolution overpotential of the electrode. The electroactivity of the synthesized porous coatings was evaluated by polarization curves and impedance plots. In addition, surface characterization by X-ray diffraction, field emission–scanning electron microscopy equipped with energy-dispersive analysis, and X-ray photoelectron spectroscopy is reported. |
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| Keywords: | Electrochemical impedance spectroscopy (EIS) energy-dispersive spectroscopy (EDS) field emission–scanning electron microscopy (FE-SEM) hydrogen evolution reaction (HER) X-ray diffraction (XRD) X-ray photoelectron spectroscopy (XPS) |
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