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Effect of Fe on hydrogen evolution performance of Ni-based Ni-S alloy coating electrode |
RAN Min, WU Yihui, HE Hanwei |
Powder Metallurgy Research Institute, Central South University, Changsha 410083, China |
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Abstract Ni-Fe-S three elemental alloy coating was prepared on nickel foil by electrodeposition method on the basis of preparation of Ni-S alloy electrode and adding ferrous sulfate into the bath. The electrode surface morphology, phase composition, and valence state of elements were respectively analyzed by scanning electron microscopy (SEM), X-ray diffraction (XRD) and X-ray photoelectron spectroscopy(XPS). The electro-catalytic hydrogen evolution performance and corrosion resistance of the coating electrode in KOH electrolyte were tested by electrochemical workstation, and compared with Ni-S alloy coating electrode. The results show that the surface of Ni-Fe-S coating electrode is composed of many tumor-like protrusions with rich surface structure, while the addition of Fe element can improve the amorphous degrees of alloy coating and corrosion resistance in alkaline electrolyte. Hydrogen evolution over potential of Ni-Fe-S electrode is reduced by 128 mV (36.6%) compared with Ni-S electrode. It indicates that Ni-Fe-S electrode has superior performance of catalytic hydrogen evolution.
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Received: 29 March 2017
Published: 11 July 2019
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