Electrochemical investigations on amorphous Fe-base alloys for alkaline water electrolysis |
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Authors: | Christian Immanuel Müller Thomas Rauscher Andreas Schmidt Thomas Schubert Thomas Weißgärber Bernd Kieback Lars Röntzsch |
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Affiliation: | 1. Fraunhofer Institute for Manufacturing Technology and Advanced Materials IFAM, Winterbergstr. 28, 01277 Dresden, Germany;2. Institute for Materials Science, Technische Universität Dresden, Helmholtzstr. 7, 01069 Dresden, Germany |
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Abstract: | In this work different amorphous melt-spun Fe-alloys (Fe82B18, Fe80Si10B10, Fe60Co20Si10B10) were investigated as cathode materials for the alkaline electrolysis of water. In particular, the influence of cobalt as well as the metalloids boron and silicon on the activity for the hydrogen evolution reaction (HER) was studied in 1 M KOH at 298 K using cyclic voltammetric, galvanostatic and polarization techniques. The electrocatalytic activity was evaluated in the view of the overpotential. It was found that cyclic voltammetric techniques can be used to activate the melt-spun Fe-alloys strongly. Different cyclic voltammetric activation procedures are discussed and the influence of the sweep rate and the potential window on the HER activity was elucidated. The experimental data indicate that the addition of metalloids and, most importantly, of cobalt improves the HER activity of the materials. Thus, the overpotential can be reduced by 200 mV compared to polycrystalline Ni. |
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Keywords: | Alkaline water electrolysis Cathode HER activity Melt-spun alloys Fe&ndash Co&ndash Si&ndash B |
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