Journal
INTERNATIONAL JOURNAL OF HYDROGEN ENERGY
Volume 25, Issue 7, Pages 621-626Publisher
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/S0360-3199(99)00084-1
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This work describes the development of a composite material, NiFeZn coatings, prepared from the electrodeposition of NiFeZn alloys followed by chemical leaching in KOH solution. A sulphate bath was used to electrodeposit the NiFeZn alloys (55, 1, 44% in atoms, respectively) on a mild steel substrate. The evaluation of this material as electrocatalyst for the hydrogen evolution reaction was carried out in alkaline solutions through steady-state polarization curves. The long term operation at 135 mA cm(-2) showed good stability for up to 200 h. A positive aspect of this cathode is that the polarization behavior of the material shows one Tafel slope over the temperature range 25-80 degrees C. The operational potential of this material in 28% KOH at 80 degrees C is about 100 mV which is significantly lower than that of mild steel (400 mV). (C) 2000 International Association for Hydrogen Energy. Published by Elsevier Science Ltd. All rights reserved.
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