Methodology of accelerated testing of electrode materials based on Zn-Ni-Cu alloys for alkaline water electrolysis with the possibility of their regeneration
DOI:
https://doi.org/10.29114/ajtuv.vol9.iss1.330Keywords:
Zn-Ni-Cu alloy, multilayer coatings, catalytic activity, hydrogen evolution, resistance to degradationAbstract
The method of accelerated tests of degradation resistance of electrodes based on Zn-Ni-Cu alloys, which simulates the operation of electrodes under the conditions of periodic changes in the load on the electrolyzer of alkaline water electrolysis is provided. It was found that during multicycling of electrodes using quasi-stationary cyclic polarization curves in the range of hydrogen evolution potentials on a multilayer electrode with alternating layers of alloys and a mixture of metals with hydroxides, the overvoltage of hydrogen evolution decreases, in contrast to a single-layer electrode, the surface of which is modified under such conditions with increasing overvoltage of hydrogen evolution. This is due to both the different degree of surface development due to the leaching of zinc from the phases of the alloy enriched with it, and to another change in the phase composition of the surface layer of the coating. In the process of long-term cycling, the corrosion potential of coatings becomes more negative, and the rate of corrosion increases. After the regeneration of the surface and repeated cycling, the activity of the electrodes is still preserved: in comparison with the initial state, there remains a decrease in the overvoltage of hydrogen evolution reaction both on a single-layer electrode (by 0.3-4.3%), and on a multilayer one (by 13.6-23.9 %). Moreover, the exchange current density of hydrogen evolution reaction increases by 2.4 times in the case of a single-layer electrode and by 1.7 times in the case of a multilayer electrode.
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