The presence of iron in the electrolyte has a significant impact on the performance of the electrodes in alkaline water electrolysis. For nickel-based anodes, the presence of iron is needed to achieve and maintain low overpotentials in the oxygen evolution reaction (OER). In contrast, in hydrogen evolution, the presence of iron can lead to deactivation of noble metal-based cathodes, which are more active than non-noble metal cathodes. Since the catholyte and anolyte can mix through the porous separator, stack developers need to decide on the optimal iron content in their system. It seems most promising to focus further development on the ‘iron-rich’ system, also considering the costs of construction materials and water purification.

中文翻译：

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碱性水电解：电解液中含铁还是不含铁？

电解液中铁的存在对碱性水电解中电极的性能有显着影响。对于镍基阳极，需要铁的存在才能在析氧反应（OER）中实现并维持低过电势。相反，在析氢过程中，铁的存在会导致贵金属阴极失活，而贵金属阴极比非贵金属阴极更具活性。由于阴极电解液和阳极电解液可以通过多孔分离器混合，因此电堆开发人员需要确定系统中的最佳铁含量。考虑到建筑材料和水净化的成本，似乎最有希望的是将进一步开发的重点放在“富铁”系统上。