A study on the composite LaNi5/Ni–S alloy film used as HER cathode in alkaline medium

By molten salt electrolysis combined with aqueous electrodeposition, the composite LaNi5/Ni–S film with high stability and hydrogen evolution reaction (HER) activity was obtained. LaNi5 film was prepared by galvanostatic electrolysis at 100 mA cm−2 under 1273 K. The results showed that the composite LaNi5/Ni–S film (η150 = 75 mV, 353 K) could absorb large amount of H atoms, which not only increase its electrochemical activity, but also could be oxidized and avoid the dissolution of the Ni–S film under the state of open-circuit effectively and prolong the lifetime of the cathode.