Palladium Modified FeCoS₂ Nanosheet Arrays on Ni Foam as Bifunctional Electrodes for Overall Alkaline Water Splitting

The development of high-efficient electrocatalysts with low applied voltage and robust stability is of great importance for electrolysis of water. In this work, a bifunctional electrode has been developed by growing palladium-modified FeCoS2 nanosheet arrays on Ni foam (Pd-FeCoS2 NAs/NF), which can serve as anode and cathode for alkaline water splitting with high activities and ultra-strong durability. The Pd-FeCoS2 NAs/NF shows overpotentials of 130 mV for hydrogen evolution reaction (HER) and 202 mV for alkaline oxygen evolution reaction (OER) at 10 mA cm(-2). The alkaline electrolyzer is built by employing Pd-FeCoS2 NAs/NF as cathode and anode, delivering a current density of 50 mA cm(-2) at 1.59 V. Moreover, the electrolyzer can run stably for 600 h with negligible decline.