Heterointerface of Nickel-ferric Hydroxide/Cobalt-phosphide-boride Boosting Hydrazine-assisted Water Electrolysis

Sustainable H₂ production based on hydrogen evolution reaction (HER) and hydrazine oxidation reaction (HzOR) has attracted wide attention due to minimal energy consumption compared to overall water electrolysis. The present study focuses on the design and construction of heterostructured CoPB@NiFe-OH applied as efficient bifunctional catalysts to sustainable produce hydrogen and remove hydrazine in alkaline media. Impressively, CoPB@NiFe-OH heterointerface exhibits an HzOR potential of -135 mV at the current density of 10 mA cm^-2 when the P to B atom ratio was 0.2, simultaneously an HER potential of -32 mV toward HER when the atom ratio of P and B was 0.5. Thus, hydrogen production without an outer voltage accompanied by a small current density output of 25 mA cm^-2 is achieved, surpassing most reported catalysts. In addition, DFT calculations demonstrate the Co sites in CoPB upgrades H^* adsorption, while the Ni sites in NiFe-OH optimizes the adsorption energy of N₂H₄^* due to electron transfer from CoPB to NiFeOH at the heterointerface, ultimately leading to exceptional wonderful performance in hydrazine-assistant water electrolysis via HER coupled with HzOR.