Facing Seawater Splitting Challenges by Regeneration with Ni <i>?</i> Mo <i>?</i> Fe Bifunctional Electrocatalyst for Hydrogen and Oxygen Evolution

Hydrogen, produced by water splitting, has been proposed as one of the main green energy vectors future if from renewable sources. However, to substitute fossil fuels, large amounts pure are necessary, scarce in many world regions. In this work, we fabricate efficient and earth-abundant electrodes, study challenges using real seawater, propose an electrode regeneration method face undesired salt deposition. Ni-Mo-Fe trimetallic electrocatalyst is deposited on non-expensive graphitic carbon felts both for hydrogen (HER) oxygen evolution reactions (OER) seawater alkaline seawater. Cl- pitting chlorine oxidation reaction suppressed these substrates alkalinized electrolyte. Precipitations mainly CaCO3 , originating seawater-dissolved components have studied, a simple technique rapidly dissolve acidified Under conditions, Ni-Mo-Fe-based catalyst found reconfigure, under cathodic bias, into alloy with cubic crystalline structure Ni : Fe(OH)2 redeposits whereas, anodic it transformed follicular Ni:FeOOH structure. High productivities over 300 mA cm-2 voltages down 1.59 V@10 overall splitting shown, electrodes stable 24 h without decay conditions efficiency higher than 61.5 % which makes promising economically feasible.