Mo-Guided Self-Reconstructed Highly Active NiOOH Catalyst for Durable Alkaline Oxygen Evolution Reaction

Abstract

Alkaline water electrolysis (AWE) is vital for green hydrogen production but suffers from sluggish oxygen evolution reaction (OER) kinetics and poor electrode stability. Here, a facile and feasible Mo-guided self-reconstruction strategy was developed to construct outstanding pure nickel-based OER electrocatalyst (γ-NiOOHMo-SR/NF). Benefiting from the in situ generated abundant high-valent Ni sites and interfacial hydrogen-bonding network, γ-NiOOHMo-SR/NF showed excellent OER activity and impressive long-term stability over 1,100 h at 1.0 A cm-2, even exceeded 100 h at 3.0 A cm-2, outperforming most reported non-precious metal catalysts. In situ spectroscopic studies confirmed that the interfacial hydrogen-bonding network promoted OH- transport and suppresses local acidification, thereby endowed γ-NiOOHMo-SR/NF superior OER performance. The present work is instructive for designing of highly efficient Ni-based OER electrocatalysts.