Abstract
A critical step in realizing the vision of green hydrogen through water splitting is to design oxygen evolution reaction (OER) catalysts that showcase a good balance of activity and stability. This work reports the compositional tuning of a NiMoO(4) material and then the subsequent varying of Ti(3)C(2)T (x) MXene with the NiMoO(4) hybrid nanostructures as OER catalysts in alkaline media. In this work, the optimum NiMoO(4) hybrid catalyst retained good stability over 24 h of chronopotentiometry on industrial relevant supports (Ni Felt) with an overpotential value of ca. 339 mV at 100 mA cm(-2). Operando Raman spectroscopy revealed that catalytically active β-NiOOH species are formed during OER in NiMoO(4) at lower overpotentials than for pure NiO and that a higher amount of the β-NiOOH was found in the 5% MXene loading. The ICP-OES analysis showed that Mo dissolution follows a volcano trend with MXene loading (peaking at 5 wt %) before decreasing at 10 wt %. Overall, these results hold great promises for rational design strategies for MXene-supported water oxidation catalysts in alkaline electrolytes.