In-situ Generated Trimetallic Molybdate Nanoflowers on Ni Foam Assisted with Microwave for Highly Enhanced Oxygen Evolution Reaction.

Oxygen evolution reaction (OER) is considered as a critical half-cell reaction of water splitting, whose kinetic is sluggish even not favored, thus requiring highly active electrocatalysts to shrink the reaction energy barrier and improve the energy conversion efficiency. In this study, In-situ generated trimetallic molybdate nanoflowers on Ni foam by a straightforward and time-saving solvothermal method assisted with microwave, can not only bring synergistic effect into full play between multiple metals, but also construct a well-defined nanoflower-like structure accompanied by larger specific area (273.3 m 2 g -1 ) and smaller size than the pristine NiMoO 4 . The resulting Ni 0.9 Al 0.1 MoO 4 -NF requires a relatively low overpotential of 266 mV for OER at 10 mA cm -2 , which outperforms commercial RuO 2 catalysts (274 mV). Such excellent performances compare favorably to most previously reported NiMoO 4 -based electrocatalysts for OER. This work not only supply a facile method to construct a well-defined nanoflower-like structure on foam, but also broaden our horizons into the mechanism of OER in alkaline condition.