High-Performance RuO x Catalyst with Advanced Mesoporous Structure for Oxygen Evolution Reaction.

Polymer electrolyte membrane water electrolysis (PEMWE) is regarded as one of the most important cornerstone technologies in the upcoming hydrogen society. However, one of the major problems it encounters is its slow oxygen evolution kinetics, which necessitates the use of large amounts of precious metal catalysts to ensure a satisfactory reaction rate. Herein, we have prepared a series of RuO with porous structures and ultrahigh Ru utilization toward the oxygen evolution reaction. All porous samples exhibit an enhanced catalytic performance compared with commercial RuO. Particularly, for the RuO-350 sample, the overpotential to reach 10 mA cm is as low as 225 mV. It has obvious advantages among all reported pure RuO-based catalysts. Here, a new strategy was raised to construct efficient RuO electrocatalysts with outstanding activity and stability for water electrolysis technology.