RuO2 nanoparticle-decorated TiO2 nanobelt array as a highly efficient electrocatalyst for the hydrogen evolution reaction at all pH values

Abstract

Water electrolysis is a highly appealing route for producing clean hydrogen, but it demands high-efficiency and durable catalysts for the hydrogen evolution reaction (HER) at all pH values. Herein, we report that a RuO₂ nanoparticle-decorated TiO₂ nanobelt array supported on a titanium plate acts as a highly active and robust catalyst for the HER. In acidic media, it only requires overpotentials of 130 and 166 mV to attain current densities of 100 and 200 mA cm⁻², respectively, and achieves a stable 24 h of electrolysis under a static overpotential of 130 mV. Furthermore, the catalyst also displays attractive HER activity and stability in both alkaline and neutral media. Theoretical calculations further reveal the catalytic mechanisms involved.