This paper investigates the catalytic behavior of Sr2RuO4 bulk single crystals for hydrogen evolution reaction (HER). The crystals demonstrate remarkable activity under a current density of 1000 mA cm⁻², requiring overpotentials of 182 and 278 mV in 0.5 M H2SO4 and 1 M KOH electrolytes, respectively. The catalysts maintain stability for extended periods (up to 56 days) under high current densities and elevated temperatures (70 °C). In-situ formation of ferromagnetic Ru clusters on the crystal surface contributes to low charge transfer resistance and high wettability, facilitating rapid gas bubble removal. The findings highlight the potential of designing HER catalysts for industrial-scale applications.

Yudi Zhang, Kathryn E. Arpino, Qun Yang, Naoki Kikugawa, Dmitry A. Sokolov, Clifford W. Hicks, Jian Liu, Claudia Felser, Guowei Li