Carbon nitride supported V-doped RuO2 catalyst for highly efficient acidic oxygen evolution reaction

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Vanadium-doped Ruthenium dioxide (V-RuO 2 ) integrated on graphitic carbon nitride (g-C 3 N 4 ) substrate (V-RuO 2 /g-C 3 N 4 ) is prepared via a facile hydrothermal reaction coupled with a subsequent calcination treatment. Results indicate the layered structure of g-C 3 N 4 provides substantial specific surface areas for the confined growth and dispersion of V-RuO 2 nanoparticles. There is significant electronic interaction and charge redistribution between the V-RuO 2 active species and the g-C 3 N 4 support. The optimal V-RuO 2 /g-C 3 N 4 -2 catalyst exhibited outstanding catalytic activity for oxygen evolution reaction (OER) in 0.5 M H 2 SO 4 electrolyte, requiring an overpotential of only 160 mV at a current density of 10 mA cm −2 , with a Tafel slope of 51.30 mV dec −1 , significantly lower than that of commercial RuO 2 . Moreover, the catalyst exhibits exceptional durability for 100 h of continuous operation at a current density of 20 and 100 mA cm −2 with no significant performance degradation, respectively. The Ru content in V-RuO 2 /g-C 3 N 4 -2 catalyst is merely 0.153 mg/cm 2 , demonstrating a robust mass activity of 349.35 mA mg Ru −1 . This study provides a viable strategy for developing advanced precious-metal-based acidic oxygen evolution catalysts for sustainable energy conversion technologies.