Mechanism conversion and accelerated deprotonation of RuO2-GO catalyst to promote acidic oxygen evolution reaction

The traditional oxygen evolution reaction (OER) usually uses RuO2 catalyst as the benchmark, but has always faced the problem of not being able to simultaneously achieve low overpotential and long-term stability under high current density. Here, we use the in-situ electrochemical coating method to coat graphene oxide (GO) on RuO2 catalyst. The results indicate that changing the in-situ coating amount of GO on RuO2 catalyst activates the redox ability of lattice oxygen. Realize the transition from the adsorbate precipitation mechanism (AEM) reaction mechanism to the lattice oxygen mediated mechanism (LOM) reaction mechanism, and accelerate the deprotonation step. The optimized RuO2-1%GO catalyst has a low overpotential (180 mV at 10 mA cm−2) and excellent catalytic stability (300 h at 100 mA cm−2).