Low Ru loading RuO2/(Co,Mn)3O4 nanocomposite with modulated electronic structure for efficient oxygen evolution reaction in acid

Oxygen evolution reaction (OER) in acidic media usually requires a catalyst with high content of noble Ir or Ru, becoming a bottleneck for the electrochemical water splitting. To address this issue, here we report the fabrication of a RuO2/(Co,Mn)(3)O-4 nanocomposite with low Ru loading (2.51 wt%) as a highly efficient OER catalyst in acidic media (0.5 M H2SO4). Spectroscopic and theoretical studies demonstrate that the introduction of Mn in Co3O4 results in redistribution of electrons and the generation of electron-rich Ru species of the RuO2/(Co, Mn)(3)O-4 catalyst. With modulated electronic properties, the adsorption of O on RuO2/(Co,Mn)(3)O-4 is weakened and the rate determining step, formation of OOH*, of the OER process is therefore accelerated. At such a low Ru loading, RuO2/(Co,Mn)(3)O-4 exhibits superior acidic OER activity (eta = 270 mV at 10 mA/cm(2)) and long-term stability to the benchmark RuO2 catalyst. This work provides a new strategy for the design of cost-effective acidic OER electrocatalysts for energy conversion applications.

Automated summary

By preparing a RuO2/(Co,Mn)3O4 nanocomposite with low Ru loading, the catalytic activity and stability of oxygen evolution reaction in acidic media have been significantly improved. The catalyst shows high activity at 10 mA/cm(2), providing a new energy-efficient design strategy for energy conversion applications.