Enhanced Surface Kinetics and Charge Transfer of BiVO4 Photoanodes by Rh2O3 Cocatalyst Loading for Improved Solar Water Oxidation

A Rh2 O3 /BiVO4 composite photoanode exhibits enhanced surface reaction kinetics and charge transfer efficiency, enabling a photocurrent density of ca. 3.5 mA/cm2 at 1.23 V (vs. RHE), which is about 3.89 times higher than that of the pristine BiVO4 , with a lower onset potential of 0.29 V (vs. RHE).