Fig. 4: J–V plots measured in borate buff er under front illumination.

J–V plots measured in borate buffer under (front) illumination for comparing (a) cocatalysts on bare BiVO₄ and b co-catalysts on NN BiVO₄/WO₃ Heterojunctions, c compilation of onset potential and current density at 1.23 V_RHE for the samples in a, b.