Fig. 7. (A) Linear scan voltammograms of WO3/BiVO4 as a working electrode, Cu2O
as a counter electrode in solution of 5.0 mg L−1 MB and 0.1 M Na2SO4 under dark
condition and light irradiation. (B) MB degradation profiles with different stages by
using Cu2O and that modified with Ag nanoparticles as a counter electrode.