fig6

Figure 6. Photoelectrocatalytic hydrogen production. (A) Schematic representation of the principle of photoelectrocatalysis; (B) LSV curves obtained for BiVO₄ and BiVO₄/Co₃O₄ in 0.5 M Na₂SO₄ under dark and light illumination; (C) Schematic illustration of charge transfer within BiVO₄/Co₃O₄ p-n junction photoanode during overall photoelectrocatalytic water splitting. Figure B and C are quoted with permission from Murugan et al.^[44]; (D) Schematic diagram of photoelectrocatalytic water splitting over Mo:BiVO₄/NiOx/CPF-TCzB/NiCoBi; (E) PEC performance of different samples; (F) Energy band diagrams of Mo:BiVO₄, NiO_x, and CPF-TCzB. Figure D-F are quoted with permission from Wang et al.^[45]; (G) Gibbs free energy for hydrogen generation over the n⁺p-Si/Ti/WO₃@RuSe₂, n⁺p-Si/Ti/RuSe₂, n⁺p-Si/Ti/WO₃, and bare n⁺p-Si/Ti; (H) Possible E_g optimization mechanism (E_CB: conduction band, E_VB: valence band). Figure G and H are quoted with permission from Zhang et al.^[46]; (I) Hydrogen production over fabricated STO@Fe NR photocatalyst with different concentrations of Sr. This figure is quoted with permission from Bashiri et al.^[47]. LSV: Linear sweep voltammetry; PEC: photoelectrochemical.