fig8

Figure 8. Synergistic catalysis for H₂ production. Schematic diagram of (A) energy band bending of catalyst and (B) carrier behavior within catalyst during piezo-photocatalysis. Figure A and B are quoted with permission from Han et al.^[58]; (C) Experimental and simulated piezo-photocatalytic H₂ production rate and selectivity of Pt/ZnIn₂S₄/BaTiO₃ heterojunctions, and (D) corresponding H₂ evolution mechanism. Figure C and D are quoted with permission from Wang et al.^[59]; (E) Schematic illustration of the piezopotential switch mechanisms, and (F) corresponding H₂ production rates under ultrasonication-light (U-L) and stirring-light irradiation (O-L) with the working current of 0.8 and 0.2 A, respectively. Figure E and F are quoted with permission from Jin et al.^[61]; (G) Schematic representative of the synergistic pyro-photocatalytic water splitting over BaTiO₃ photoanode, and (H) corresponding H₂/O₂ production under temperature fluctuation, light illumination, and an overpotential of 1.23 V vs. RHE. Figure G and H are quoted with permission from Guo et al.^[63]; (I) Hydrogen evolution rates, (J) electrochemical impedance spectroscopy Nyquist plots, (K) photocurrent outputs, and (L) pyroelectric potential outputs of P(VDF-HFP)/CNT/CdS-Pt (P-H/C/CdS-Pt), P(VDF-HFP)/CdS-Pt (P-H/CdS-Pt), P(VDF-CTFE)/CNT/CdS-Pt (P-C/C/CdS-Pt), and P(VDF-HFP)/CNT/CdS-Pt (P-C/CdS-Pt). Figure I-L are quoted with permission from Dai et al.^[7]; (M) Schematic representation of piezo-pyro-photocatalytic H₂ production in the condition of magnetic field stimulation, full-spectrum light irradiation, and (N) corresponding H₂ production rates of PVDF/Fe₃O₄/g-C₃N₄ (PVFC). Figure M and N are quoted with permission from Wei et al.^[64]. RHE: Reversible hydrogen electrode; PVDF: polyvinylidene fluoride.