Fig. 4: Standalone solar water splitting. | Nature Communications

Fig. 4: Standalone solar water splitting.

From: Cu2O photocathodes with band-tail states assisted hole transport for standalone solar water splitting

Fig. 4

a Plot of photon flux based on AM 1.5 G spectrum and expected electron fluxes of photocathode and PV calculated from wavelength-dependent IPCE responses of photocathode at 0.5 V versus RHE and PV at short circuit. b Illustration of PEC-PV tandem configuration based on CuSCN-incorporated Cu2O photocathode, PSC and IrOx anode. c J–E responses of transparent Cu2O photocathodes with various thicknesses. Numbers in sample names denote the electrodeposition duration of Cu2O in minutes. d Wavelength-dependent IPCE of transparent Cu2O photocathodes biased at 0.5 V versus RHE and corresponding transmittance spectra. e Estimated tandem operating current density by overlaying J–E curves of photocathodes, J–V curves of PV cells and linear-sweep voltammetry of IrOx anode. f Chronoamperometry of assembled PEC-PV tandem tested under simulated one-sun illumination in pH 5 buffered electrolyte with zero bias.

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