Generation of Stable Photovoltage in Nonstoichiometric CuBi₂O₄ Thin-Film Photocathodes

Figure 3

(a) Tauc plots obtained from UV-Vis absorbance spectra (inset) and (b) linear sweep voltammetry scans of CuBi₂O₄ (thickness ~800 nm) thin-film photocathodes. Inset: Enlarged dark current regions from 0.3 to 0.5 . Dashed lines and solid lines represent dark-current density and photocurrent density, respectively. (c) Chopped chronoamperometry measurements of CuBi₂O₄ thin-film photocathodes at a potential of 0.3 . These measurements were performed in a 0.1 M KPi buffered solution as the electrolyte without H₂O₂ scavengers.

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