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. 2017 Feb 8;2(2):432–442. doi: 10.1021/acsomega.6b00448

Figure 6.

Figure 6

(a) Linear sweep voltammograms (scan rate: 20 mV/s) of BiVO4 (surface area: 0.27 cm2) in a pH 6.8 phosphate buffer (0.1 M HPO42–/0.1 M H2PO4–) solution containing Ni2+, with chopped UV–visible light irradiation (xenon lamp, 100 mW/cm2). (b) SECM chronoamperograms, collected in the TC/SG mode, measuring photoelectrochemical water oxidation on a BiVO4 substrate in a pH 6.8 phosphate buffer (0.1 M HPO42–/0.1 M H2PO4–) solution containing Ni2+ (bottom) and detection of the generated oxygen by a Au ring electrode (top). Measurements started in the dark, and UV–vis light irradiation started at 60 s and finished at 120 s.