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Cyclic voltammograms of FTO (surface area: 0.0314 cm2) in a pH 6.8 phosphate buffer (0.1 M HPO42–/0.1 M H2PO4–) solution of varying (a) Ni2+ concentrations, (b) phosphate concentrations, and (c) scan rates (ν). (d) The surface-related reduction peak in the cyclic voltammogram.
