Fig. 3From: Efficiently Visible-Light Driven Photoelectrocatalytic Oxidation of As(III) at Low Positive Biasing Using Pt/TiO2 Nanotube Electrode a Ti2p peak, b O1s peak, and c Pt4f peak from XPS spectra of Pt/TiO2 nanotubes. The Pt deposition current density was 0.5 mA cm−2 and deposition time was 5 minBack to article page