Fig. 2From: Efficiently Visible-Light Driven Photoelectrocatalytic Oxidation of As(III) at Low Positive Biasing Using Pt/TiO2 Nanotube ElectrodeSEM images of Pt/TiO2 nanotubes prepared at different current density: a 0.2 mA cm−2, b top view and c cross-sectional view with 0.5 mA cm−2 of current density, d 0.8 mA cm−2 current densityBack to article page