A WO3/Ag–Bi oxygen-evolution catalyst for splitting water under mild conditions

Abstract A WO 3 /Ag–B i based oxygen-evolution catalyst, combining an Ag–B i catalyst with WO 3 , has been prepared. This catalyst shows excellent catalytic activity for the splitting of water under mild conditions (near neutral, room temperature, and atmospheric pressure). The WO 3 /Ag–B i catalyst shows a high oxygen-evolution rate (30.85 μmol/h), a high Faradaic efficiency (91.30%), and a low oxygen-evolution overpotential (290 mV). Oxygen evolution and stability performance have been investigated by electrochemical measurements. The WO 3 /Ag–B i catalyst has been further characterized by powder X-ray diffraction (XRD), scanning electron microscopy (SEM), energy-dispersive spectrometry (EDS), and X-ray photoelectron spectroscopy (XPS).