Fe 2 TiO 5 as an Efficient Co-catalyst To Improve the Photoelectrochemical Water Splitting Performance of BiVO 4

Fe 2 TiO 5 was synthesized via the solvothermal method and adopted as co-catalyst to improve the photoelectrochemical (PEC) water splitting performance of BiVO 4 photoanode. After surface modification by Fe 2 TiO 5, the BiVO 4 /Fe 2 TiO 5 photoanode shows a 300 mV cathodic shift in onset potential and 3 times enhancement in photocurrent, which delivers a photocurrent density of 3.2 mA/cm 2 at 1.23 V vs reverse hydrogen electrode. Systematic optical, electrochemical, and intensity-modulated photocurrent spectroscopy characterizations were performed to explore the role of Fe 2 TiO 5 and reveal that the enhanced PEC performance is mainly caused by the surface passivation effect of Fe 2 TiO 5 .