Hydrothermal Synthesized CoS2 as Efficient Co-Catalyst to Improve the Interfacial Charge Transfer Efficiency in BiVO4

The bare surface of BiVO4 photoanode usually suffers from extremely low interfacial charge transfer efficiency which leads to a significantly suppressed photoelectrochemical water splitting performance. Various strategies, including modification and the loading co-catalysts, facilitate interface process in BiVO4. In this study, we demonstrate that CoS2 synthesized hydrothermal method can be used as high-efficient co-catalyst sufficiently improve performance was improved after modification. BiVO4/CoS2 achieved an excellent photocurrent density 5.2 mA/cm2 at 1.23 V versus RHE under AM 1.5 G illumination, corresponding 3.7 times enhancement compared with onset potential also negatively shifted by 210 mV. followed systematic combined optical electrochemical characterization results reveal largely less than 20% more 70% due tor further carrier dynamics study performed using intensity modulated spectroscopy displayed 6–10 suppression recombination rate constants for modified BiVO4, suggests key reason possibly originates passivated states coating CoS2.