The EIS analysis and Nyquist plots in Figure illustrate the impact of QDs on charge transfer resistance during OER. MoS 2 @NiFeCo-LDH has the lowest resistance (8.5 Ω cm -2 ) in the lowfrequency regime. The resistance further decreases below 4 Ω cm -2 upon light irradiation. These observations suggest that MoS 2 @NiFeCo-LDH has very low charge transfer resistance and fast OER kinetics. Furthermore, the photogenerated charge carriers (electrons and holes) may further enhance conductivity and electrochemical kinetics under light illumination.