An integrating photoanode consisting of BiVO4, rGO and LDH for photoelectrochemical water splitting
The low carrier mobility of BiVO4 is bottleneck limited its charge transfer in bulk or on surface. Herein, reduced graphene oxide (rGO) nanosheets as an effective electron mediators were successfully loaded on BiVO4 and NiFe-Layered double hydroxides (NiFe-LDH) were decorated on BiVO4/rGO heterojunctions by two facile electrodeposition methods to construct a triadic photoanode of BiVO4/rGO/NiFe-LDH for improvement of photoelectrochemical (PEC) water splitting efficiency of BiVO4. The photoanode significantly extends the absorption region of visible light, increases the photocurrent density, the onset potential exhibits a significant cathodic shifts, and enhances photon-to-electron conversion efficiency (IPCE) compared with the pristine BiVO4 photoanode. The enhancement of PEC properties benefits from the formation of p-n heterojunction between rGO and BiVO4 and the NiFe-LDH as cocatalyst accelerating of water evolution oxygen kinetics.