LAUSR

Abstract Constructing the high-performance photoanode is critical to improve photoelectrochemical (PEC) efficiency, but it is still an inevitable challenge to rationally fabricate the organic-inorganic hybrid-photoanode system. For the first time, we report a novel hybrid-photoanode built from ultrathin NiFe-MOF and TiO2 by a sacrifice template method. The in-situ etch of NiFe-layered double hydroxide (LDH) on the surface of TiO2 has been successfully realized in the coordination environment, for creating coordinately unsaturated metal sites on NiFe-MOF. The coordinately unsaturated metal sites could significantly promote the water oxidation kinetic, compared with conventional electrode/electrolyte interface. The photocurrent density of the NiFe-MOF/TiO2 has reached about 3.35 times of bare TiO2 at 1.23 V (vs. RHE), and the incident photon to current conversion efficiency (IPCE) value has been improved up to 42% (at 390 nm). The significant augment of the charge injection ( η injection ) of 92.8% and charge separation ( η separation ) efficiency of 37.4% has also been exhibited. Moreover, NiFe-MOF/TiO2 shows a long-term stability (