Ultrafast Deposition of NiFe Metal‐organic Framework Catalysts Boosts BiVO4 Photoanode for Efficient Solar Water Splitting

Abstract The severe photocorrosion of BiVO 4 limits its application in solar energy conversion in the long‐term photoelectrochemical stability test. Herein, we synthesized a Fe@Ni‐MOFs/BiVO 4 photoanode by a simple ultrasonic method and ultrafast deposition, which avoids the problems of damaging the surface structure of photoelectrode. The Fe@Ni‐MOFs/BiVO 4 shows a photocurrent density of 4.89 mA cm −2 at 1.23 V RHE with an onset potential of 0.25 V RHE under one sun illumination. Importantly, a stability over 30 h at 0.7 V RHE can be obtained, which is so far the best stability character for MOFs‐based cocatalysts decorated on BiVO 4 . During operation, Fe@Ni‐MOFs transforms into a homogeneous and active hydroxide layer covering the surface, which exposes more active sites for OER reactions. This work demonstrates a simple strategy for MOFs co‐catalysts to obtain fast hole transfer capability and reduce carrier recombination, thereby improving PEC performance.