Abstract
Bismuth vanadate (BiVO4) as oxygen evolution photoanodes in photoelectrochemical (PEC) water splitting is hampered by the severe charge recombination and sluggish kinetic reaction. Herein, we successively construct a novel homogenous BVO/BiVO4 photoanodes consisting of BiVO4 nanodots (BVO) with exposed (011) crystal facet on BiVO4 substrate that did not only creates tunable (011)/(110) crystal planes upon homogeneous interfacial contact but also demonstrates an unprecedented photocurrent density with outstanding performance. Theoretical calculations clearly reveal that the tunable (011)/(110) crystal facet facilitates the charge separation efficiency and water splitting kinetics. Furthermore, the photocurrent density of the homogenous BVO/BiVO4 is further enhanced by additional photo-deposition of NiFeOx electrocatalyst layer (denoted NiFeOx/BVO/BiVO4). Consequently, the optimized NiFeOx/BVO/BiVO4 photoanodes not only reaches an unprecedented photocurrent density of 6.40 mA cm−2 at 1.23 V versus reversible hydrogen electrode (RHE) under simulated AM 1.5G illumination, but also generates an outstanding durability. This work endows a new environmentally friendly and effective path for improving PEC water splitting of BiVO4 photoanodes.
Published Version
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