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The CuSCN layer between BiVO 4 and NiFeO x for facilitating photogenerated carrier transfer and water oxidation kinetics.
Journal of Colloid and Interface Science 2024 April 5
Modification of oxygen evolution co-catalyst (OEC) on the surface of bismuth vanadate (BiVO4 ) can effectively improve the kinetics of water oxidation, but it is still limited by the small hole extraction driving force at the BiVO4 /OEC interface. Modulating the BiVO4 /OEC interface with a hole transfer layer (HTL) is expected to facilitate hole transport from BiVO4 to the OEC surface. Herein, a copper(I) thiocyanate (CuSCN) HTL is inserted between BiVO4 and NiFeOx OEC to create BiVO4 /CuSCN/NiFeOx photoanode, resulting in a significant enhancement of photoelectrochemical (PEC) water splitting performance. From electrochemical analyses and density functional theory (DFT) simulations, the markedly enhanced PEC performance is attributed to the insertion of CuSCN as an HTL, which promotes the extraction of holes from BiVO4 surface and boosts the water oxidation kinetics. The optimal photoanode achieves a photocurrent density of 5.6 mA cm-2 at 1.23 V versus the reversible hydrogen electrode (vs. RHE) and an impressive charge separation efficiency of 96.2 %. This work offers valuable insights into the development of advanced photoanodes for solar energy conversion and emphasizes the importance of selecting an appropriate HTL to mitigate recombination at the BiVO4 /OEC interface.
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