Publication date: 28th August 2024
BiOBr is used as a promising material in various photoelectrocatalytic reactions, but its application in hydrogen evolution reaction (HER) is not commonly reported, because the instability under photoelectrochemical environment has become a drawback for BiOBr as a photoelectrocatalyst for reduction reactions.1 To solve this problem, MoS2 is induced to form a van der Waals heterojunction to stabilize the crystal structure of BiOBr in HER.2 By DFT calculation, we state that the active sites in the heterojunction are on sulfur centers, which also combines BiOBr by van der Waals force. Moreover, different MoS2/BiOBr ratios can result in different structure tolerance of BiOBr: heterojunction with 1% MoS2 can increase the stability of BiOBr while 50% MoS2 even accelerate the reduction of BiOBr. By performing the in situ wide-angle X-ray diffraction (WAXD) on MoS2/BiOBr with 1% and 50% of MoS2, respectively, we monitored the phase transfer speed of BiOBr during the HER. Interestingly, when UV light is induced, there is less amount of BiOBr reduced under negative potential due by the photogenerated holes that could react with extra electrons from negative bias or photo energy and prevent BiOBr to be further reduced.3
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