In situ growth of 1T-WS2 on ultrathin Ti3C2Tx as a hybrid cocatalyst for enhancing the photocatalytic activity of CdS
APPLIED SURFACE SCIENCE(2023)
摘要
Accelerating charge transfer and separation is the core mission of promoting photocatalytic H2 production activity. Here, the hybrid cocatalyst Ti3C2Tx/1T-WS2 is synthesized by in situ growth of 1T-WS2 on the ultrathin Ti3C2Tx surface using a solvothermal method for enhancing the photocatalytic activity of CdS. The difference in CB potentials between CdS and 1T-WS2 results in the rapid migration of photogenerated electrons from CdS to 1T-WS2. More importantly, because of the intimate Schottky interfacial contact between Ti3C2Tx and 1T-WS2, the electrons on the 1T-WS2 further rapidly transfer to the surface of Ti3C2Tx, thereby enhancing the separation efficiency of photogenerated electrons. Compared with the single Ti3C2Tx (4.66 mmol center dot g- 1 center dot h-1) and 1T-WS2 (10.65 mmol center dot g- 1 center dot h-1), the hybrid Ti3C2Tx/1T-WS2 cocatalyst (12.39 mmol center dot h- 1 center dot g- 1) has more excellent catalytic hydrogen evolution performance. The apparent quantum efficiency (AQE) Ti3C2Tx/1T-WS2/CdS at lambda = 420 nm reaches 50.9%. This work is helpful to understand the mechanism of the hybrid cocatalyst to improve charge separation.
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关键词
Charge transfer,Photocatalytic H 2 production,Schottky junction,Ti 3 C 2 T x,1T-WS 2 cocatalyst
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