材料科学
异质结
分解水
贵金属
高分辨率透射电子显微镜
光致发光
光催化
X射线光电子能谱
可见光谱
制氢
吸收(声学)
肖特基势垒
分析化学(期刊)
光电子学
氢
纳米技术
化学工程
透射电子显微镜
金属
催化作用
化学
工程类
复合材料
色谱法
二极管
有机化学
冶金
生物化学
作者
Uttam Kumar,Saswata Chakraborty,Ranjan K. Sahu,Pallab Bhattacharya,Trilochan Mishra
标识
DOI:10.1002/admi.202101680
摘要
Abstract High charge separation efficiency with a wide optical absorption window is the prime requirement for the scale up of a stable solar photocatalytic hydrogen generation process. A new noble metal‐free heterostructure of 2D MoS 2 ‐CdS‐Cu 2 O is designed by depositing cauliflower‐shaped CdS and nanosized Cu 2 O on exfoliated 2D MoS 2 . Characterization by XPS, high‐resolution transmission electron microscopy (HRTEM), and UV‐visible spectra confirms the formation of nanosized Cu 2 O with desired interface formation with MoS 2 sheet and CdS thus extending the optical absorption range up to 900 nm. Water splitting activity in the presence of lactic acid is found to be 7.89 and 11.53 mmol g −1 h −1 on MoS 2 ‐CdS and MoS 2 ‐CdS‐Cu 2 O, respectively, with good repeatability under visible light. Efficient interfacial charge separation is manifested from demised photoluminescence (PL) intensity which supports the suppression of hole‐electron recombination in the tertiary heterostructure. In addition, the formation of dual p‐n junction as indicated from Mott–Schottky analysis further strengthen the faster electron and holes separation objective. Compared to the pure CdS, hydrogen efficiency is 20.96 times higher on a noble metal‐free tertiary catalyst with an apparent quantum efficiency of 8.75%. Hopefully, the 2D material‐based architecture of dual p‐n junction with desired interface engineering will facilitate the catalyst design with increased water splitting activity under solar/visible light.
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