光催化
杂原子
兴奋剂
材料科学
硫化镉
带隙
半导体
光化学
密度泛函理论
量子产额
辐照
光电流
纳米技术
化学工程
光电子学
化学
催化作用
计算化学
有机化学
生物化学
戒指(化学)
物理
量子力学
核物理学
冶金
荧光
工程类
作者
Wei Li,Fei Wang,Xiaoyun Liu,Yanyan Dang,Jiayuan Li,Tenghao Ma,Chuanyi Wang
标识
DOI:10.1016/j.apcatb.2022.121470
摘要
Cadmium sulfide (CdS) has been extensively employed to achieve highly efficient H2 production under visible-light irradiation due to its features of narrow bandgap and appropriate conduction band position. However, fast carriers recombination and severe photocorrosion inevitably result in low carriers utilization, leading to undesirable photocatalytic performance and poor durability. To address the issues, N heteroatoms were introduced into the lattice of hexagonal CdS NPs to prepare the N-doped CdS (N-CdS) nanocatalyst via a wet chemical precipitation coupled with a hydrothermal process. Due to the synergetic promotion of heteroatom-semiconductor coordination (HSC) interaction to body carriers migration of CdS, their recombination behavior was effectively hampered, resulting obviously increased photocurrent density (~2 times) and significantly improved photoexcited carriers utilization. Thereby, high apparent quantum yield (AQY = 32.41%, λ = 500 nm) was achieved by the optimized N0.2-CdS nanocatalyst. Under simulated sunlight (SSL) irradiation, about 3983.4 μmol·h−1·g−1 of HER rate with excellent photostability was achieved at absence of cocatalyst, which raises to about 9-fold greater than that of bare CdS NPs. Moreover, density functional theory (DFT) calculations proved that the energy barrier of water splitting on Cd sites and |ΔGH*| of H2 generation on S sites were reduced obviously due to the synergetic HSC interaction, which thermodynamically accelerated the H2 generation. This study provides a simple and green strategy for gaining highly stable CdS photocatalyst with improved HER photoactivity.
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