缺陷介导的费米级调制增强了空间排序的S模式异质连接的光活性
Haifeng Lin1, Xinxin Xin1, Lei Xu1
1Key Laboratory of Eco-chemical Engineering, International S&T Cooperation Foundation of Eco-chemical Engineering and Green Manufacture, College of Chemistry and Molecular Engineering, Qingdao University of Science and Technology, Qingdao 266042, PR China.
具有受控缺陷的工程MoSe2/CdS异质连接显示出用于生产的增强光催化活性. 这种缺陷工程策略提高了太阳能转换效率.
科学领域:
- 材料科学 材料科学 材料科学
- 光催化作用的光催化
- 纳米技术 纳米技术
背景情况:
- S-方案光催化剂提供了增强的光收集和氧化还原能力.
- 可控缺陷工程仍然是提高S方案光催化剂性能的一个挑战.
研究的目的:
- 构建一个多臂的MoSe2/CdS S-scheme异质连接点,可调节的Se空位 (VSe) 和Mo5+度.
- 调查S-scheme电荷转移机制以及缺陷工程对光催化活性的影响.
主要方法:
- 在石CdS臂上制造少数或单层MoSe2.
- 密度函数理论 (DFT) 的计算.
- 在现场照相辐射的X射线光电子光谱 (XPS).
- 表面光伏 (SPV) 和根本测量.
主要成果:
- 在MoSe2/CdS异质连接中验证了S方案的费用转移机制.
- 通过通过合成温度调节VSe和Mo5+度,证明了费米水平差距的扩大.
- 在400纳米时实现了52.62 mmol·g−1·h−1的杰出H2进化活性,具有34.8%的明显量子效率.
- 与带Pt的CdS相比,观察到活动增加了25.8倍.
结论:
- 可控制的缺陷工程,特别是VSe和Mo5+度,显著提高了MoSe2/CdS复合材料的内置电场和载体转移.
- 开发的MoSe2/CdS S-scheme异质连接显示了高效太阳能转换和生产的巨大潜力.
- 这项研究为设计用于光催化的先进半导体纳米结构提供了一条途径.
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