在1T'-ReS2共催化剂中触发道-硫位点,以实现丽的光催化生成
Jiachao Xu1, Wei Zhong1, Xidong Zhang2
1State Key Laboratory of Silicate Materials for Architectures and School of Chemistry, Chemical Engineering and Life Sciences, Wuhan University of Technology, Wuhan, 430070, P. R. China.
在催化剂中优化电子密度是有效生产的关键. 这项研究削弱了ReMoS2中的Re-Re键,以增强吸附,在TiO2.2上实现了2.6倍高的H2演化率.
科学领域:
- 材料科学 材料科学 材料科学
- 催化剂是一种催化剂.
- 摄影化学的使用.
背景情况:
- 有效的 (H2) 进化需要优化吸附/脱附的可催化剂活性位点.
- 电子密度操纵对于调整光催化剂在光催化剂中的性能至关重要.
- 1T' ReS2是一个有前途的共催化剂,但它的进化活动需要加强.
研究的目的:
- 开发一种策略,以优化1T' Re1-xMo_xS2共催化剂中活性位点的电子密度.
- 为了提高的吸附强度,提高的生产率.
- 为高效的H2进化合成和描述Re1-xMo_xS2/TiO2光催化剂.
主要方法:
- 在现场固定超薄的Re1-xMo_xS2纳米片在TiO2上,使用融盐方法.
- 合成具有不同Mo含量的Re1-xMo_xS2/TiO2光催化剂.
- 使用密度函数理论 (DFT) 和in situ/ex situX射线光电子谱学 (XPS) 的表征.
主要成果:
- 最佳的Re0.92Mo0.08S2/TiO2光催化剂表现出10.56 mmol g-1 h-1的演变速率,比ReS2/TiO2.2高2.6倍.
- 在优化样本中,明显的量子效率达到了大约50.6%.
- DFT和XPS证实,Mo的引入削弱了Re-Re键,产生了缺电子的硫位点,对于热中性S-H键具有最佳电子密度.
结论:
- 通过Mo兴奋剂削弱金属-金属键强度是一种有效的策略,以调整活性位点的电子密度.
- 在ReMoS2/TiO2中优化的缺电子硫位点促进了优异的吸附和H2进化.
- 这项工作提供了设计高性能光催化剂的基本见解,通过操纵内在的结合结构来设计高性能光催化剂.
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