确定Pt活性物种在对CO敏感的光催化H2进化中的作用
Kaiyi Su1, Tengshijie Gao1, Haixia Liu1
1Technical Institute of Physics and Chemistry, Technical Institute of Physics and Chemistry, CAS, CHINA.
Angewandte Chemie (International ed. in English)
|June 14, 2025
概括
(Pt) 活性物种影响的生产. 在低一氧化碳 (CO) 水平下,Pt4+ 增强了 H2 演变,但在高的 CO 水平下被抑制,暴露了 CO.
科学领域:
- 光催化作用的光催化
- 气生产 气生产
- 表面化学 表面化学
背景情况:
- (Pt) 是光催化 (H2) 生产的关键催化剂.
- 一氧化碳 (CO) 对Pt催化质子减少的影响尚不清楚.
研究的目的:
- 研究不同活性物种在对CO敏感的光催化H2进化中的作用.
- 阐明CO对Pt催化剂产生H2产生影响的机制.
主要方法:
- 使用Pt/Nb2O5作为模型催化剂系统.
- 采用了CO-温度编程吸 (CO-TPD),现场FTIR光谱和密度函数理论 (DFT) 计算.
- 在不同的CO-to-Pt摩尔比率 (nCO/nPt) 下评估光催化H2生产率.
主要成果:
- 在低nCO/nPt (≤1.3) 时,Pt4+物种显示出高的H2生产活性,但在高nCO/nPt (>1000) 时,性能显著下降.
- 低价值的Pt物种表现出较低的活性,并且受到CO的影响较小.
- 发现吸附的CO阻碍了H2O与Pt4+的相互作用,并抑制了活性 (*H) 物种的形成.
结论:
- Pt活性物种的价值状态关键决定了它们对光催化H2生产中的CO抑制的反应.
- 抑制 Pt4+ 上的 CO 吸附对于在含有 CO 的环境中提高 H2 生产率至关重要.
- 这项研究提供了对CO受影响的光催化系统中活性物种生成和转化的见解.
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