Photothermal Catalysis over Nonplasmonic Pt/TiO2 Studied by Operando HERFD-XANES, Resonant XES, and DRIFTS,ACS Catalysis

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Photothermal Catalysis over Nonplasmonic Pt/TiO2 Studied by Operando HERFD-XANES, Resonant XES, and DRIFTS
ACS Catalysis ( IF 11.3 ) Pub Date : 2018-10-22 00:00:00 , DOI: 10.1021/acscatal.8b03724
Ying Zhou _{1,

2} , Dmitry E. Doronkin _{1,

3} , Ziyan Zhao _{1,

2} , Philipp N. Plessow ₃ , Jelena Jelic ₃ , Blanka Detlefs ₄ , Tim Pruessmann _{1,

3} , Felix Studt _{1,

3} , Jan-Dierk Grunwaldt _{1,

3}

Affiliation

There is strong interest in developing photothermal catalysts that can utilize both thermal energy and low-intensity photon flux. The complementary use of operando diffuse reflectance infrared Fourier transform spectroscopy (DRIFTS), high-energy-resolution fluorescence detected X-ray absorption near-edge structure (HERFD-XANES), and X-ray emission spectroscopy (XES) provided mechanistic insight into the photothermal catalytic oxidation of CO over Pt/TiO₂. The methods turned out to be sensitive enough to uncover a change in the electronic structure of the Pt sites upon light illumination. The Pt sites on TiO₂ were found to be more oxidized upon light illumination. The CO coverage is reduced, which results in a ∼20-fold rate enhancement of CO oxidation at 45 °C. Finally, a promising operando spectroscopic route to understand photothermal catalytic reactions is proposed.

中文翻译：

Operando HERFD-XANES，共振XES和DRIFTS研究非等离子Pt / TiO _2上的光热催化

开发可同时利用热能和低强度光子通量的光热催化剂引起了人们极大的兴趣。操作扩散散射红外傅里叶变换光谱（DRIFTS），高能分辨率荧光检测的X射线吸收近边缘结构（HERFD-XANES）和X射线发射光谱（XES）的互补使用提供了对Pt / TiO ₂上CO的光热催化氧化。结果证明该方法足够灵敏，以在光照下揭示Pt位的电子结构的变化。TiO ₂上的Pt位被发现在光照下被氧化得更多。一氧化碳的覆盖率降低了，这导致在45°C时一氧化碳的氧化速率提高了约20倍。最后，提出了一种有前途的操作光谱方法来理解光热催化反应。

更新日期：2018-10-22

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