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首页> 外文期刊>Catalysis science & technology >The pH-depending enhancement of electron transfer by {001} facet-dominating TiO2 nanoparticles for photocatalytic H2 evolution under visible irradiation
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The pH-depending enhancement of electron transfer by {001} facet-dominating TiO2 nanoparticles for photocatalytic H2 evolution under visible irradiation

机译：通过{001}刻度为主导的TiO2纳米颗粒对电子传输的pH pH向深度增强，用于光催化H2在可见辐射下进化

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摘要

TiO2 nanoparticles with an exposed reactive {001} facet have exhibited more favourable properties in photocatalysts, batteries and photoelectrochemical cells owing to their superiority of association properties with adsorbents, electron transfer, ion insertion capacity, etc. to the conventional TiO2. We recently revealed the effects of {001} facet-dominating TiO2 on the electron injection from photo-excited dye-sensitizers exhibiting an order of magnitude increase in the rate constant. We herein report that {001} facet-dominating TiO2 enhances the efficiency of photocatalytic H2 evolution with the porphyrine dye-sensitized TiO2 nanoparticles in an aqueous suspension especially with the specific pH region above 8 (in alkaline solution) under visible irradiation as compared with conventional P25. The analysis of fluorescence quenching in a TiO2 colloidal suspension based on the Stern-Volmer relationship is employed to estimate the electron injection efficiency of photo-excited electrons in dye-sensitizers. The results imply that the enhancement of H2 evolution by {001} facet-dominating TiO2 is attributed to its efficient photo-excited electron injection process from dye-sensitizers to TiO2 as compared with conventional P25.
机译：具有暴露反应性{001}方面的TiO2纳米颗粒在光催化剂，电池和光电化化学细胞中表现出更有利的性能，这是由于它们具有与吸附剂，电子传递，离子插入能力等的相关性能优势，其对常规TIO2。最近，我们揭示了{001}占主导地位的TiO2对光兴奋的染料敏感器的电子注入的影响，该染料敏感剂表现出速率常数的数量级增加。我们在这里报告说，{001}占主导地位的TIO2提高了光催化H2进化的效率，卟啉染料敏感的TiO2纳米颗粒在水性悬浮液中，尤其是在8（碱性溶液中）与传统的pH区（在碱性溶液中）相比，在水性悬浮液中的效率（在碱性溶液中） P25。基于船尾伏默关系的TIO2胶体悬浮液中荧光淬灭的分析用于估计染料敏感器中光激发电子的电子注入效率。结果表明，与常规p25相比，{001} faceT为主的TIO2通过{001}构成式占主导TIO2的进化归因于其有效的光启用电子注入过程，从染料敏感器到TIO2。

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