WO3-x sensitized TiO2 spheres with full-spectrum-driven photocatalytic activities from UV to near infrared.
WO3-x sensitized TiO2 spheres with full-spectrum-driven photocatalytic activities from UV to near infrared.
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DOI：
10.1039/c6nr06767k
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发表时间：
2016-10
期刊：
影响因子：
6.7
通讯作者：
Mei Yan;G. Li;Chongshen Guo;Wei Guo;Dandan Ding;Shouhao Zhang;Shaoqin Liu
中科院分区：
文献类型：
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作者：
Mei Yan;G. Li;Chongshen Guo;Wei Guo;Dandan Ding;Shouhao Zhang;Shaoqin Liu
为了充分利用太阳能进行光催化反应，本研究开发了在紫外、可见光甚至近红外照射下具有明显光催化活性的全光谱响应光催化剂，用于亚甲基蓝的光降解。TiO2@WO3-x的核壳结构是结合WO3-x的全光谱光吸收特性和TiO2优异的半导体特性进行设计的。正如预期的那样，WO3-x敏化TiO2球在300- 2500nm的整个区域产生了显著的强光吸收，从而显示出充分利用所有太阳能的理想光催化性能，特别是在未开发的近红外部分，占大部分的阳光。受上述令人兴奋的光催化结果的鼓舞，我们进一步提出了一种合理的机制来解释nir驱动的光催化性能，该机制基于低价W5+位点诱导自由电子的假设和基于证据的ESR结果。
To make full use of solar energy for photocatalytic reactions, in this work, we developed full-spectrum-responsive photocatalysts with noteworthy photocatalytic activities under either UV, visible or even near infrared irradiation for the photodegradation of methylene blue. The core-shell structure of TiO2@WO3-x is designed from the consideration of combining the full-spectrum photo-absorption properties of WO3-x with the excellent semiconductor properties of TiO2. As expected, the WO3-x sensitized TiO2 sphere gives rise to a prominently strong optical absorption in the whole region of 300-2500 nm and thus displays desired photocatalytic properties for the full utilization of all solar energy, especially in the unexploited NIR part, which accounts for most of the sunlight. Encouraged by the above exciting photocatalytic outcome, we then go further to propose a plausible mechanism for interpreting the NIR-driven photocatalytic properties, which is based on the hypothesis of low-valent W5+ site induced free electrons and evidence-based ESR results.