Increasing Solar Absorption for Photocatalysis with Black Hydrogenated Titanium Dioxide Nanocrystals
Increasing Solar Absorption for Photocatalysis with Black Hydrogenated Titanium Dioxide Nanocrystals
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DOI：
10.1126/science.1200448
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发表时间：
2011-02-11
期刊：
影响因子：
56.9
通讯作者：
Mao, Samuel S.
中科院分区：
文献类型：
--
作者：
Chen, Xiaobo;Liu, Lei;Mao, Samuel S.
当用作光催化剂时，二氧化钛只吸收紫外光，已经采取了几种方法，包括使用氮气等掺杂剂来缩小二氧化钛的带隙。我们展示了一种通过氢化在纳米相二氧化钛表面引入无序来增强太阳吸收的概念上不同的方法。我们展示了无序工程二氧化钛纳米晶在太阳能驱动下的光催化活性，包括有机分子在水中的光氧化和使用牺牲剂产生氢气。
When used as a photocatalyst, titanium dioxide (TiO2) absorbs only ultraviolet light, and several approaches, including the use of dopants such as nitrogen, have been taken to narrow the band gap of TiO2. We demonstrated a conceptually different approach to enhancing solar absorption by introducing disorder in the surface layers of nanophase TiO2 through hydrogenation. We showed that disorder-engineered TiO2 nanocrystals exhibit substantial solar-driven photocatalytic activities, including the photo-oxidation of organic molecules in water and the production of hydrogen with the use of a sacrificial reagent.