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首页> 外文期刊>Applied Surface Science >Chromium-doped Titanium Dioxide Thin-film Photoanodes In Visible-light-induced Water Cleavage
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Chromium-doped Titanium Dioxide Thin-film Photoanodes In Visible-light-induced Water Cleavage

机译：可见光诱导水裂解中的铬掺杂二氧化钛薄膜光阳极

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摘要

A new method for the synthesis of nanocrystalline anatase Cr-doped TiO_2 colloids from nanotubes utilizing the hydrothermal ion-intercalation (HII) method has been devised using hydrothermal treatment in an acidic environment. To investigate the photoelectrochemical reaction that occurs when water is split into H_2 and O_2 under visible light, a Cr-doped TiO_2 thin film served as a model photoelectrode. The photoelectrochemical activity of Cr-doped TiO_2 was higher than that of the undoped sample. The photoelectrochemical activity of photoelectrodes increased drastically with increased chromium doping. A red shift in the band gap was induced by Cr doping of TiO_2. It was revealed that the Cr-doped TiO_2 photoelectrode was able to utilize a wide range of light in the visible region of the spectrum. At high Cr concentrations, the lower photoelectrochemical activity is attributed to the effect of Cr~(3+) ion recombination and excess Cr~(3+) ions forming secondary phase Gr_2O_3.
机译：提出了利用水热离子嵌入（HII）法从纳米管合成纳米晶锐钛矿型Cr掺杂TiO_2胶体的新方法。为了研究在可见光下水分解为H_2和O_2时发生的光电化学反应，将Cr掺杂的TiO_2薄膜用作模型光电极。 Cr掺杂的TiO_2的光电化学活性高于未掺杂的样品。随着铬掺杂的增加，光电极的光电化学活性急剧增加。 Cr_2掺杂TiO_2引起了带隙的红移。揭示了Cr掺杂的TiO_2光电极能够在光谱的可见光区域中利用宽范围的光。在较高的Cr浓度下，较低的光电化学活性归因于Cr〜（3+）离子重组和形成第二相Gr_2O_3的过量Cr〜（3+）离子。

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