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Theoretical Modeling Of Photocatalytic Active Species on Illuminated Tio_2

机译:Tio_2上光催化活性物种的理论建模

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A theoretical study of the H_2O and O_2 adsorption on an illuminated TiO_2 anatase surface is presented. The electronic structure and the spin distribution were examined by employing the DFT formalism and the BHandHLYP functional. The adsorbates geometries were fully optimized, including the cluster relaxation. Our results show the dissociative adsorption of the H_2O molecule on the photoactivated TiO_2 (001) surface. This reaction produces one hydroxyl group with radical character (OH~·) and an unpaired electron localized in the 5c-Ti atom. In case of the O_2 molecule, the non-dissociative chemisorption was obtained. This molecule shows one unpaired electron and a negative charge. In these sense, the adsorbed O_2 acts as a superoxide species (O_2~(·-)).
机译:提出了在光照的TiO_2锐钛矿表面吸附H_2O和O_2的理论研究。通过采用DFT形式和BHandHLYP功能检查电子结构和自旋分布。吸附物的几何形状被完全优化,包括团簇松弛。我们的结果表明H_2O分子在光活化TiO_2(001)表面上的解离吸附。该反应产生一个具有自由基特征(OH〜·)和位于5c-Ti原子中的不成对电子的羟基。在O_2分子的情况下,获得了非离解性化学吸附。该分子显示一个不成对的电子和一个负电荷。从这些意义上讲,吸附的O_2起着超氧化物(O_2〜(·-))的作用。

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