Black single-crystal TiO2 nanosheet array films with oxygen vacancy on {001} facets for boosting photocatalytic CO2 reduction
Black single-crystal TiO2 nanosheet array films with oxygen vacancy on {001} facets for boosting photocatalytic CO2 reduction
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DOI：
10.1016/j.jallcom.2021.159400
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发表时间：
2021-07
影响因子：
6.2
通讯作者：
Wei Zhang;J. Xue;Qianqian Shen;Shufan Jia;Jiaqi Gao;Xuguang Liu;H. Jia
中科院分区：
文献类型：
--
作者：
Wei Zhang;J. Xue;Qianqian Shen;Shufan Jia;Jiaqi Gao;Xuguang Liu;H. Jia
采用温和的铝热还原固相反应法制备了{001}面氧空位的黑色TiO 2纳米片阵列薄膜。氧空位增加了可见光的吸收和光生电子-空穴对的分离效率。对于退火法制备的含氧空位的黑色TiO 2，只有{001}晶面上的氧空位促进了光催化CO2还原，而少量的{101}晶面上的氧空位促进了光生电子和空穴的复合，抑制了光催化CO2还原性能。同时，{001}晶面氧空位的黑色TiO 2纳米片阵列薄膜在可见光照射下具有良好的光催化还原CO2的能力，还原速率为128.5 μmol·g-1·h-1，这是由于氧空位的形成和特殊的不饱和配位Ti 5原子的协同作用，提高了对CO2的吸附能力，提高了CO2还原为CO的速率.
Black TiO2nanosheet array films with oxygen vacancy on {001} facets were prepared by solid phase reaction with a mild aluminothermic reduction method. The oxygen vacancies increase the absorption of visible light and the separation efficiency of photogenerated electron-hole pairs. For the black TiO2with oxygen vacancy prepared by annealing, only the oxygen vacancies on {001} facets boost the photocatalytic CO2reduction, while these on {101} facets in a small number increase the recombination of photogenerated electrons and holes and inhibit the photocatalytic CO2reduction performance. Meanwhile, the black TiO2nanosheet array films with oxygen vacancy on {001} facets have a good photocatalytic CO2reduction to CO with a reduction rate of 128.5 µmol•g–1•h–1under visible light irradiation, which is ascribed to the formation of oxygen vacancy and the synergistic effect of special unsaturated coordination Ti5catom improving the adsorption capacity of CO2and increasing the reduction rate of CO2to CO.