Significant improvement in photocatalytic activity by forming homojunction between anatase TiO2 nanosheets and anatase TiO2 nanoparticles
Significant improvement in photocatalytic activity by forming homojunction between anatase TiO2 nanosheets and anatase TiO2 nanoparticles
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通过在锐钛矿型 TiO2 纳米片和锐钛矿型 TiO2 纳米颗粒之间形成同质结，显着提高光催化活性
DOI：
10.1016/j.apsusc.2019.05.351
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发表时间：
2019-10
影响因子：
6.7
通讯作者：
Zhao Xiujian
中科院分区：
文献类型：
--
作者：
Ren Lu;Li Yuanzhi;Mao Mingyang;Lan Lan;Lao Xinbin;Zhao Xiujian
采用蒸汽诱导水热法制备了以{001}面（TS）为主的锐钛矿型TiO2纳米片（TS）负载的以{101}面（TP）为主的锐钛矿型TiO2纳米颗粒的新型同质结TiO2样品，采用不同的TP/TS比（表示为R%TP/TS），然后进行光热催化处理。通过 TEM、XRD、拉曼、XPS、BET、PL 光谱、紫外可见吸收光谱、光电流测量和荧光发射衰减对 TiO2 样品进行了表征。研究发现TP/TS同质结的形成显着增强了丙酮光降解的光催化活性。 2.5%TP/TS、5%TP/TS和10%TP/TS的TiO2样品表现出比TS和TP更高的光催化活性。特别是，优化后的5%TP/TS的丙酮降解CO2比生产率分别是TS、TP和P25的4.0、5.4和3.3倍。光电流、PL和荧光发射衰减的结果表明，光催化活性的显着增强归因于通过形成同质结有效提高了光生电子空穴分离效率。这项研究提供了一种通过构建同质结来显着提高光生电子空穴分离效率和光催化活性的新方法。
Novel homojunction TiO2samples of anatase TiO2nanoparticles with dominant {101} facets (TP) supported on anatase TiO2nanosheets with dominant {001} facets (TS) in different ratio of TP/TS (denoted as R%TP/TS) were prepared by a vapor-induced hydrothermal method and followed by photothermocatalytic treatment. The TiO2samples were characterized with TEM, XRD, Raman, XPS, BET, PL spectra, UV–vis absorption spectra, photocurrent measurement, and fluorescence emission decay. It is found that the formation of the TP/TS homojunction significantly enhances the photocatalytic activity for acetone photodegradation. The TiO2samples of 2.5%TP/TS, 5%TP/TS, and 10%TP/TS exhibit much higher photocatalytic activity than TS and TP. Especially, the specific CO2production rate for acetone degradation of the optimized 5%TP/TS is 4.0, 5.4 and 3.3 times higher than that of TS, TP, and P25, respectively. The results of photocurrent, PL, and fluorescence emission decay demonstrate that the significant enhancement in photocatalytic activity is attributed to the efficient improvement in photogenerated electron-hole separation efficiency by forming homojunction. This study provides a new approach by building homojunction to significantly enhancing the separation efficiency of the photogenerated electron-hole and photocatalytic activity.
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