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首页> 外文期刊>Journal of Materials Chemistry, A. Materials for energy and sustainability >Enhanced visible light photocatalytic activity of TiO2 assisted by organic semiconductors: a structure optimization strategy of conjugated polymers
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Enhanced visible light photocatalytic activity of TiO2 assisted by organic semiconductors: a structure optimization strategy of conjugated polymers

机译：由有机半导体辅助TiO2的增强的可见光光催化活性：共轭聚合物的结构优化策略

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The search for high-efficient TiO2-based heterojunction photocatalyst for photocatalytic H-2 evolution and pollutant removal remains a great challenge. In this study, linear conjugated polymer B-BT-1,4-E consisting of alternating electron donor and electron acceptor was incorporated on the surface of TiO2 to form a binary composite in the facile in situ strategy. B-BT-1,4-E/TiO2 exhibited superior photocatalytic activity under visible light irradiation (lambda = 420 nm). The hydrogen evolution rate (HER) of 16.7% B-BT-1,4- E/TiO2 reached 220.4 mu mol h(-1) without additional noble metal (Pt), and the optimized 13.3% B-BT-1,4- E/TiO2 also displayed outstanding CIP degradation efficiency with a kinetic constant of 0.232. Based on extensive characterization results from UV-Vis diffused reflectance spectra (DRS), electron spin resonance (ESR), photocurrent, electrochemical impedance spectroscopy (EIS) and photoluminescence (PL), the enhanced photocatalytic activity of B-BT-1,4-E/TiO2 heterojunction can be attributed to broader visible light absorption range, faster charge separation and transfer. Moreover, a reasonable photocatalytic mechanism is also proposed. In comparison to reported CMP(BBT)/TiO2, HER and kinetic constants of CIP degradation with B-BT-1,4-E/TiO2 as the photocatalyst were increased by 7.3 times and 3.1 times, respectively. This study demonstrated that intrinsic merits of conjugated polymers made them promising candidates for exploring more efficient organic semiconductor-inorganic semiconductor heterojunction photocatalysts.
机译：寻找用于光催化H-2演化和污染物去除的高效基于TiO2的异质结光催化剂仍然是一个很大的挑战。在该研究中，将由交替的电子给体和电子受体组成的线性缀合的聚合物B-BT-1,4-e掺入TiO 2的表面上，以在展开策略中形成二元复合材料。 B-BT-1,4-E / TiO2在可见光照射下表现出优异的光催化活性（Lambda＆ = 420nm）。 16.7％B-BT-1,4- E / TiO 2的氢进化速率（她）达到220.4μmolH（-1），而无需额外的贵金属（Pt），优化的13.3％B-BT-1,4 - E / TiO2还显示出优异的CIP劣化效率，动力量为0.232。基于UV-VI扩散反射光谱（DRS），电子自旋共振（ESR），光电流，电化学阻抗谱（EIS）和光致发光（PL）的广泛表征结果，增强B-BT-1,4-的增强的光催化活性E / TiO2异质结可归因于更宽的可见光吸收范围，更快的电荷分离和转移。此外，还提出了合理的光催化机理。与报道的CMP（BBT）/ TiO 2相比，作为光催化剂的B-BT-1,4-E / TiO 2的CIP降解的HER和动力学常数分别增加了7.3倍和3.1倍。该研究表明，共轭聚合物的内在优点使其成为探索更高效的有机半导体无机半导体异质结光催化剂的承诺候选者。

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