Understanding the anatase-rutile phase junction in charge separation and transfer in a TiO(2) electrode for photoelectrochemical water splitting.
Understanding the anatase-rutile phase junction in charge separation and transfer in a TiO(2) electrode for photoelectrochemical water splitting.
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了解用于光电化学水分解的 TiO2 电极中电荷分离和转移中的锐钛矿-金红石相连接
DOI：
10.1039/c6sc01611a
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发表时间：
2016-09-01
期刊：
影响因子：
8.4
通讯作者：
Li C
中科院分区：
文献类型：
--
作者：
Li A;Wang Z;Yin H;Wang S;Yan P;Huang B;Wang X;Li R;Zong X;Han H;Li C
相位结有效分离电荷的关键是要考虑相位对准和界面结构。对基于结的有效电荷分离设计的新见解对当前太阳能转换研究至关重要。本文通过快速热退火处理在TiO 2薄膜中引入锐钛矿-金红石相结，并详细研究了该相结对电荷分离和转移的作用。瞬态吸收光谱，电化学和光电化学（PEC）测量的综合研究表明，适当的相位对准是必要的单向电荷转移，和结界面与最小化的陷阱状态是至关重要的释放的电荷分离电位的相位结。通过对相取向和界面结构的调控，适当引入相结，优化的TiO 2薄膜在电荷分离和转移方面表现出上级的性能，从而实现了约100 nm的电荷转移。3和9倍的光电流密度增强相比，原始的金红石和金红石相的TiO 2电极分别。这项工作证明了相位结在太阳能转换应用中有效的电荷分离和转移的巨大潜力。
The key to phase junctions for efficient charge separation is to consider both the phase alignment and interface structure. New insight into junction-based designs for efficient charge separation is vitally important for current solar energy conversion research. Herein, an anatase–rutile phase junction is elaborately introduced into TiO2 films by rapid thermal annealing treatment and the roles of phase junction on charge separation and transfer are studied in detail. A combined study of transient absorption spectroscopy, electrochemical and photoelectrochemical (PEC) measurements reveals that appropriate phase alignment is essential for unidirectional charge transfer, and a junction interface with minimized trap states is crucial to liberate the charge separation potential of the phase junction. By tailored control of phase alignment and interface structure, an optimized TiO2 film with an appropriately introduced phase junction shows superior performance in charge separation and transfer, hence achieving ca. 3 and 9 times photocurrent density enhancement compared to pristine anatase and rutile phase TiO2 electrodes, respectively. This work demonstrates the great potential of phase junctions for efficient charge separation and transfer in solar energy conversion applications.
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影响因子：
8.4
作者：
Wang Z;Qi Y;Ding C;Fan D;Liu G;Zhao Y;Li C
通讯作者：
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影响因子：
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作者：
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