In Situ Preparation of a Ti3+ Self-Doped TiO2 Film with Enhanced Activity as Photoanode by N2H4 Reduction
In Situ Preparation of a Ti3+ Self-Doped TiO2 Film with Enhanced Activity as Photoanode by N2H4 Reduction
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DOI：
10.1002/anie.201406017
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发表时间：
2014-09-22
影响因子：
16.6
通讯作者：
Feng, Pingyun
中科院分区：
文献类型：
--
作者：
Mao, Chengyu;Zuo, Fan;Feng, Pingyun
报道了一种制备Ti3+修饰的高稳定TiO2光阳极的新方法。以Ti箔作为导电衬底和Ti3+/Ti4+源，通过一步水热反应生长出一维蓝色Ti3+/TiO2晶体。在模拟AM 1.5 G照明下，在1.0 V vs RHE条件下，Ti3+的光电流密度高达0.64 mA cm(-2)，通过N2H4还原进一步调整了Ti3+的浓度，导致了更大的光电催化活性。电子顺磁共振和Mott-Schottky图显示，N2H4还原导致的载流子密度增加有助于观察到的改善。这种合成方法的通用性证明了它在改善其他类型的光阳极性能方面的有效性。通过将1D TiO2结构的优点与Ti3+自掺杂的优点相结合，本研究为制造高效的TiO2光阳极提供了一种通用的工具。
A new synthetic method to fabricate Ti3+-modified, highly stable TiO2 photoanodes for H2O oxidation is reported. With Ti foil as both the conducting substrate and the Ti3+/Ti4+ source, one-dimensional blue Ti3+/TiO2 crystals were grown by a one-step hydrothermal reaction. The concentration of Ti3+ was further tuned by N2H4 reduction, leading to a greater photoelectrocatalytic activity, as evidenced by a high photo-current density of 0.64 mA cm(-2) at 1.0 V vs RHE under simulated AM 1.5 G illumination. Electron paramagnetic resonance and Mott-Schottky plots reveal that higher charge-carrier density owing to N2H4 reduction contributes to the observed improvement. The generality of this synthesis method was demonstrated by its effectiveness in improving the performance of other types of photoanodes. By integrating the advantages of the 1D TiO2 architecture with those of Ti3+ self-doping, this work provides a versatile tool toward the fabrication of efficient TiO2 photoanodes.