Nanocrystalline TiO2 particles were synthesized via hydrothermal method.Titanium isopropoxide was used as precursor and tetraethylammonium hydroxide was chosed as peptizer.The effect of tetraethylammonium hydroxide concentration and autoclaving temperature were studied.TiO2 particle size, crystal phase and morphology were characterized by XRD, TEM, Raman spectroscopy.The as-synthesized TiO2 particles were highly crystallized pure anatase with an elongated truncated tetragonal shape because of the oxygenated surface caused by alkaline condition, which indicated a large percentage of (101) and (001) facets that were thermodynamically stable.Dye sensitized solar cells were fabricated based on TiO2 particles with an average particle size about 14 nm.The electron transport properties are investigated by electrochemical impedance spectroscopy (EIS).A 7% power conversion efficiency was achieved under standard AM 1.5 sunlight.%通过碱性环境水热法制备了TiO2纳米颗粒,以异丙醇钛作为钛源,四乙基氢氧化铵作为碱性解胶剂.研究了四乙基氢氧化铵的浓度以及水热温度对TiO2纳米颗粒的影响.通过XRD、TEM对合成的TiO2晶粒尺寸、晶相以及形貌进行了表征.实验结果表明,使用四乙基氢氧化铵作为解胶剂,合成的TiO2颗粒由纯锐钛矿相组成,形状呈拉长的截断四方双锥结构.由于解胶的碱性环境,在TiO2的表面形成了富氧表面,使得在TiO2纳米颗粒表面更多的是热动力学稳定性更好的(101)和(001)面.制备的平均粒径大小为14 nm的TiO2纳米颗粒用于染料敏化太阳能电池中作为光阳极.通过电化学阻抗谱(EIS)分析了此种TiO2颗粒的电子传输特性.在AM1.5的模拟太阳光下,使用这种TiO2纳米颗粒作为光阳极的染料敏化太阳能电池获得了超过7％的光电转换效率.
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