以偏钨酸铵为钨源、十六烷基三甲基溴化铵为表面活性剂,采用水热法制备纳米WO3粉体,并在不同温度下进行煅烧处理,通过添加分散剂、粘结剂等配制WO3浆料,利用刮涂法制备纳米多孔WO3薄膜电极.通过TG-DTA、XRD、SEM、BET以及UV-vis吸收光谱等手段对样品进行表征,采用Mott-Schottky测试、稳态光电流谱和交流阻抗谱等方法研究WO3薄膜电极的光电化学性能.结果表明:所制备的WO3为单斜型,随着热处理温度的升高,WO3粉体结晶度增高,颗粒粒径增大,比表面积下降；将热处理温度为650℃的WO3粉体制得的薄膜呈多孔膨松状结构,其平带电位为0.45 V,载流子浓度为3.445×1020 cm-3,光电流密度达2.50 mA/cm2.此外,进一步探讨颗粒尺寸对其光电性质的影响及其机理.%Tungsten trioxide nanoparticles were synthesized by a hydrothermal method using ammonium metatungstate as tungsten source and cetyl-trimethyl ammonium bromide as surfactant with subsequent calcination treatment at different temperatures. The as-prepared WO3 nanoparticles were mixed with dispersing agent and binder to obtain WO3 paste, which was then coated on FTO substrate to fabricate nanocrystalline porous WO3 films by the doctor-blade method. The obtained materials were characterized by means of TG-DTA, XRD, SEM, BET and UV-vis absorption. The photoelectrochemical properties of the WO3 film electrodes were investigated by Mott-Schottky, photocurrent-potential curve and electrochemical impedance spectroscopy (EIS) analysis. The results indicate that the films are crystalline with a monoclinic and porous structure, and the size of WO3 increases at elevated calcination temperature. The sample prepared using WO3 powders calcined at 650 ℃ shows that the flat band potential, donor carrier density, and photocurrent density are 0.46 V, 3.445 × 1020 cm-3 and 2.50 mA/cm2, respectively. The effect of different particle sizes on the photoelectrochemical properties of the WO3 films was also investigated.
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