n-TiO2阴极电沉积纳米金属铂及其电化学特性

用两步法对钛基材进行阳极氧化，然后用阴极电沉积方法制备出纳米级铂镀层Ti／TiO2．Pt阳极，用场发射电子扫描显微镜（SE-SEM）分析了Pt沉积前后的表面形貌，并测试了其晶粒度。结果表明，Pt晶粒度大小为80nm～130nm，阳极不仅具有与铂阳极相似的电化学行为特征，而且通过Pt掺杂明显改善月．TiO2电极的电催化活性，并随着沉积Pt时间的增加，其电催化活性提高。

The Preparation and Characterization of Nanocrystalline Pt Films of Titanium Dioxide by Cathodic Electrodeposition

A two-step procedure was used for the preparation of the modified Ti/TiO2-Pt electrodes. The first step was anodisation of the titanium substrate to produce oxide film, and the second step was cathodic deposition Pt. The Ti/TiO2-Pt electrodes with nanocrystalline Pt films were obtained by galvanostatic deposit from H2PtCl4 and HCl solutions containing organic at 298 K~343 K. The mean grain sizes of Pt particles were 80 nm~130 nm. The surfaces of the as-prepared anodes before and after Pt coating were investigated by field emission scanning electron microscope scanning (FE-SEM) and X-ray diffraction (XRD). The parameters such as temperature and pH were discussed. The results show that the catalytic activity of n-TiO2 is remarkably improved by Pt doping and will increase further with prolonging of Pt deposition time.