Preparation of nanocrystalline palladium on p-Si by electroless deposition and its photo-electrochem

• 作 者: YAO Suwei LI He ZHANG Weiguo WANG Hongzhi BEN Yuheng
• 机 构: SUGIYAMA Laboratory of Surface Technology, School of Chemical Engineering and Technology, Tianjin Un
• 出 处: 稀有金属（英文版）
• 发表日期: 2006年3期
• 关键词: electrochemistry Pd-modified p-Si electrode electroless hydrogen evolution react

The Pd-modified p-Si electrode was prepared by means of electroless deposition. The average diameter of Pd nanoparticles was about 80 nm from SEM observations. XRD results showed that the structure of Pd coatings was nanocrystalline. The catalyzing properties of the Pd-modified p-Si electrode for hydrogen evolution under illumination and in dark were studied with the constant current polarization method. The polarization potential for hydrogen evolution reaction (HER) of the Pd/p-Si electrode under illumination was 250 mV lower than that in dark, and was 450 mV lower than that of p-Si in dark at the current density of 2.5 mA.cm-2. The results of electrochemistry impedance spectra (ELS) showed and the HER rate increased evidently.