石英晶体微天平
电催化剂
成核
电化学
法拉第效率
催化作用
化学
无机化学
沉积(地质)
过渡金属
化学工程
电极
物理化学
吸附
有机化学
生物
工程类
古生物学
沉积物
作者
Deng Lu-lu KE Xi,Guofeng Cui
出处
期刊:高等学校化学研究(英文版)
日期:2010-07-27
卷期号:26 (3): 443-448
摘要
Pd was electrochemically deposited on gold-coated quartz crystals at nanogram-level. The coulombic efficiency and initial nucleation and growth mechanism of potentiostatic Pd deposition were investigated via in situ electrochemical quartz crystal microbalance(EQCM). The coulombic efficiencies are 84%, 93% and 95% for Pd deposition at 0.3, 0.2 and 0.1 V(vs. SCE), respectively. The results of chronoamperometric measurements show that the Pd deposition proceeded by an instantaneous nucleation(at 0.3 V) or progressive nucleation(at 0.2 and 0.1 V) in a three-dimensional(3D) growth mode. The catalytic activity of Pd-based electrocatalyst for ethanol oxidation was characterized in an alkaline solution. It was found that the highest mass activity for ethanol oxidation on Pd-based electrocatalyst is 1.8×104 A/(g Pd) deposited at 0.3 V for 5 s.
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