高分辨率透射电子显微镜
循环伏安法
化学
伏安法
催化作用
高氯酸
电催化剂
电化学
无机化学
分析化学(期刊)
透射电子显微镜
材料科学
纳米技术
电极
物理化学
有机化学
作者
Hendrik Schulenburg,Julien Durst,E. Müller,Alexander Wokaun,Günther G. Scherer
标识
DOI:10.1016/j.jelechem.2010.02.005
摘要
An error analysis for real surface area (Am) measurements of Pt3Co/C catalysts is presented. The real surface area was measured by X-ray diffraction (XRD), high resolution transmission electron microscopy (HRTEM), desorption of underpotential deposited hydrogen (Hupd) and CO-stripping voltammetry. All measurements were carried out after an electrochemical activation by cyclic voltammetry in perchloric acid. The real surface area decreases in the sequence Am(XRD) ∼ Am(HRTEM) > Am(CO-stripping) ∼ Am(Hupd). HRTEM provides the highest reliability of the investigated methods. The electrochemical methods are questionable for Pt3Co/C catalysts. They yield surface areas which are 23–30% lower than determined by HRTEM. The surface coverage of adsorbed H and CO is apparently lower on Pt3Co compared to Pt nanoparticles. Cyclic voltammetry of Pt3Co/C in alkaline electrolyte suggests that the surface of acid leached Pt3Co nanoparticles consists of pure Pt.
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