降级(电信)
催化作用
铂金
材料科学
透射电子显微镜
化学工程
电化学
燃料电池
纳米尺度
纳米技术
计算机科学
化学
电极
工程类
物理化学
电信
生物化学
作者
J. Meier,Carolina Galeano,Ioannis Katsounaros,Angel Angelov Topalov,Aleksander Kostka,Ferdi Schüth,Karl Johann Jakob Mayrhofer
摘要
This manuscript investigates the degradation of a Pt/Vulcan fuel cell catalyst under simulated start–stop conditions in an electrochemical half-cell. Identical location transmission electron microscopy (IL-TEM) is used to visualize the several different degradation pathways occurring on the same catalyst material under potential cycling conditions. The complexity of degradation on the nanoscale leading to macroscopic active surface area lossis demonstrated and discussed. Namely, four different degradation pathways at one single Pt/Vulcan aggregate are clearly observed. Furthermore, inhomogeneous degradation behavior for different catalyst locations is shown, and trends in degradation mechanisms related to the platinum particle size are discussed in brief. Attention is drawn to the vast field of parameters influencing catalyst stability. We also present the development of a new technique to study changes of the catalyst not only with 2D projections of standard TEM images but also in 3D. For this purpose, identical location tomography (IL-tomography) is introduced, which visualizes the 3D structure of an identical catalyst location before and after degradation.
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