ETEM Studies of Electrodes and Electro-catalysts

ETEM Studies of Electrodes and Electro-catalysts
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电极和电催化剂的 ETEM 研究

DOI:
10.1007/978-3-319-22988-1_11
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发表时间:
2016
期刊:
影响因子:
--
通讯作者:
V. Roddatis
V. Roddatis
中科院分区:
--
文献类型:
--
作者:
Ch. Jooss;S. Mildner;M. Beleggia;D. Mierwaldt;V. Roddatis

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环境TEM是一个很好的工具,用于深入了解在操作条件下的电催化剂的原子和电子结构。在一些开创性的实验中研究了几种电化学反应,如电极的氧化/还原过程,水分解/析氧的非均相气相催化和材料的电化学腐蚀过程,这些实验将在本章中进行总结。这些实验经常揭示由于从环境中吸附气体物质以及由于电子束的影响而引起的电极的强烈变化。我们表明,非弹性散射的高能电子可以诱导电势在所研究的样品中影响所观察到的状态的催化剂。介绍电化学和ETEM调查后,我们地址,实验和理论上,束诱导电位,其依赖于几个参数,如电子通量,电导率和样品的几何形状,旨在学习如何解开他们的辐射损伤。我们的第二个重点是通过专用的电子TEM样品架控制样品内部和周围的电势分布。为了说明这是如何实现的,我们提出了一个偏压控制的电腐蚀实验的结果。我们将讨论一些主要的实验和理论的挑战,在透射电子显微镜控制电化学研究的发展。
Environmental TEM is an excellent tool for gaining insight into the atomic and electronic structure of electro-catalysts under operating conditions. Several electrochemical reactions such as oxidation/reduction processes of electrodes, heterogeneous gas phase catalysis of water splitting/oxygen evolution and electrochemical corrosion processes of materials have been studied in some pioneering experiments which will be summarized in this chapter. These experiments often reveal a strong change of the electrode due to the adsorption of gas species from the environment as well as due to the impact of the electron beam. We show that inelastic scattering of the high-energy electrons can induce electric potentials in the studied samples influencing the observed state of the catalyst. After an introduction to electrochemistry and ETEM investigations, we address, experimentally and theoretically, beam-induced potentials, their dependence on several parameters such as electron flux, electric conductivity, and geometry of samples, aiming at learning how to disentangle them from radiation damage. Our second focus is to control the electric potential distribution within and around samples by dedicated electrical TEM sample holders. To illustrate how this can be achieved, we present the results of a bias-controlled electro-corrosion experiment. We will discuss some of the main experimental and theoretical challenges for the development of controlled electrochemistry studies in transmission electron microscopes.
DOI: 10.3390/catal4020129
发表时间: 2014-06-01
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影响因子: 3.9
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DOI: 10.1088/0022-3727/11/17/002
发表时间: 1978
期刊: Journal of Physics D
影响因子: --
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发表时间: 1959
期刊: Annalen der Physik
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DOI: --
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DOI: --
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