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Journal Highlights


Materials Applications


Electrochemical Behavior of Carbon Electrodes for in situ Redox Studies in a Transmission Electron Microscope by R Girod, N Nianias, V Tileli, Microsc Microanal | doi:10.1017/S1431927619015034 Implementation of liquid cell transmission electron micros-


copy (TEM) toward the study of electrocatalytic reactions is hindered by the reactivity of metallic substrates. Carbon elec- trodes are used for their inertness in bulk electrocatalytic mea- surements, however,


their performance can be significantly


modified when they are microfabricated on chips for TEM. Here, we characterized the electrochemical behavior of carbon-coated electrodes in a microfluidic cell. We first used cyclic voltamme- try to study the effects of scan rate, flow rate, and liquid layer thickness on the electrochemical response of the substrates. To relate the potentials with bulk values, we then implemented a system using a bulk reference electrode in series. We used this configuration and an open-cell setup to study the capabilities of the substrates for a range of energy conversion reactions, includ- ing CO2


reduction reaction (see figure). Our results demonstrate


that, compared to platinum electrodes, the carbon-coated ones systematically exhibit a wider inert potential window. Tis work provides a basis for interpretation of microscale electrocatalytic redox reactions in the TEM.


Scanning electron micrograph showing the scale of carbon-coated band elec- trodes on the electron transparent window of a chip (top). Comparison of elec- trochemical activities of carbon-coated and platinum microelectrodes with a bulk glassy carbon (GC) (bottom).


2020 January • www.microscopy-today.com


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