journal article·2020-12-16

Probing Electrified Liquid–Solid Interfaces with Scanning Electron Microscopy

Hongxuan Guo, Alexander Yulaev, Evgheni Strelcov, Alexander Tselev, Christopher Arble, Andras E. Vladar, John S. Villarrubia, Andrei Kolmakov

ACS Applied Materials & Interfaces· Volume 12· Issue 50
Publisher page

Abstract

Electrical double layers play a key role in a variety of electrochemical systems. The mean free path of secondary electrons in aqueous solutions is on the order of a nanometer, making them suitable for probing ultrathin electrical double layers at solid-liquid electrolyte interfaces. Employing graphene as an electron-transparent electrode in a two-electrode electrochemical system, we show that the secondary electron yield of the graphene-liquid interface depends on the ionic strength and concentration of the electrolyte and the applied bias at the remote counter electrode. These observations have been related to polarization-induced changes in the potential distribution within the electrical double layer and demonstrate the feasibility of using scanning electron microscopy to examine and map electrified liquid-solid interfaces.
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Research context

OpenAlex topics: Electrochemical Analysis and Applications · Analytical Chemistry and Sensors · Iron oxide chemistry and applications

SciVX discovery tags are terminology-based. OpenAlex topics are source-provided classifications.

Affiliations

SEU-FEI Nano-Pico Center, Key Laboratory of MEMS of Ministry of Education, Southeast University, Nanjing 210096, P. R. China

Physical Measurement Laboratory, National Institute of Standards and Technology, Gaithersburg, Maryland 20899, United States

Maryland Nanocenter, University of Maryland, College Park, Maryland 20742, United States

Department of Physics and CICECO—Aveiro Institute of Materials, University of Aveiro, Aveiro 3810-193, Portugal

Funding

National Institute of Standards and Technology · University of Maryland · Funda??o para a Ci?ncia e a Tecnologia

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