Electrochemical Behavior of Graphene in a Deep Eutectic Solvent

Author(s)
David Fuchs, Bernhard C. Bayer, Tushar Gupta, Gabriel L. Szabo, Richard A. Wilhelm, Dominik Eder, Jannik C. Meyer, Sandra Steiner, Bernhard Gollas
Abstract

Graphene electrodes and deep eutectic solvents (DESs) are two emerging material systems that have individually shown highly promising properties in electrochemical applications. To date, however, it has not been tested whether the combination of graphene and DESs can yield synergistic effects in electrochemistry. We therefore study the electrochemical behavior of a defined graphene monolayer of centimeter-scale, which was produced by chemical vapor deposition and transferred onto insulating SiO2/Si supports, in the common DES choline chloride/ethylene glycol (12CE) under typical electrochemical conditions. We measure the graphene potential window in 12CE and estimate the apparent electron transfer kinetics of an outer-sphere redox couple. We further explore the applicability of the 12CE electrolyte to fabricate nanostructured metal (Zn) and metalloid (Ge) hybrids with graphene by electrodeposition. By comparing our graphene electrodes with common bulk glassy carbon electrodes, a key finding we make is that the two-dimensional nature of the graphene electrodes has a clear impact on DES-based electrochemistry. Thereby, we provide a first framework toward rational optimization of graphene-DES systems for electrochemical applications.

Organisation(s)
Physics of Nanostructured Materials
External organisation(s)
Technische Universität Graz, Technische Universität Wien
Journal
ACS Applied Materials and Interfaces
Volume
12
Pages
40937-40948
No. of pages
12
ISSN
1944-8244
DOI
https://doi.org/10.1021/acsami.0c11467
Publication date
09-2020
Peer reviewed
Yes
Austrian Fields of Science 2012
103018 Materials physics, 104011 Materials chemistry
Keywords
Portal url
https://ucris.univie.ac.at/portal/en/publications/electrochemical-behavior-of-graphene-in-a-deep-eutectic-solvent(85af2b35-ef04-4c17-ba77-aa6476db8833).html