pH sensitivity of interfacial electron transfer at a supported graphene monolayer

0509424 - FZÚ 2020 RIV GB eng J - Journal Article
Wehrhold, M. - Neubert, T.J. - Yadav, A. - Vondráček, Martin - Iost, R.M. - Honolka, Jan - Balasubramanian, K.
pH sensitivity of interfacial electron transfer at a supported graphene monolayer.
Nanoscale. Roč. 11, č. 31 (2019), s. 14742-14756. ISSN 2040-3364. E-ISSN 2040-3372
R&D Projects: GA MŠMT(CZ) LM2015088
Institutional support: RVO:68378271
Keywords : electrochemistry * graphene * sensors * electrocapalisys * Raman spectroscopy * XPS
OECD category: Electrochemistry (dry cells, batteries, fuel cells, corrosion metals, electrolysis)
Impact factor: 6.895, year: 2019
Method of publishing: Limited access
https://doi.org/10.1039/c9nr05049c

Electrochemical devices based on a single graphene monolayer are often realized on a solid support such as silicon oxide, glassy carbon or a metal film. Here, we show that, with graphene on insulating substrates, the kinetics of the electron transfer at graphene with various redox active molecules is dictated by solution pH for electrode reactions that are not proton dependent. We attribute the origin of this unusual phenomenon mainly to lectrostatic effects between dissolved/dissociated redox species and the interfacial charge due to trace amounts of ionizable groups at the supported graphene–liquid interface.
Permanent Link: http://hdl.handle.net/11104/0300179