Gate-controlled suppression of light-driven proton transport through graphene electrodes

S. Huang, E. Griffin (), J. Cai, B. Xin, J. Tong, Y. Fu, V. Kravets, F. M. Peeters and M. Lozada-Hidalgo ()
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S. Huang: The University of Manchester
E. Griffin: The University of Manchester
J. Cai: The University of Manchester
B. Xin: The University of Manchester
J. Tong: The University of Manchester
Y. Fu: The University of Manchester
V. Kravets: The University of Manchester
F. M. Peeters: Universidade Federal do Ceara
M. Lozada-Hidalgo: The University of Manchester

Nature Communications, 2023, vol. 14, issue 1, 1-7

Abstract: Abstract Recent experiments demonstrated that proton transport through graphene electrodes can be accelerated by over an order of magnitude with low intensity illumination. Here we show that this photo-effect can be suppressed for a tuneable fraction of the infra-red spectrum by applying a voltage bias. Using photocurrent measurements and Raman spectroscopy, we show that such fraction can be selected by tuning the Fermi energy of electrons in graphene with a bias, a phenomenon controlled by Pauli blocking of photo-excited electrons. These findings demonstrate a dependence between graphene’s electronic and proton transport properties and provide fundamental insights into molecularly thin electrode-electrolyte interfaces and their interaction with light.

Date: 2023
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DOI: 10.1038/s41467-023-42617-4

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