Graphene has recently been shown to be permeable to thermal protons, the nuclei of hydrogen atoms, which sparked interest in its use as a proton-conducting membrane in relevant technologies. However, the influence of light on proton permeation remains unknown. Here we report that proton transport through Pt-nanoparticle-decorated graphene can be enhanced strongly by illuminating it with visible light. Using electrical measurements and mass spectrometry, we find a photoresponsivity of 10^4 A W-1, which translates into a gain of 10^4 protons per photon with response times in the microsecond range. These characteristics are competitive with those of state-of-the-art photodetectors that are based on electron transport using silicon and novel two-dimensional materials. The photo-proton effect can be important for graphene's envisaged use in fuel cells and hydrogen isotope separation. Our observations can also be of interest for other applications such as light-induced water splitting, photocatalysis and novel photodetectors.
@article{arxiv.1801.04899,
title = {Giant photo-effect in proton transport through graphene membranes},
author = {Marcelo Lozada-Hidalgo and Sheng Zhang and Sheng Hu and Vasyl G. Kravets and Francisco J. Rodriguez and Alexey Berdyugin and Alexander Grigorenko and Andre K. Geim},
journal= {arXiv preprint arXiv:1801.04899},
year = {2018}
}