Proton transport through one atom thick crystals
arXiv:1410.8724 · doi:10.1038/nature14015
Abstract
Graphene is impermeable to all gases and liquids, and even such a small atom as hydrogen is not expected to penetrate through graphene's dense electronic cloud within billions of years. Here we show that monolayers of graphene and hexagonal boron nitride (hBN) are unexpectedly permeable to thermal protons, hydrogen ions under ambient conditions. As a reference, no proton transport could be detected for a monolayer of molybdenum disulfide, bilayer graphene or multilayer hBN. At room temperature, monolayer hBN exhibits the highest proton conductivity with a low activation energy of about 0.3 eV but graphene becomes a better conductor at elevated temperatures such that its resistivity to proton flow is estimated to fall below 10^-3 Ohm per cm2 above 250 C. The proton barriers can be further reduced by decorating monolayers with catalytic nanoparticles. These atomically thin proton conductors could be of interest for many hydrogen-based technologies.
submitted, pre-edited version
References in corpus (6)
- Two Dimensional Atomic Crystals
- Graphene: A sub-nanometer trans-electrode membrane
- Atomically thin boron nitride: a tunnelling barrier for graphene devices
- Graphene: a perfect nanoballoon
- On resonant scatterers as a factor limiting carrier mobility in graphene
- Graphene as a transparent conductive support for studying biological molecules by transmission electron microscopy