Proton and Li-ion permeation through graphene with eight-atom-ring defects

Show simple item record Kalon, Gopinadhan et al. 2020-05-27T14:12:53Z 2020-05-27T14:12:53Z 2020-05
dc.identifier.citation Gopinadhan, Kalon et al., “Proton and Li-ion permeation through graphene with eight-atom-ring defects”, arXiv, Cornell University Library, DOI: arXiv:/2005.09418, May 2020. en_US
dc.description.abstract Defect-free graphene is impermeable to gases and liquids but highly permeable to thermal protons. Atomic-scale defects such as vacancies, grain boundaries and Stone-Wales defects are predicted to enhance graphene's proton permeability and may even allow small ions through, whereas larger species such as gas molecules should remain blocked. These expectations have so far remained untested in experiment. Here we show that atomically thin carbon films with a high density of atomic-scale defects continue blocking all molecular transport, but their proton permeability becomes ~1,000 times higher than that of defect-free graphene. Lithium ions can also permeate through such disordered graphene. The enhanced proton and ion permeability is attributed to a high density of 8-carbon-atom rings. The latter pose approximately twice lower energy barriers for incoming protons compared to the 6-atom rings of graphene and a relatively low barrier of ~0.6 eV for Li ions. Our findings suggest that disordered graphene could be of interest as membranes and protective barriers in various Li-ion and hydrogen technologies.
dc.description.statementofresponsibility by Kalon Gopinadhan et al.
dc.language.iso en_US en_US
dc.publisher Cornell University Library en_US
dc.title Proton and Li-ion permeation through graphene with eight-atom-ring defects en_US
dc.type Pre-Print en_US
dc.relation.journal arXiv

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