• 文献标题:   Proton and Li-Ion Permeation through Graphene with Eight-Atom-Ring Defects
  • 文献类型:   Article
  • 作  者:   GRIFFIN E, MOGG L, HAO GP, KALON G, BACAKSIZ C, LOPEZPOLIN G, ZHOU TY, GUAROCHICO V, CAI JH, NEUMANN C, WINTER A, MOHN M, LEE JH, LIN JH, KAISER U, GRIGORIEVA IV, SUENAGA K, OZYILMAZ B, CHENG HM, REN WC, TURCHANIN A, PEETERS FM, GEIM AK, LOZADAHIDALGO M
  • 作者关键词:   graphene, disorder, lithium ion, proton, fuel cell, battery
  • 出版物名称:   ACS NANO
  • ISSN:   1936-0851 EI 1936-086X
  • 通讯作者地址:   Univ Manchester
  • 被引频次:   1
  • DOI:   10.1021/acsnano.0c02496
  • 出版年:   2020

▎ 摘  要

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 similar to 1000 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 eight-carbon-atom rings. The latter pose approximately twice lower energy barriers for incoming protons compared to that of the six-atom rings of graphene and a relatively low barrier of similar to 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.