Perfect proton selectivity in ion transport through two-dimensional crystals.

Abstract:

:Defect-free monolayers of graphene and hexagonal boron nitride are surprisingly permeable to thermal protons, despite being completely impenetrable to all gases. It remains untested whether small ions can permeate through the two-dimensional crystals. Here we show that mechanically exfoliated graphene and hexagonal boron nitride exhibit perfect Nernst selectivity such that only protons can permeate through, with no detectable flow of counterions. In the experiments, we use suspended monolayers that have few, if any, atomic-scale defects, as shown by gas permeation tests, and place them to separate reservoirs filled with hydrochloric acid solutions. Protons account for all the electrical current and chloride ions are blocked. This result corroborates the previous conclusion that thermal protons can pierce defect-free two-dimensional crystals. Besides the importance for theoretical developments, our results are also of interest for research on various separation technologies based on two-dimensional materials.

journal_name

Nat Commun

journal_title

Nature communications

authors

Mogg L,Zhang S,Hao GP,Gopinadhan K,Barry D,Liu BL,Cheng HM,Geim AK,Lozada-Hidalgo M

doi

10.1038/s41467-019-12314-2

subject

Has Abstract

pub_date

2019-09-18 00:00:00

pages

4243

issue

1

issn

2041-1723

pii

10.1038/s41467-019-12314-2

journal_volume

10

pub_type

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