Tunable Anion-Selective Transport through Monolayer Graphene and Hexagonal Boron Nitride

Caglar, Mustafa; Silkina, Inese; Brown, Bertram T.; Thorneywork, Alice L.; Burton, Oliver J.; Babenko, Vitaliy; Gilbert, Stephen Matthew; Zettl, Alex; Hofmann, Stephan; Keyser, Ulrich F.

doi:10.1021/acsnano.9b08168

Title: Tunable Anion-Selective Transport through Monolayer Graphene and Hexagonal Boron Nitride

Journal Article · 30 December 2019 · ACS Nano

DOI: https://doi.org/10.1021/acsnano.9b08168 · OSTI ID:1760225

^[1]; Silkina, Inese ^[2]; Brown, Bertram T. ^[1]; Thorneywork, Alice L. ^[1]; Burton, Oliver J. ^[2]; Babenko, Vitaliy ^[2]; Gilbert, Stephen Matthew ^[3]; Zettl, Alex ^[3];

^[2]; Keyser, Ulrich F. ^[1]

Univ. of Cambridge (United Kingdom). Cavendish Lab.
Univ. of Cambridge (United Kingdom)
Univ. of California, Berkeley, CA (United States); Lawrence Berkeley National Lab. (LBNL), Berkeley, CA (United States)

Membranes that selectively filter for both anions and cations are central to technological applications from clean energy generation to desalination devices. 2D materials have immense potential as these ion-selective membranes due to their thinness, mechanical strength, and tunable surface chemistry; however, currently, only cation-selective membranes have been reported. Here we demonstrate the controllable cation and anion selectivity of both monolayer graphene and hexagonal boron nitride. In particular, we measure the ionic current through membranes grown by chemical vapor deposition containing well-known defects inherent to scalably produced and wet-transferred 2D materials. We observe a striking change from cation selectivity with monovalent ions to anion selectivity by controlling the concentration of multivalent ions and inducing charge inversion on the 2D membrane. Furthermore, we find good agreement between our experimental data and theoretical predictions from the Goldman-Hodgkin-Katz equation and use this model to extract selectivity ratios. These tunable selective membranes conduct up to 500 anions for each cation and thus show potential for osmotic power generation.

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Research Organization:: Lawrence Berkeley National Laboratory (LBNL), Berkeley, CA (United States)

Sponsoring Organization:: USDOE Office of Science (SC), Basic Energy Sciences (BES)

Grant/Contract Number:: AC02-05CH11231

OSTI ID:: 1760225

Journal Information:: ACS Nano, Journal Name: ACS Nano Journal Issue: 3 Vol. 14; ISSN 1936-0851

Publisher:: American Chemical Society (ACS)Copyright Statement

Country of Publication:: United States

Language:: English

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37 INORGANIC, ORGANIC, PHYSICAL, AND ANALYTICAL CHEMISTRY
Defects
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anion-selective
charge inversion
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two dimensional materials

Title: Tunable Anion-Selective Transport through Monolayer Graphene and Hexagonal Boron Nitride

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