Hydrogen Crossover Flux through Two-Dimensional Nanomaterials

Karli Gaffrey, Saheed Bukola, Jeff Blackburn, Bryan Pivovar

Research output: Contribution to journalArticlepeer-review

Abstract

Energy storage and conversion devices require an ion-exchange membrane with high transmission of charge-balancing ions and separation of anode and cathode electrolytes/gases. This ensures optimum device performance. Most conventional membranes suffer huge cross-permeation resulting in low energy efficiency and material degradation. This work investigated hydrogen permeability and proton transmission through membrane electrode assemblies (MEAs) containing a monolayer of hexagonal boron nitride and single-layer and bi-layer graphene in a gas-phase small-scale cell and a liquid cell. We found that the hydrogen crossover flux through MEAs with 2D materials was inhibited by at least a factor of 5 compared to the one without. Single-layer graphene and boron nitride enabled high proton transmission, but bi-layer graphene inhibited proton conduction. Defect visualization of 2D materials revealed few atomic-scale defects in graphene. These findings suggest that a monolayer of 2D material may provide good selectivity for energy conversion and storage devices by blocking species crossover while allowing high proton transmission.

Original languageAmerican English
Pages (from-to)285-294
Number of pages10
JournalECS Transactions
Volume109
Issue number9
DOIs
StatePublished - 2022
Event242nd ECS Meeting - Atlanta, United States
Duration: 9 Oct 202213 Oct 2022

Bibliographical note

Publisher Copyright:
© 2022 ECS - The Electrochemical Society.

NREL Publication Number

  • NREL/JA-5900-84625

Keywords

  • 2D materials
  • hydrogen crossover flux
  • hydrogen permeability
  • membrane electrode assemblies
  • proton transmission

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