Anhydrous Superprotonic Conductivity of a Uranyl-Based MOF from Ambient Temperature to 110 °c

Kun Zhang, Ge Hua Wen, Xiao Jing Yang, Dae Woon Lim, Song Song Bao, Masaki Donoshita, Lan Qing Wu, Hiroshi Kitagawa, Li Min Zheng

Research output: Contribution to journalArticlepeer-review

29 Citations (Scopus)

Abstract

Developing proton-conducting electrolytes that are usable over a wide temperature range (25-150 °C) is highly desirable to enhance the efficiency of fuel cells for on-board automotive applications. Increasing the stability of water above its boiling point is considered one possible method to maintain the hydrogen bond network in composite materials for fast proton conduction. We herein propose an approach to encapsulate LiBr into a negatively charged metal-organic framework of (H3O)[(UO2)4(2-pmb)3(H2O)3]·0.5H2O (1) [2-pmbH3 = 2-(phosphonomethyl)benzoic acid] to enhance the water stability at high temperatures and inhibit the migration of Li ions by Coulombic interactions induced by anionic skeletons. The resulting composite shows a superprotonic conductivity of over 10-2 S cm-1 and a low activation energy of less than 0.4 eV in an anhydrous N2 atmosphere from ambient temperature to 110 °C. Diffusion coefficient tests confirm that protons, rather than lithium ions, are the main contributor to conductivity.

Original languageEnglish
Pages (from-to)744-751
Number of pages8
JournalACS Materials Letters
Volume3
Issue number6
DOIs
Publication statusPublished - Jun 7 2021

All Science Journal Classification (ASJC) codes

  • General Chemical Engineering
  • Biomedical Engineering
  • General Materials Science

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