Highly efficient proton conduction in the metal-organic framework material MFM-300(Cr).SO4(H3O)2

Research output: Contribution to journalArticlepeer-review

  • External authors:
  • Jim X. Chen
  • Qingqing Mei
  • Yinlin Chen
  • Christopher Marsh
  • Bing An
  • Ian P. Silverwood
  • Ming Li
  • Yongqiang Cheng
  • Meng He
  • Xi Chen
  • Weiyao Li
  • Danielle Crawshaw
  • Mark D. Frogley
  • Sarah J. Day
  • Victoria García Sakai
  • Pascal Manuel
  • Anibal J. Ramirez-Cuesta

Abstract

The development of materials showing rapid proton conduction with a low activation energy and stable performance over a wide temperature range is an important and challenging line of research. Here we report by confinement of sulfuric acid within porous MFM-300(Cr) to give MFM-300(Cr)-SO4(H3O)2, which exhibits a record-low activation energy of 0.04 eV, resulting in stable proton conductivity between 25 and 80 °C of >10-2 S·cm-1. In situ synchrotron X-ray powder diffraction (SXPD), neutron powder diffraction (NPD), quasi-elastic neutron scattering (QENS) and molecular dynamics (MD) simulation reveal the pathways of proton transport and the molecular mechanism of proton diffusion within the pores. Confined sulfuric acid species together with adsorbed water molecules play a critical role in promoting the proton transfer through this robust network to afford a material in which proton conductivity is almost temperature-independent.

Bibliographical metadata

Original languageEnglish
JournalJournal of the American Chemical Society
Publication statusPublished - 2022