Defect Engineering in a Metal-Organic Framework System to Achieve Super-Protonic Conductivity

Olivia Basu, Subhabrata Mukhopadhyay, Subhajit Laha, Samar K. Das

Research output: Contribution to journalArticlepeer-review

33 Scopus citations

Abstract

Controlled incorporation of missing-linker defect sites could be achieved in four sister metal-organic frameworks (MOFs) of MOF-808, namely, MOF-808 A-D via modulated synthesis. An impressive enhancement in proton conductivity is observed in these sister MOFs (increase from 10-3to 10-1S cm-1) as compared to a highly crystalline, low-in-defect variant of MOF-808. MOF-808 C, having optimized defect density, shows a proton conductivity of 2.6 × 10-1S cm-1at 80 °C and 98% relative humidity-the highest value reported to date for pure MOF-based proton conductors without extensive structural modifications. The introduction of defects induces super-protonic conductivity by modifying different properties, like porosity, water sorptivity, and acidity. Furthermore, an assembly of this super proton-conducting MOF with Pt-a versatile hydrogen evolution reaction (HER) catalyst, has been studied with the objective to influence the catalytic activity. This MOF-catalyst assembly was found to have lower overpotential requirements, owing to an increase in local acidity and efficient proton management around the catalyst.

Original languageEnglish
Pages (from-to)6734-6743
Number of pages10
JournalChemistry of Materials
Volume34
Issue number15
DOIs
StatePublished - 9 Aug 2022
Externally publishedYes

ASJC Scopus subject areas

  • General Chemistry
  • General Chemical Engineering
  • Materials Chemistry

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