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PreprintCC BYChemRxiv

Novel green K-based Metal-Organic Framework with high proton conductivity

  • Pablo Salcedo-Abraira1
  • José M. Zubeldia-Gutiérrez1
  • Catalina Biglione2
  • Amalia GarcíaGarcía1
  • Clara Garrido1
  • Sydonne Swaby3
  • Fabrice Salles4,5
  • María Teresa Pérez-Prior3
  • Belén Levenfeld3
  • Alejandro Várez3
  • Antonio Rodríguez-Diéguez1
  • Patricia Horcajada2
1 more authors
  • Sara Rojas1
5 affiliations
  1. 1Department of Inorganic Chemistry, Faculty of Science, University of Granada, Av. Fuentenueva s/n, Granada, Spain, 18071
  2. 2Advanced Porous Materials Unit, IMDEA Energy Institute, Avda. Ramón de la Sagra 3, Móstoles, Madrid, Spain, 28935
  3. 3IAAB, Universidad Carlos III de Madrid, Avda. Universidad 30, Madrid, Spain, E-28911
  4. 4ICGM
  5. 5ENSCM
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Abstract

Despite growing interest in metal-organic frameworks (MOFs for protonconductivity applications, monovalent-cation-based MOFs remain comparatively underexplored due to the weaker coordination interactions typically associated with these systems. In this work, we report GR-MOF-28, a novel potassium-based naphthalene tetracarboxylate framework synthesized under mild aqueous conditions at room temperature. Structurally, GR-MOF-28 consists of K2O10 dioctahedra interconnected through tetracarboxylate ligands and coordinated water molecules, generating a confined hydrogen-bond network along the crystallographic channels. The material exhibits proton conductivity values up to 4.3·10-2 S·cm-1 under high relative humidity conditions, placing it among the highest-performing K-based MOFs reported to date. Combined electrochemical impedance spectroscopy and molecular simulations support a water-mediated Grotthusstype proton transport mechanism through the confined hydrogen-bond network. In addition, GR-MOF-28 can be incorporated into a conductive polymer matrix without loss of proton transport properties. These results highlight the potential of underexplored K-based coordination frameworks as proton-conducting materials.

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Cite

BibTeXRIS
BibTeX
@misc{salcedoabraira2026novel,
  title = {{Novel green K-based Metal-Organic Framework with high proton conductivity}},
  author = {Pablo Salcedo-Abraira and José M. Zubeldia-Gutiérrez and Catalina Biglione and Amalia GarcíaGarcía and Clara Garrido and Sydonne Swaby and Fabrice Salles and María Teresa Pérez-Prior and Belén Levenfeld and Alejandro Várez and Antonio Rodríguez-Diéguez and Patricia Horcajada and Sara Rojas},
  howpublished = {ChemRxiv},
  year = {2026},
  month = sep,
  doi = {10.26434/chemrxiv.15008452/v1},
  url = {https://chemrxiv.org/doi/full/10.26434/chemrxiv.15008452/v1},
  note = {CC BY},
}
RIS
TY  - UNPB
TI  - Novel green K-based Metal-Organic Framework with high proton conductivity
AU  - Pablo Salcedo-Abraira
AU  - José M. Zubeldia-Gutiérrez
AU  - Catalina Biglione
AU  - Amalia GarcíaGarcía
AU  - Clara Garrido
AU  - Sydonne Swaby
AU  - Fabrice Salles
AU  - María Teresa Pérez-Prior
AU  - Belén Levenfeld
AU  - Alejandro Várez
AU  - Antonio Rodríguez-Diéguez
AU  - Patricia Horcajada
AU  - Sara Rojas
PY  - 2026
DA  - 2026/09/07
PB  - ChemRxiv
DO  - 10.26434/chemrxiv.15008452/v1
UR  - https://chemrxiv.org/doi/full/10.26434/chemrxiv.15008452/v1
AB  - Despite growing interest in metal-organic frameworks (MOFs for protonconductivity applications, monovalent-cation-based MOFs remain comparatively underexplored due to the weaker coordination interactions typically associated with these systems. In this work, we report GR-MOF-28, a novel potassium-based naphthalene tetracarboxylate framework synthesized under mild aqueous conditions at room temperature. Structurally, GR-MOF-28 consists of K2O10 dioctahedra interconnected through tetracarboxylate ligands and coordinated water molecules, generating a confined hydrogen-bond network along the crystallographic channels. The material exhibits proton conductivity values up to 4.3·10-2 S·cm-1 under high relative humidity conditions, placing it among the highest-performing K-based MOFs reported to date. Combined electrochemical impedance spectroscopy and molecular simulations support a water-mediated Grotthusstype proton transport mechanism through the confined hydrogen-bond network. In addition, GR-MOF-28 can be incorporated into a conductive polymer matrix without loss of proton transport properties. These results highlight the potential of underexplored K-based coordination frameworks as proton-conducting materials.
ER  -