A Single Potassium-Ion Conducting Metal-Organic Framework

Yu Juan Gu, Yi An Lo, An Che Li, Yu Chuan Chen, Jun Hong Li, Yi Sen Wang, Hong Kang Tian, Watchareeya Kaveevivitchai, Chung Wei Kung

Research output: Contribution to journalArticlepeer-review


In this study, the 4-sulfobenzoic acid potassium salt is postsynthetically immobilized on the hexa-zirconium nodes of a zirconium-based MOF, MOF-808, by the solution-phase solvent-assisted ligand incorporation approach. With all of the sulfonate-based anions firmly immobilized within the rigid framework of MOF-808 along with mobile potassium ions present in the resulting material (MOF-808-SO3K), the MOF-808-SO3K-based solid-state electrolyte achieves an ionic conductivity of 3.1 × 10-5S/cm at 303 K, a low activation energy of 0.32 eV, and a high transference number of 0.76 for potassium ions. The compound shows good long-term cycling stability with potassium metal during the charge-discharge processes. First-principles calculations are further performed to probe the structure of MOF-808-SO3K and gain insights into the ionic conduction of potassium ions in MOF-808-SO3K.

Original languageEnglish
Pages (from-to)8573-8580
Number of pages8
JournalACS Applied Energy Materials
Issue number7
Publication statusPublished - 2022 Jul 25

All Science Journal Classification (ASJC) codes

  • Chemical Engineering (miscellaneous)
  • Energy Engineering and Power Technology
  • Electrochemistry
  • Materials Chemistry
  • Electrical and Electronic Engineering


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