A Keggin Polyoxometalate Shows Water Oxidation Activity at Neutral pH: POM@ZIF-8, an Efficient and Robust Electrocatalyst

Subhabrata Mukhopadhyay, Joyashish Debgupta, Chandani Singh, Aranya Kar, Samar K. Das

Research output: Contribution to journalArticlepeer-review

100 Scopus citations

Abstract

Keggin-type polyoxometalate anions [XM12O40]n− are versatile, as their applications in interdisciplinary areas show. The Keggin anion [CoW12O40]6− turns into an efficient and robust electrocatalyst upon its confinement in the well-defined void space of ZIF-8, a metal–organic framework (MOF). [H6CoW12O40]@ZIF-8 is so stable to water oxidation that it retains its initial activity even after 1000 catalytic cycles. The catalyst has a turnover frequency (TOF) of 10.8 mol O2(mol Co)−1 s−1, one of the highest TOFs for electrocatalytic oxygen evolution at neutral pH. Controlled experiments rule out the chances of formation and participation of CoOx in this electrocatalyic water oxidation.

Original languageEnglish
Pages (from-to)1918-1923
Number of pages6
JournalAngewandte Chemie - International Edition
Volume57
Issue number7
DOIs
StatePublished - 12 Feb 2018
Externally publishedYes

Keywords

  • electrocatalysis
  • Keggin polyoxometalates
  • neutral pH
  • water oxidation
  • ZIF-8 MOF

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