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A Keggin Polyoxometalate Shows Water Oxidation Activity at Neutral pH: POM@ZIF‐8, an Efficient and Robust Electrocatalyst
Author(s) -
Mukhopadhyay Subhabrata,
Debgupta Joyashish,
Singh Chandani,
Kar Aranya,
Das Samar K.
Publication year - 2018
Publication title -
angewandte chemie international edition
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 5.831
H-Index - 550
eISSN - 1521-3773
pISSN - 1433-7851
DOI - 10.1002/anie.201711920
Subject(s) - polyoxometalate , electrocatalyst , catalysis , keggin structure , chemistry , inorganic chemistry , oxygen evolution , metal organic framework , water splitting , materials science , electrochemistry , electrode , photocatalysis , organic chemistry , adsorption
Keggin‐type polyoxometalate anions [XM 12 O 40 ] n − are versatile, as their applications in interdisciplinary areas show. The Keggin anion [CoW 12 O 40 ] 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). [H 6 CoW 12 O 40 ]@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 O 2 (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 CoO x in this electrocatalyic water oxidation.