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

doi:10.1002/anie.201711920

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^*

^*Corresponding author for this work

Chemistry

Research output: Contribution to journal › Article › peer-review

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 CoO_x in this electrocatalyic water oxidation.

Original language	English
Pages (from-to)	1918-1923
Number of pages	6
Journal	Angewandte Chemie - International Edition
Volume	57
Issue number	7
DOIs	https://doi.org/10.1002/anie.201711920
Publication status	Published - 12 Feb 2018

Keywords

electrocatalysis
Keggin polyoxometalates
neutral pH
water oxidation
ZIF-8 MOF

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

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.",

keywords = "electrocatalysis, Keggin polyoxometalates, neutral pH, water oxidation, ZIF-8 MOF",

author = "Subhabrata Mukhopadhyay and Joyashish Debgupta and Chandani Singh and Aranya Kar and Das, {Samar K.}",

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AU - Debgupta, Joyashish

AU - Singh, Chandani

AU - Kar, Aranya

AU - Das, Samar K.

PY - 2018/2/12

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AB - 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.

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KW - Keggin polyoxometalates

KW - neutral pH

KW - water oxidation

KW - ZIF-8 MOF

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

Abstract

Keywords

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