Issue 23, 2022

A rare polyoxometalate cluster [NiW12O44]14− based solid as a pre-catalyst for efficient and long-term oxygen evolution

Abstract

Polyoxometalates (POMs) are an eminent class of metal oxide anionic clusters of early transition metals with huge structural diversity. Herein, a [NiW12O44]14− cluster based solid, (C5H7N2)6[NiW12O44], has been reported (PS-78). The [NiW12O44]14− cluster bridges the missing gap of 1 : 12 hetero-POMs of Keggin and Silverton together with a coordination number of 8 of the central heteroatom (Ni). Furthermore PS-78 has been explored as an efficient and highly sustained oxygen evolution pre-catalyst in alkaline medium with an overpotential of 347 mV to attain a current density of 10 mA cm−2 and long-term stability up to 96 hours. Furthermore, mechanistic investigation showed that in situ generated NiO and WOx (x = 1, 2) species act as active species for the oxygen evolution reaction. This study will open up new avenues for exploring POMs' new topologies and the potential of POMs as effective pre-catalysts in electrocatalytic applications.

Graphical abstract: A rare polyoxometalate cluster [NiW12O44]14− based solid as a pre-catalyst for efficient and long-term oxygen evolution

Supplementary files

Article information

Article type
Communication
Submitted
21 Sep 2022
Accepted
11 Oct 2022
First published
13 Oct 2022
This article is Open Access
Creative Commons BY license

Nanoscale Adv., 2022,4, 5015-5020

A rare polyoxometalate cluster [NiW12O44]14− based solid as a pre-catalyst for efficient and long-term oxygen evolution

P. Sood, A. Joshi and M. Singh, Nanoscale Adv., 2022, 4, 5015 DOI: 10.1039/D2NA00646D

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