A rare polyoxometalate cluster [NiW12O44]14− based solid as a pre-catalyst for efficient and long-term oxygen evolution. Issue 23 (27th October 2022)

• Record Type: Journal Article
• Authors: Sood, Parul; Joshi, Arti; Singh, Monika
• Is Part Of: Nanoscale advances. Volume 4:Issue 23(2022)
• Page Start: 5015
• Page End: 5020
• Publication Date: 2022-10-27
• Subjects: 620.5
• DOI: 10.1039/d2na00646d
• Languages: English
• ISSNs: 2516-0230

Abstract

Abstract : A rare POM cluster [NiW12 O44 ] 14− based solid was explored for OER. It acts as an efficient and highly sustained pre-catalyst in alkaline medium with an overpotential of 347 mV to achieve a current density of 10 mA cm −2 and stability up to 96 h. Abstract : Polyoxometalates (POMs) are an eminent class of metal oxide anionic clusters of early transition metals with huge structural diversity. Herein, a [NiW12 O44 ] 14− cluster based solid, (C5 H7 N2 )6 [NiW12 O44 ], has been reported (PS-78). The [NiW12 O44 ] 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 WO x ( 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.