Issue 14, 2022

WVI–OH functionality on polyoxometalates for water reduction to molecular hydrogen

Abstract

Grafting a WVI–(OH)2 functionality on the surface of polyoxometalates (POMs) makes the concerned POM compounds, Na6[{CoII(H2O)3}2{WVI(OH)2}2{(BiIIIWVI9O33)2}]·8H2O (1) and Na4(Himi)2[{MnII(H2O)3}2{WVI(OH)2}2{(BiIIIWVI9O33)2}]·28H2O (2) prominent heterogeneous electrocatalysts for water reduction to molecular hydrogen. We have identified that the WVI–(OH)2 functionality acts as the active site for electrocatalytic hydrogen evolution reaction (HER). The chances of in situ generation and participation of secondary species (metal nanoparticles etc.) in the present electrocatalysis have been eliminated by performing controlled experiments. The electrocatalysts 1 and 2 are stable enough towards HER up to 1000 cycles of cyclic voltammetric measurement and 10 hours chronoamperometry. The relevant turnover frequencies of 1 and 2 are 0.593 s−1 and 0.634 s−1 respectively exhibiting high efficiency towards electrocatalytic HER. This work has potential to generalize that POMs having M–OH functionality attached on its cluster surface would function as catalysts for HER.

Graphical abstract: WVI–OH functionality on polyoxometalates for water reduction to molecular hydrogen

Supplementary files

Article information

Article type
Research Article
Submitted
23 Feb 2022
Accepted
26 May 2022
First published
27 May 2022

Inorg. Chem. Front., 2022,9, 3566-3577

WVI–OH functionality on polyoxometalates for water reduction to molecular hydrogen

S. Mulkapuri, A. Ravi, S. Mukhopadhyay, S. K. Kurapati, V. Siby and S. K. Das, Inorg. Chem. Front., 2022, 9, 3566 DOI: 10.1039/D2QI00421F

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