{Mo132}-type giant polyoxometalates as electrocatalysts for the hydrogen evolution reaction.

Authors

Lakshmi Priya, Gopika Premanand, Partha Mondal, Samar K Das

Published in

Dalton transactions (Cambridge, England : 2003). Nov 12, 2026. Epub Nov 12, 2026.

Abstract

The pressing issues of the exponential growth of the global population and increasing industrialization have led to an unprecedented rise in energy demand, worsening the ongoing energy crisis and environmental concerns associated with fossil fuel consumption. On that account, the development of efficient electrocatalysts for the hydrogen evolution reaction (HER) has emerged as an important research focus for sustainable and clean hydrogen production. This work addresses this issue by reporting an ambient temperature cation exchange reaction of {Mo132} polyoxometalate (POM), leading to the development of three heterogeneous electrocatalysts (LaMo132, EuMo132, and SmMo132) for the HER under mildly acidic conditions. Various spectroscopic, microscopic, and elemental analyses were employed to characterize these compounds. Cation exchange by lanthanide cations (La³⁺, Eu³⁺, and Sm³⁺) rendered {Mo132} water insoluble, thereby enabling the transition from homogeneous to heterogeneous electrocatalysis. The best electrocatalyst, SmMo132, exhibits a Tafel slope of 139 mV per decade with an overpotential of 411 ± 11 mV at 10 mA cm^-2.

PMID:
43018288
Bibliographic data and abstract were imported from PubMed on 12 Nov 2026.

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