Issue 35, 2024

Deciphering the work function induced local charge regulation towards activating an octamolybdate cluster-based solid for acidic water oxidation

Abstract

The advancement of highly robust and efficient electrocatalysts for the oxygen evolution reaction (OER) under acidic conditions is imperative for the sustainable production of green hydrogen. In accomplishing sustainable and sturdy electrocatalysts for oxygen evolution at low pH, the challenge is tough for non-iridium/ruthenium-based electrocatalysts. This study elaborates on the intrinsic alterations in electronic arrangements and structural disorder upon the precise activation of an octamolybdate cluster-based solid [{Cu(pz)4}2Mo8O26]·2H2O through room temperature grinding with rGO (reduced graphene oxide), resulting in enhanced conductivity, stability, and activity of the electrocatalyst towards the acidic OER without employing any benchmark metal ion (Ru or Ir). Additionally, the work function of the composites was found to be low compared to that of pristine polyoxometalates (POMs), indicative of the improved conducive behavior, which is lacking in the POM structure. The catalyst displays a notably reduced overpotential of 185 mV to achieve a current density of 10 mA cm−2, coupled with significant stability lasting 24 hours at a higher current density of 100 mA cm−2. These findings propose the manipulation of crystalline POMs with highly conductive non-metallic elements to facilitate superior water oxidation at lower pH levels which can help in the production of green hydrogen.

Graphical abstract: Deciphering the work function induced local charge regulation towards activating an octamolybdate cluster-based solid for acidic water oxidation

Supplementary files

Article information

Article type
Communication
Submitted
26 Jun 2024
Accepted
13 Aug 2024
First published
13 Aug 2024

Nanoscale, 2024,16, 16420-16429

Deciphering the work function induced local charge regulation towards activating an octamolybdate cluster-based solid for acidic water oxidation

H. Bagdwal, P. Sood, A. K. Dhillon, A. Singh and M. Singh, Nanoscale, 2024, 16, 16420 DOI: 10.1039/D4NR02645D

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