Magnetoelectrocatalysis: Evidence from the Hydrogen Evolution Reaction

Krysti L. Knoche Gupta; Heung Chan Lee; Johna Leddy

doi:10.1021/acsphyschemau.3c00039

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Magnetoelectrocatalysis: Evidence from the Hydrogen Evolution Reaction

Journal article

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Magnetoelectrocatalysis: Evidence from the Hydrogen Evolution Reaction

Krysti L. Knoche Gupta, Heung Chan Lee and Johna Leddy

ACS Physical Chemistry Au, Vol.4(2), pp.148-159

03/27/2024

DOI: 10.1021/acsphyschemau.3c00039

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Abstract

Hydrogen evolution reaction (HER) rates are higher where magnetic gradients are established at electrode surfaces. In comparison of literature data for metals with comparable work functions, we note 1000× higher rates for paramagnetic metals than diamagnetic metals. With unpaired electron spins, paramagnetic and ferromagnetic metals establish interfacial magnetic gradients. At diamagnetic electrodes, gradients are induced by addition of magnetized microparticles. Onset of hydrogen evolution for magnetized γ-Fe2O3 microparticles in Nafion on diamagnetic glassy carbon electrodes is lower by 190 mV (−18 kJ mol–1) relative to demagnetized microparticles. Chemically the same as demagnetized particles, the physical distinction of magnetic field and gradient at magnetized microparticles increases electron transfer rate. For magnetized Fe3O4 microparticles, the onset is lower by 280 mV (−27 kJ mol–1). Paramagnetic platinum electrodes are unaffected by addition of magnetized microparticles. Magnetoelectrocatalysis is established by magnetic gradients.

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Details

Title: Subtitle: Magnetoelectrocatalysis: Evidence from the Hydrogen Evolution Reaction
Creators: Krysti L. Knoche Gupta - Department of Chemistry, University of Iowa, Iowa City, Iowa 52240, United States
Heung Chan Lee - University of Iowa
Johna Leddy - University of Iowa
Resource Type: Journal article
Publication Details: ACS Physical Chemistry Au, Vol.4(2), pp.148-159
DOI: 10.1021/acsphyschemau.3c00039
ISSN: 2694-2445
eISSN: 2694-2445
Publisher: American Chemical Society
Grant note: DOI: 10.13039/100000165, name: Division of Chemistry, award: CHE-0809745, CHE-1309366; DOI: 10.13039/100000183, name: Army Research Office, award: W911NF-19-1-0208
Language: English
Electronic publication date: 01/03/2024
Date published: 03/27/2024
Academic Unit: Chemistry
Record Identifier: 9984544953602771

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