Rapid solid-state metathesis reactions for the formation of cobalt–iron monoboride solid-solutions and investigation of their water splitting electrocatalytic activity

Janaka P. Abeysinghe; Edward G. Gillan

doi:10.1039/D3MA00728F

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Rapid solid-state metathesis reactions for the formation of cobalt–iron monoboride solid-solutions and investigation of their water splitting electrocatalytic activity

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Rapid solid-state metathesis reactions for the formation of cobalt–iron monoboride solid-solutions and investigation of their water splitting electrocatalytic activity

Janaka P. Abeysinghe and Edward G. Gillan

Materials advances, Vol.5(2), pp.705-718

01/21/2024

DOI: 10.1039/D3MA00728F

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Abstract

Metal borides have received increased attention as potentially robust water splitting electrocatalysts. Some studies have reported synergistic electrocatalytic effects on hydrogen and/or oxygen evolution reactions (HER/OER) using mixed metal borides. This report describes the single-step, solvent-free, and rapid (few seconds) synthesis of a series of crystalline Co 1− x Fe x B ( x = 0–1) solid solutions in high isolated product yields (>80%) from exothermic, self-propagating solid-state metathesis (SSM) reactions between metal halides and elemental Mg/B reactants. Powder X-ray diffraction shows the Co 1− x Fe x B products are single-phase with crystallite sizes near 60 nm. SEM/EDS and elemental analysis indicate products contain homogeneous Co/Fe distributions and form large micrometer-sized particle aggregates. The electrocatalytic HER with these well-structured crystalline Co 1− x Fe x B materials in 1 M KOH shows increased HER activity at lower applied potentials as cobalt content increases. The OER activity of Co 1− x Fe x B also generally shows improvement with increased cobalt content. Crystalline Co 1− x Fe x B catalysts exhibit good long-term 24 h HER and OER stability in 1 M KOH. Post-electrochemistry Co 1− x Fe x B analyses confirm the retention of product crystallinity after long term electrocatalysis.

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Details

Title: Subtitle: Rapid solid-state metathesis reactions for the formation of cobalt–iron monoboride solid-solutions and investigation of their water splitting electrocatalytic activity
Creators: Janaka P. Abeysinghe - University of Iowa
Edward G. Gillan - University of Iowa, Chemistry
Resource Type: Journal article
Publication Details: Materials advances, Vol.5(2), pp.705-718
DOI: 10.1039/D3MA00728F
ISSN: 2633-5409
eISSN: 2633-5409
Publisher: Royal Society of Chemistry
Grant note: DOI: 10.13039/100000001, name: National Science Foundation, award: 1954676
Language: English
Electronic publication date: 12/15/2023
Date published: 01/21/2024
Academic Unit: Chemistry
Record Identifier: 9984538958602771

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