A manganese complex on a gas diffusion electrode for selective CO₂ to CO reduction

Eagle, Catherine, Neri, Gaia, Piercy, Verity L, Younis, Khadija, Siritanaratkul, Bhavin ORCID: 0000-0003-0604-7670 and Cowan, Alexander J ORCID: 0000-0001-9032-3548 (2023) A manganese complex on a gas diffusion electrode for selective CO₂ to CO reduction SUSTAINABLE ENERGY & FUELS, 7 (9). pp. 2301-2307. ISSN 2398-4902, 2398-4902

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Abstract

Manganese carbonyl complexes have been studied extensively in solution as low cost, selective electrocatalysts with a low overpotential for CO<inf>2</inf> reduction but experiments are typically at low current densities. In this work, we examined their application in a gas diffusion electrode (GDE) flow cell and achieved partial current densities for CO, j<inf>CO</inf> of ∼14 mA cm⁻² (−0.98 V<inf>RHE</inf>) with a Faradaic efficiency of >50%. Although we did observe a gradual decrease in activity for the [Mn(2,2′-bipyridine)(CO)<inf>3</inf>Br]/MWCNT (Mnbpy) GDE with a near neutral electrolyte over a 5 h experiment, it still achieves a higher initial partial current density for CO at a lower overpotential than a Ag nanoparticle benchmark electrode. Promisingly, initial studies of the Mnbpy GDE in a zero-gap electrolyser using a reverse biased bipolar membrane (BPM) achieved FE for CO of 70% at 50 mA cm⁻², despite the acidic environment induced through directly contacting the membranes cation exchange layer. Overall this study demonstrates the potential of GDEs for CO<inf>2</inf> reduction based on a catalyst using earth abundant elements.

Item Type:	Article
Uncontrolled Keywords:	34 Chemical Sciences, 3406 Physical Chemistry, Bioengineering
Divisions:	Faculty of Science & Engineering > School of Physical Sciences
Depositing User:	Symplectic Admin
Date Deposited:	05 Apr 2023 10:18
Last Modified:	16 Jun 2026 11:22
DOI:	10.1039/d3se00236e
Related Websites:	Author Publisher
URI:	https://livrepository.liverpool.ac.uk/id/eprint/3169469
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