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High Performance FeNC and Mn-oxide/FeNC Layers for AEMFC Cathodes

Santori PG, Speck F, Cherevko S, Firouzjaie HA, Peng X, Mustain WE, Jaouen F (2020)

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Publication Type: Journal article

Publication year: 2020

Journal

Book Volume: 167

Journal Issue: 13

DOI: 10.1149/1945-7111/abb7e0

Abstract

While the Anion Exchange Membrane Fuel Cell (AEMFC) is gaining interest due to high power performance recently achieved with platinum-group-metal (PGM) catalysts, its implementation will require high-performing PGM-free cathodes. FeNC catalysts have shown high activity and stability for the Oxygen Reduction Reaction (ORR) in alkaline electrolyte; however, the production of hydrogen peroxide during ORR can lead to premature degradation of FeNC and ionomer. In order to minimize the amount of peroxide formed on FeNC,alpha-MnO2,beta-MnO2,delta-MnO(2)and alpha-Mn(2)O(3)were investigated as co-catalysts, with the aim of increasing the apparent activity of FeNC-based cathodes for the hydrogen peroxide reduction reaction (HPRR). The specific activity of alpha-Mn(2)O(3)for the HPRR was distinctly superior to the other Mn-oxides. The four Mn-oxides were mixed with a FeNC catalyst comprising atomically-dispersed FeN(x)sites, showing higher HPRR activity and higher four-electron ORR selectivity than FeNC alone. The stability of alpha-Mn2O3/FeNC was studiedoperandoby on-line inductively-coupled plasma mass spectrometry, to evaluate the potential and time dependent leaching of Mn and Fe. Finally, FeNC and alpha-Mn2O3/FeNC were applied at the cathode of AEMFCs, both achieving similar or higher current density at 0.9 V than a Pt/C commercial cathode, and peak power densities of ca. 1 Wcm(-2).

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How to cite

APA:

Santori, P.G., Speck, F., Cherevko, S., Firouzjaie, H.A., Peng, X., Mustain, W.E., & Jaouen, F. (2020). High Performance FeNC and Mn-oxide/FeNC Layers for AEMFC Cathodes. Journal of The Electrochemical Society, 167(13). https://doi.org/10.1149/1945-7111/abb7e0

MLA:

Santori, Pietro Giovanni, et al. "High Performance FeNC and Mn-oxide/FeNC Layers for AEMFC Cathodes." Journal of The Electrochemical Society 167.13 (2020).

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