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A comparison of Pd/C, perovskite, and Ni-Fe hexacyanoferrate bifunctional oxygen catalysts, at different loadings and catalyst layer thicknesses on an oxygen gas diffusion electrode

A comparison of Pd/C, perovskite, and Ni-Fe hexacyanoferrate bifunctional oxygen catalysts, at different loadings and catalyst layer thicknesses on an oxygen gas diffusion electrode
A comparison of Pd/C, perovskite, and Ni-Fe hexacyanoferrate bifunctional oxygen catalysts, at different loadings and catalyst layer thicknesses on an oxygen gas diffusion electrode

Air electrode development is one of the most challenging steps in the design of lightweight and efficient metal-air batteries and fuel cells. The best performing oxygen catalysts often contain precious metals at a high manufacturing cost. In this paper, two low-cost catalysts for the oxygen reduction (ORR) and evolution reactions (OER), based on LSFCO perovskite and Ni-Fe hexacyanoferrate, were compared with a precious metal palladium catalyst on carbon (Pd/C). LSFCO/C showed the best all-round performance as a single bifunctional catalyst but Pd/C had the strongest ORR activity. Ni-Fe hexacyanoferrate is straightforward to manufacture in industrial quantities, and is more active for the OER than palladium and LSFCO perovskite at small loadings < 5 mg cm-2. By mixing a small loading of Pd/C with Ni-Fe hexacyanoferrate, lower overpotentials for both the ORR and OER can be reached, with the difference in potential between the two reactions being only 0.62 V at a current density of 20 mA cm-2. The effect of catalyst loading of each catalyst on the gas-diffusion electrode was studied, and rotating disk voltammetry was used to study the catalytic behavior of the Ni-Fe hexacyanoferrate catalyst.

0013-4651
A1254-A1262
McKerracher, R.D.
f5f9f0e7-a256-4714-b752-e3bb8dab03fc
Figueredo-Rodríguez, H.A.
e49f1681-45b4-4828-a217-9a507bb68791
Avila-Alejo, J.O.
f4e4373f-77cb-42ed-bf50-d51e16bea7d0
Kwasnicki, K.
50f62a7b-93bb-4487-82fd-976d4f217e60
Ponce De León, C.
508a312e-75ff-4bcb-9151-dacc424d755c
Alegre, C.
b57abb63-73ed-42e7-8510-08d73917a9c4
Baglio, V.
5d62998b-2e86-4f02-b0be-f544f0ae6f02
Aricò, A.S.
aab629f8-1ee4-4e27-93a3-b6e4222d9b8d
Walsh, F.C.
309528e7-062e-439b-af40-9309bc91efb2
McKerracher, R.D.
f5f9f0e7-a256-4714-b752-e3bb8dab03fc
Figueredo-Rodríguez, H.A.
e49f1681-45b4-4828-a217-9a507bb68791
Avila-Alejo, J.O.
f4e4373f-77cb-42ed-bf50-d51e16bea7d0
Kwasnicki, K.
50f62a7b-93bb-4487-82fd-976d4f217e60
Ponce De León, C.
508a312e-75ff-4bcb-9151-dacc424d755c
Alegre, C.
b57abb63-73ed-42e7-8510-08d73917a9c4
Baglio, V.
5d62998b-2e86-4f02-b0be-f544f0ae6f02
Aricò, A.S.
aab629f8-1ee4-4e27-93a3-b6e4222d9b8d
Walsh, F.C.
309528e7-062e-439b-af40-9309bc91efb2

McKerracher, R.D., Figueredo-Rodríguez, H.A., Avila-Alejo, J.O., Kwasnicki, K., Ponce De León, C., Alegre, C., Baglio, V., Aricò, A.S. and Walsh, F.C. (2018) A comparison of Pd/C, perovskite, and Ni-Fe hexacyanoferrate bifunctional oxygen catalysts, at different loadings and catalyst layer thicknesses on an oxygen gas diffusion electrode. Journal of the Electrochemical Society, 165 (7), A1254-A1262. (doi:10.1149/2.0321807jes).

Record type: Article

Abstract

Air electrode development is one of the most challenging steps in the design of lightweight and efficient metal-air batteries and fuel cells. The best performing oxygen catalysts often contain precious metals at a high manufacturing cost. In this paper, two low-cost catalysts for the oxygen reduction (ORR) and evolution reactions (OER), based on LSFCO perovskite and Ni-Fe hexacyanoferrate, were compared with a precious metal palladium catalyst on carbon (Pd/C). LSFCO/C showed the best all-round performance as a single bifunctional catalyst but Pd/C had the strongest ORR activity. Ni-Fe hexacyanoferrate is straightforward to manufacture in industrial quantities, and is more active for the OER than palladium and LSFCO perovskite at small loadings < 5 mg cm-2. By mixing a small loading of Pd/C with Ni-Fe hexacyanoferrate, lower overpotentials for both the ORR and OER can be reached, with the difference in potential between the two reactions being only 0.62 V at a current density of 20 mA cm-2. The effect of catalyst loading of each catalyst on the gas-diffusion electrode was studied, and rotating disk voltammetry was used to study the catalytic behavior of the Ni-Fe hexacyanoferrate catalyst.

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More information

Accepted/In Press date: 6 April 2018
e-pub ahead of print date: 28 April 2018

Identifiers

Local EPrints ID: 424814
URI: http://eprints.soton.ac.uk/id/eprint/424814
ISSN: 0013-4651
PURE UUID: 3bb5421c-7ca4-4a58-ba3c-de92417c15f7
ORCID for C. Ponce De León: ORCID iD orcid.org/0000-0002-1907-5913

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Date deposited: 05 Oct 2018 11:47
Last modified: 07 Oct 2020 01:51

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Contributors

Author: H.A. Figueredo-Rodríguez
Author: J.O. Avila-Alejo
Author: K. Kwasnicki
Author: C. Alegre
Author: V. Baglio
Author: A.S. Aricò
Author: F.C. Walsh

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