Performance Comparison of Protonic and Sodium Phosphomolybdovanadate Polyoxoanion Catholytes Within a Chemically Regenerative Redox Cathode Polymer Electrolyte Fuel Cell

Hdl Handle:
http://hdl.handle.net/10034/620745
Title:
Performance Comparison of Protonic and Sodium Phosphomolybdovanadate Polyoxoanion Catholytes Within a Chemically Regenerative Redox Cathode Polymer Electrolyte Fuel Cell
Authors:
Ward, David B.; Gunn, Natasha L.O.; Uwigena, Nadine; Davies, Trevor J.
Abstract:
The direct reduction of oxygen in conventional polymer electrolyte fuel cells (PEFCs) is seen by many researchers as a key challenge in PEFC development. Chemically regenerative redox cathode (CRRC) polymer electrolyte fuel cells offer an alternative approach via the indirect reduction of oxygen, improving durability and reducing cost. These systems substitute gaseous oxygen for a liquid catalyst that is reduced at the cathode then oxidised in a regeneration vessel via air bubbling. A key component of a CRRC system is the liquid catalyst or catholyte. To date, phosphomolybdovanadium polyoxometalates with empirical formula H3+nPVnMo12-nO40 have shown the most promise for CRRC PEFC systems. In this work, four catholyte formulations are studied and compared against each other. The catholytes vary in vanadium content, pH and counter ion, with empirical formulas H6PV3Mo9O40, H7PV4Mo8O40, Na3H3PV3Mo9O40 and Na4H3PV4Mo8O40. Thermodynamic properties, cell performance and regeneration rates are measured, generating new insights into how formulation chemistry affects the components of a CRRC system. The results include the best CRRC PEFC performance reported to date, with noticeable advantages over conventional PEFCs. The optimum catholyte formulation is then determined via steady state tests, the results of which will guide further optimization of the catholyte formulation.
Affiliation:
University of Chester
Citation:
Ward, D. B., Gunn, N. L. O., Uwigena, N. & and Davies, T. J. (2017). Performance Comparison of Protonic and Sodium Phosphomolybdovanadate Polyoxoanion Catholytes Within a Chemically Regenerative Redox Cathode Polymer Electrolyte Fuel Cell. Journal of Power Sources, 375, 68-76.
Publisher:
Elsevier
Journal:
Journal of Power Sources
Publication Date:
23-Nov-2017
URI:
http://hdl.handle.net/10034/620745
DOI:
10.1016/j.jpowsour.2017.11.035
Additional Links:
https://www.sciencedirect.com/science/article/pii/S0378775317314945
Type:
Article
Language:
en
ISSN:
0378-7753
Appears in Collections:
Natural Sciences

Full metadata record

DC FieldValue Language
dc.contributor.authorWard, David B.en
dc.contributor.authorGunn, Natasha L.O.en
dc.contributor.authorUwigena, Nadineen
dc.contributor.authorDavies, Trevor J.en
dc.date.accessioned2017-12-07T10:47:12Z-
dc.date.available2017-12-07T10:47:12Z-
dc.date.issued2017-11-23-
dc.identifier.citationWard, D. B., Gunn, N. L. O., Uwigena, N. & and Davies, T. J. (2017). Performance Comparison of Protonic and Sodium Phosphomolybdovanadate Polyoxoanion Catholytes Within a Chemically Regenerative Redox Cathode Polymer Electrolyte Fuel Cell. Journal of Power Sources, 375, 68-76.en
dc.identifier.issn0378-7753-
dc.identifier.doi10.1016/j.jpowsour.2017.11.035-
dc.identifier.urihttp://hdl.handle.net/10034/620745-
dc.description.abstractThe direct reduction of oxygen in conventional polymer electrolyte fuel cells (PEFCs) is seen by many researchers as a key challenge in PEFC development. Chemically regenerative redox cathode (CRRC) polymer electrolyte fuel cells offer an alternative approach via the indirect reduction of oxygen, improving durability and reducing cost. These systems substitute gaseous oxygen for a liquid catalyst that is reduced at the cathode then oxidised in a regeneration vessel via air bubbling. A key component of a CRRC system is the liquid catalyst or catholyte. To date, phosphomolybdovanadium polyoxometalates with empirical formula H3+nPVnMo12-nO40 have shown the most promise for CRRC PEFC systems. In this work, four catholyte formulations are studied and compared against each other. The catholytes vary in vanadium content, pH and counter ion, with empirical formulas H6PV3Mo9O40, H7PV4Mo8O40, Na3H3PV3Mo9O40 and Na4H3PV4Mo8O40. Thermodynamic properties, cell performance and regeneration rates are measured, generating new insights into how formulation chemistry affects the components of a CRRC system. The results include the best CRRC PEFC performance reported to date, with noticeable advantages over conventional PEFCs. The optimum catholyte formulation is then determined via steady state tests, the results of which will guide further optimization of the catholyte formulation.en
dc.language.isoenen
dc.publisherElsevieren
dc.relation.urlhttps://www.sciencedirect.com/science/article/pii/S0378775317314945en
dc.rights.urihttp://creativecommons.org/licenses/by-nc-nd/4.0/en
dc.subjectPolymer electrolyte fuel cellsen
dc.titlePerformance Comparison of Protonic and Sodium Phosphomolybdovanadate Polyoxoanion Catholytes Within a Chemically Regenerative Redox Cathode Polymer Electrolyte Fuel Cellen
dc.typeArticleen
dc.contributor.departmentUniversity of Chesteren
dc.identifier.journalJournal of Power Sourcesen
dc.date.accepted2017-11-09-
or.grant.openaccessYesen
rioxxterms.funderHEIFen
rioxxterms.identifier.projectHEIF KT fundingen
rioxxterms.versionAMen
rioxxterms.licenseref.startdate2019-11-23-
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