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Evaluation of Fluorine and Sulfonic Acid Co-functionalized Graphene Oxide Membranes in Hydrogen Proton Exchange Membrane Fuel Cell Conditions
Umeå universitet, Teknisk-naturvetenskapliga fakulteten, Institutionen för fysik.ORCID-id: 0000-0002-6830-2174
Umeå universitet, Teknisk-naturvetenskapliga fakulteten, Institutionen för fysik.ORCID-id: 0000-0002-5210-2645
Umeå universitet, Teknisk-naturvetenskapliga fakulteten, Institutionen för fysik.
Umeå universitet, Teknisk-naturvetenskapliga fakulteten, Institutionen för fysik.
Vise andre og tillknytning
2019 (engelsk)Inngår i: Sustainable Energy & Fuels, ISSN 2398-4902, Vol. 3, nr 7, s. 1790-1798Artikkel i tidsskrift (Fagfellevurdert) Published
Abstract [en]

The use of graphene oxide (GO) based membranes consisting of self-assembled flakes with a lamellar structure represents an intriguing strategy to spatially separate reactants while facilitating proton transport in proton exchange membranes (PEM). Here we chemically modify GO to evaluate the role of fluorine and sulfonic acid groups on the performance of H2/O2 based PEM fuel cells. Mild fluorination is achieved by the presence of hydrogen fluoride during oxidation and subsequent sulfonation resulted in fluorine and SO3- co-functionalized GO. Membrane electrode assembly performance in low temperature and moderate humidity conditions suggested that both functional groups contribute to reduced H2 crossover compared to appropriate reference membranes. Moreover, fluorine groups promoted an enhanced hydrolytic stability while contributing to prevent structural degradation after constant potential experiments whereas sulfonic acid demonstrated a stabilizing effect by preserving proton conductivity.

sted, utgiver, år, opplag, sider
Royal Society of Medicine Press, 2019. Vol. 3, nr 7, s. 1790-1798
Emneord [en]
Proton exchange membrane, Fuel Cell, Graphene oxide, Hydrogen, Fluorine, Sulfonic acid
HSV kategori
Forskningsprogram
nanomaterial
Identifikatorer
URN: urn:nbn:se:umu:diva-158496DOI: 10.1039/C9SE00126CISI: 000472980200014OAI: oai:DiVA.org:umu-158496DiVA, id: diva2:1307784
Forskningsfinansiär
Swedish Research Council, 2017-04862Swedish Energy Agency, 45419-1ÅForsk (Ångpanneföreningen's Foundation for Research and Development), 15-483Interreg Nord
Merknad

Originally included in thesis in manuscript form

Tilgjengelig fra: 2019-04-29 Laget: 2019-04-29 Sist oppdatert: 2019-08-05bibliografisk kontrollert
Inngår i avhandling
1. Innovations in nanomaterials for proton exchange membrane fuel cells
Åpne denne publikasjonen i ny fane eller vindu >>Innovations in nanomaterials for proton exchange membrane fuel cells
2019 (engelsk)Doktoravhandling, med artikler (Annet vitenskapelig)
Alternativ tittel[sv]
Utveckling av nanomaterial för polymerelektrolytbränsleceller
Abstract [en]

Hydrogen technologies are rapidly receiving increased attention as it offers a renewable energy alternative to the current petroleum-based fuel infrastructure, considering that continued large-scale use of such fossil fuels will lead to disastrous impacts on our environment. The proton exchange membrane fuel cell should play a significant role in a hydrogen economy since it enables convenient and direct conversion of hydrogen into electricity, thus allowing the use of hydrogen in applications particularly suited for the transportation industry. To fully realize this, multiple engineering challenges as well as development of advanced nanomaterials must however be addressed.

In this thesis, we present discoveries of new innovative nanomaterials for proton exchange membrane fuel cells by targeting the entire membrane electrode assembly. Conceptually, we first propose new fabrication techniques of gas diffusion electrodes based on helical carbon nanofibers, where an enhanced three-phase boundary was noted in particular for hierarchical structures. The cathode catalyst, responsible for facilitating the sluggish oxygen reduction reaction, was further improved by the synthesis of platinum-based nanoparticles with an incorporated secondary metal (iron, yttrium and cobalt). Here, both solvothermal and high-temperature microwave syntheses were employed. Catalytic activities were improved compared to pure platinum and could be attributed to favorably shifted oxygen adsorption energies as a result of successful incorporation of the non-precious metal. As best exemplified by platinum-iron nanoparticles, the oxygen reduction reaction was highly sensitive to both metal composition and the type of crystal structure. Finally, a proton exchange membrane based on fluorine and sulfonic acid functionalized graphene oxide was prepared and tested in hydrogen fuel cell conditions, showing improvements such as lowered hydrogen permeation and better structural stability. Consequently, we have demonstrated that there is room for improvement of multiple components, suggesting that more powerful fuel cells can likely be anticipated in the future.

sted, utgiver, år, opplag, sider
Umeå: Umeå University, 2019. s. 88
Emneord
Fuel Cells, Membrane Electrode Assembly, Oxygen Reduction Reaction, Platinum alloy catalyst, Nanoparticles, Gas Diffusion Electrode, Proton Exchange Membrane
HSV kategori
Forskningsprogram
materialvetenskap; fasta tillståndets fysik
Identifikatorer
urn:nbn:se:umu:diva-158501 (URN)978-91-7855-044-9 (ISBN)
Disputas
2019-05-28, N460, Naturvetarhuset, Umeå, 10:15 (engelsk)
Opponent
Veileder
Tilgjengelig fra: 2019-05-07 Laget: 2019-04-29 Sist oppdatert: 2019-05-06bibliografisk kontrollert

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