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Polyhedral Carbon Nanofoams as Working Electrodes in PEM Fuel Cells
KTH, School of Chemical Science and Engineering (CHE), Chemistry, Inorganic Chemistry.
Institute for Surface Chemistry.
KTH, School of Chemical Science and Engineering (CHE), Chemistry, Inorganic Chemistry.
(English)Manuscript (preprint) (Other (popular science, discussion, etc.))
Abstract [en]

Polyhedral carbon nanofoams (PNF-C´s) of various pore sizes were prepared and tested as working electrode support materials with relatively low Pt loading in Polymer Electrolyte Membrane Fuell Cell (PEMFs). The electrochemically active surface area (ECSA), carbon double layer capacitance (DLC), as well as fuel performance were evaluated by Cyclic Voltammetry (CV), Polarization Curves (PC) and Electrochemica lImpedance Spectroscopy (EIS) and compared to that of commercial working electrode material. The 3D interconnected, highly porous open structure, good electrical conductivity and unique surface characteristics of PNF-C´s offer increased mass transport and access to catalytic sites in fuel cells. One of the PNF-C supported Pt catalysts studied here out performed the standard commercial Pt/Vulcan catalyst due to its lower ionomer resistance and increased mass transport character.

National Category
Inorganic Chemistry
Identifiers
URN: urn:nbn:se:kth:diva-27157OAI: oai:DiVA.org:kth-27157DiVA: diva2:375089
Note
QC 20101207Available from: 2010-12-07 Created: 2010-12-07 Last updated: 2010-12-08Bibliographically approved
In thesis
1. Synthesis, Characterization and Application of Multiscale Porous Materials
Open this publication in new window or tab >>Synthesis, Characterization and Application of Multiscale Porous Materials
2010 (English)Doctoral thesis, comprehensive summary (Other academic)
Abstract [en]

This thesis work brings fresh insights and improved understanding of nanoscale materials through introducing new hybrid composites, 2D hexagonal in MCM-41 and 3D random interconnected structures of different materials, and application relevance for developing fields of science, such as fuel cells and solar cells.New types of porous materials and organometallic crystals have been prepared and characterized in detail. The porous materials have been used in several studies: as hosts to encapsulate metal-organic complexes; as catalyst supports and electrode materials in devices for alternative energy production. The utility of the new porous materials arises from their unique structural and surface chemical characteristics as demonstrated here using various experimental and theoretical approaches.New single crystal structures and arene-ligand exchange properties of f-block elements coordinated to ligand arene and halogallates are described in Paper I. These compounds have been incorporated into ordered 2D-hexagonal MCM-41 and polyhedral silica nanofoam (PNF-SiO2) matrices without significant change to the original porous architectures as described in Paper II and III. The resulting inorganic/organic hybrids exhibited enhanced luminescence activity relative to the pure crystalline complexes.A series of novel polyhedral carbon nanofoams (PNF-C´s) and inverse foams were prepared by nanocasting from PNF-SiO2’s. These are discussed in Paper IV. The synthesis conditions of PNF-C’s were systematically varied as a function of the filling ratio of carbon precursor and their structures compared using various characterization methods. The carbonaceous porous materials were further tested in Paper V and VI as possible catalysts and catalyst supports in counter- and working electrodes for solar- and fuel cell applications.

Place, publisher, year, edition, pages
Stockholm: KTH, 2010. 58 p.
Series
Trita-CHE-Report, ISSN 1654-1081 ; 2010:3
National Category
Inorganic Chemistry
Identifiers
urn:nbn:se:kth:diva-27158 (URN)978-91-7415-830-4 (ISBN)
Public defence
2010-12-14, D3, Lindstedtsvägen 5, entréplan, KTH, Stockholm, 10:00 (English)
Opponent
Supervisors
Note
QC 20101207Available from: 2010-12-07 Created: 2010-12-07 Last updated: 2010-12-08Bibliographically approved

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