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Large-Pore Sized Polyhedral Carbon Nanofoams as Counter Electrodes for Dye-Sensitized Solar Cells
KTH, School of Chemical Science and Engineering (CHE), Chemistry, Inorganic Chemistry.
Physical Chemistry, Department of Physical and Analytical Chemistry, Uppsala University.
Institute for Surface Chemistry.
KTH, School of Chemical Science and Engineering (CHE), Chemistry, Inorganic Chemistry.
(English)Manuscript (preprint) (Other academic)
Abstract [en]

Polyhedral carbon nanofoams (PNF-C) of large mesoporous pore sizes were prepared using a hard-templating method and then investigated as low-temperature counterel ectrode materials in dye-sensitized solar cell (DSC). Photovoltaic parameters comprising short-circuit current (ISC), open-circuit voltage (VOC), fill factor (FF) and an overall light-to-electron conversion efficiency were evaluated for the fabricated cells. The superior structural features of the carbon foam materials; including large hollow mesoporous cells, large surface area and interconnected 3D framework; allow fast mass transport and enhanced activity toward I3- reduction as compared to microporous carbon counter electrode, used as a reference. Electrochemical Impedance Spectroscopy (EIS) analysis revealed decreased charge transfer resistance at the PNF-C counter electrode/electrolyte surface, thus improved energy conversion efficiency of 3.0 % in comparison with the standard carbon electrode of 1.3 %.

Identifiers
URN: urn:nbn:se:kth:diva-27156OAI: oai:DiVA.org:kth-27156DiVA: diva2:375079
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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