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Nanocrystalline sol-gel Nb{sub 2}O{sub 5} coatings. Preparation, characterisation and application to photovoltaic cell, lithium battery and eletrochromic device

Abstract

Thick and thin films of Nb{sub 2}O{sub 5} have been prepared by the sol-gel process using cheap niobium pentachloride as precursor and a new synthesis route. The microstructure of the films was tailored by adding poly(ethylene glycol) (PEG) and carbon soot into the sol and varying the sintering temperature. The thesis describes the properties of the sols and their influence on the properties of the resulting nanocrystalline Nb{sub 2}O{sub 5} films as electrodes in dye sensitised solar cells, electrochromic devices and rechargeable lithium batteries. A solar light-to-electric conversion efficiency of Ru(II) sensitised Nb{sub 2}O{sub 5} solar cell as high as 7% under 120 W/m{sup 2} illumination was obtained. An equivalent electric circuit of the dye sensitised electrode/electrolyte interface based on the electrochemical impedance spectroscopy was modelled and found to fit all the results. The values obtained for the electric elements from the simulation of the results were found to relate material parameters to the cell performance and their influence on the cell performance are illustrated. The electrochromism and Li{sup +}-charge and discharge of the Nb{sub 2}O{sub 5} films exhibited also good performance. (orig.)
Authors:
Publication Date:
Jul 01, 2002
Product Type:
Thesis/Dissertation
Report Number:
ETDE-DE-1703
Resource Relation:
Other Information: TH: Diss. (Dr.-Ing.)
Subject:
36 MATERIALS SCIENCE; 25 ENERGY STORAGE; 14 SOLAR ENERGY; COATINGS; PHOTOVOLTAIC CELLS; LITHIUM; ELECTRIC BATTERIES; NIOBIUM OXIDES; ELECTROCHROMISM; FILMS; SOL-GEL PROCESS; ELECTRODES; SYNTHESIS; PRECURSOR
OSTI ID:
20949672
Research Organizations:
Universitaet des Saarlandes, Saarbruecken (Germany). Naturwissenschaftlich-Technische Fakultaet 3 - Chemie, Pharmazie und Werkstoffwissenschaften
Country of Origin:
Germany
Language:
English
Other Identifying Numbers:
TRN: DE07GD897
Availability:
Commercial reproduction prohibited; OSTI as DE20949672
Submitting Site:
DE
Size:
176 pages
Announcement Date:
Dec 21, 2007

Citation Formats

Guo, Yeping. Nanocrystalline sol-gel Nb{sub 2}O{sub 5} coatings. Preparation, characterisation and application to photovoltaic cell, lithium battery and eletrochromic device. Germany: N. p., 2002. Web.
Guo, Yeping. Nanocrystalline sol-gel Nb{sub 2}O{sub 5} coatings. Preparation, characterisation and application to photovoltaic cell, lithium battery and eletrochromic device. Germany.
Guo, Yeping. 2002. "Nanocrystalline sol-gel Nb{sub 2}O{sub 5} coatings. Preparation, characterisation and application to photovoltaic cell, lithium battery and eletrochromic device." Germany.
@misc{etde_20949672,
title = {Nanocrystalline sol-gel Nb{sub 2}O{sub 5} coatings. Preparation, characterisation and application to photovoltaic cell, lithium battery and eletrochromic device}
author = {Guo, Yeping}
abstractNote = {Thick and thin films of Nb{sub 2}O{sub 5} have been prepared by the sol-gel process using cheap niobium pentachloride as precursor and a new synthesis route. The microstructure of the films was tailored by adding poly(ethylene glycol) (PEG) and carbon soot into the sol and varying the sintering temperature. The thesis describes the properties of the sols and their influence on the properties of the resulting nanocrystalline Nb{sub 2}O{sub 5} films as electrodes in dye sensitised solar cells, electrochromic devices and rechargeable lithium batteries. A solar light-to-electric conversion efficiency of Ru(II) sensitised Nb{sub 2}O{sub 5} solar cell as high as 7% under 120 W/m{sup 2} illumination was obtained. An equivalent electric circuit of the dye sensitised electrode/electrolyte interface based on the electrochemical impedance spectroscopy was modelled and found to fit all the results. The values obtained for the electric elements from the simulation of the results were found to relate material parameters to the cell performance and their influence on the cell performance are illustrated. The electrochromism and Li{sup +}-charge and discharge of the Nb{sub 2}O{sub 5} films exhibited also good performance. (orig.)}
place = {Germany}
year = {2002}
month = {Jul}
}