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Synthesis and characterization of me...

Cheng, Wei.

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Synthesis and characterization of mesoporous materials.

Record Type:	Electronic resources : Monograph/item
Title/Author:	Synthesis and characterization of mesoporous materials./
Author:	Cheng, Wei.
Description:	118 p.
Notes:	Source: Dissertation Abstracts International, Volume: 63-01, Section: B, page: 0465.
Contained By:	Dissertation Abstracts International63-01B.
Subject:	Engineering, Materials Science. -
Online resource:	http://pqdd.sinica.edu.tw/twdaoapp/servlet/advanced?query=3040192
ISBN:	9780493535647

Synthesis and characterization of mesoporous materials.
Cheng, Wei.

Synthesis and characterization of mesoporous materials. - 118 p.

Source: Dissertation Abstracts International, Volume: 63-01, Section: B, page: 0465.

Thesis (Ph.D.)--University of California, Los Angeles, 2002.

Mesoporous materials are highly porous solids with pore sizes in the range of 20 to 500 A and a narrow pore size distribution. Creating a mesoporous morphology in transition metal oxides is expected to increase the kinetics of electrochemical photoelectrochemical processes due to the improved accessibility of electrolyte to electrode. The objective of the dissertation research is to prepare functional mesoporous materials based on transition metal oxides and to determine the effects of the mesoporous structure on the resulting charge transfer, electrochromism, and optical properties.

ISBN: 9780493535647Subjects--Topical Terms:

1017759
Engineering, Materials Science.

Synthesis and characterization of mesoporous materials.
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245 1 0 $a Synthesis and characterization of mesoporous materials.
300 $a 118 p.
500 $a Source: Dissertation Abstracts International, Volume: 63-01, Section: B, page: 0465.
500 $a Chair: Bruce S. Dunn.
502 $a Thesis (Ph.D.)--University of California, Los Angeles, 2002.
520 $a Mesoporous materials are highly porous solids with pore sizes in the range of 20 to 500 A and a narrow pore size distribution. Creating a mesoporous morphology in transition metal oxides is expected to increase the kinetics of electrochemical photoelectrochemical processes due to the improved accessibility of electrolyte to electrode. The objective of the dissertation research is to prepare functional mesoporous materials based on transition metal oxides and to determine the effects of the mesoporous structure on the resulting charge transfer, electrochromism, and optical properties.
520 $a In this dissertation, mesoporous tungsten oxide and niobium oxide were synthesized by incorporating tri-block copolymer surfactant templates into the sol-gel synthesis procedure. Both mesoporous materials have surface areas in the range of 130 m2/g with a narrow pore size distribution centered at &sim;45A. Their electrochromic properties were characterized and found to be strongly influenced by the mesoporous morphology. Both mesoporous systems exhibit better electrochemical and optical reversibilities than the analogous sol-gel materials (without using surfactant) and the kinetics of bleaching is substantially faster. Coloration efficiencies for the mesoporous tungsten oxide and niobium oxide films are in the range of 16--37 cm 2/C and 12--16 cm2/C, respectively.
520 $a Dye sensitized solar cells (DSSC) were fabricated using mesoporous niobium oxide as electrodes. Due to the higher surface area, the mesoporous electrodes have greater dye adsorption and electrolyte penetration compared to sol-gel electrodes, which leads to better electron injection, faster dye regeneration and thus, better cell performance. The mesoporous DSSC exhibits photocurrents of 2.9 mA and fill factors of 0.61. Open circuit voltages of the mesoporous DSSC are in the range of 0.6--0.83V.
590 $a School code: 0031.
650 4 $a Engineering, Materials Science. $3 1017759
650 4 $a Energy. $3 876794
690 $a 0794
690 $a 0791
710 2 0 $a University of California, Los Angeles. $3 626622
773 0 $t Dissertation Abstracts International $g 63-01B.
790 1 0 $a Dunn, Bruce S., $e advisor
790 $a 0031
791 $a Ph.D.
792 $a 2002
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