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Nanostructured Tungsten Trioxide Pho...

California Institute of Technology.

Nanostructured Tungsten Trioxide Photoanodes for Solar Energy Conversion.

Record Type:	Electronic resources : Monograph/item
Title/Author:	Nanostructured Tungsten Trioxide Photoanodes for Solar Energy Conversion.
Author:	Wiggenhorn, David Craig.
Description:	121 p.
Notes:	Source: Dissertation Abstracts International, Volume: 75-05(E), Section: B.
Notes:	Adviser: Nathan S. Lewis.
Contained By:	Dissertation Abstracts International75-05B(E).
Subject:	Chemistry.
Online resource:	http://pqdd.sinica.edu.tw/twdaoapp/servlet/advanced?query=3609736
ISBN:	9781303688706

Nanostructured Tungsten Trioxide Photoanodes for Solar Energy Conversion.
Wiggenhorn, David Craig.

Nanostructured Tungsten Trioxide Photoanodes for Solar Energy Conversion. - 121 p.

Source: Dissertation Abstracts International, Volume: 75-05(E), Section: B.

Thesis (Ph.D.)--California Institute of Technology, 2014.

This item must not be sold to any third party vendors.

Nanostructured tungsten trioxide (WO3) photoelectrodes are potential candidates for the anodic portion of an integrated solar water-splitting device that generates hydrogen fuel and oxygen from water. These nanostructured materials can potentially offer improved performance in photooxidation reactions compared to unstructured materials because of enhancements in light scattering, increases in surface area, and their decoupling of the directions of light absorption and carrier collection. To evaluate the presence of these effects and their contributions toward energy conversion efficiency, a variety of nanostructured WO3 photoanodes were synthesized by electrodeposition within nanoporous templates and by anodization of tungsten foils. A robust fabrication process was developed for the creation of oriented WO3 nanorod arrays, which allows for control nanorod diameter and length. Films of nanostructured WO3 platelets were grown via anodization, the morphology of the films was controlled by the anodization conditions, and the current-voltage performance and spectral response properties of these films were studied. The observed photocurrents were consistent with the apparent morphologies of the nanostructured arrays. Measurements of electrochemically active surface area and other physical characteristics were correlated with observed differences in absorbance, external quantum yield, and photocurrent density for the anodized arrays. The capability to quantify these characteristics and relate them to photoanode performance metrics can allow for selection of appropriate structural parameters when designing photoanodes for solar energy conversion.

ISBN: 9781303688706Subjects--Topical Terms:

188628
Chemistry.

Nanostructured Tungsten Trioxide Photoanodes for Solar Energy Conversion.
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245 1 0 $a Nanostructured Tungsten Trioxide Photoanodes for Solar Energy Conversion.
300 $a 121 p.
500 $a Source: Dissertation Abstracts International, Volume: 75-05(E), Section: B.
500 $a Adviser: Nathan S. Lewis.
502 $a Thesis (Ph.D.)--California Institute of Technology, 2014.
506 $a This item must not be sold to any third party vendors.
520 $a Nanostructured tungsten trioxide (WO3) photoelectrodes are potential candidates for the anodic portion of an integrated solar water-splitting device that generates hydrogen fuel and oxygen from water. These nanostructured materials can potentially offer improved performance in photooxidation reactions compared to unstructured materials because of enhancements in light scattering, increases in surface area, and their decoupling of the directions of light absorption and carrier collection. To evaluate the presence of these effects and their contributions toward energy conversion efficiency, a variety of nanostructured WO3 photoanodes were synthesized by electrodeposition within nanoporous templates and by anodization of tungsten foils. A robust fabrication process was developed for the creation of oriented WO3 nanorod arrays, which allows for control nanorod diameter and length. Films of nanostructured WO3 platelets were grown via anodization, the morphology of the films was controlled by the anodization conditions, and the current-voltage performance and spectral response properties of these films were studied. The observed photocurrents were consistent with the apparent morphologies of the nanostructured arrays. Measurements of electrochemically active surface area and other physical characteristics were correlated with observed differences in absorbance, external quantum yield, and photocurrent density for the anodized arrays. The capability to quantify these characteristics and relate them to photoanode performance metrics can allow for selection of appropriate structural parameters when designing photoanodes for solar energy conversion.
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