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Mechanisms of interfacial electron-transfer within high-surface-area metal-oxide thin films.

Record Type:	Language materials, manuscript : Monograph/item
Title/Author:	Mechanisms of interfacial electron-transfer within high-surface-area metal-oxide thin films./
Author:	Rowley, John G.
Description:	1 online resource (133 pages)
Notes:	Source: Dissertation Abstracts International, Volume: 73-01, Section: B, page: 3170.
Contained By:	Dissertation Abstracts International73-01B.
Subject:	Inorganic chemistry. -
Online resource:	click for full text (PQDT)
ISBN:	9781124992471

Mechanisms of interfacial electron-transfer within high-surface-area metal-oxide thin films.
Rowley, John G.

Mechanisms of interfacial electron-transfer within high-surface-area metal-oxide thin films. - 1 online resource (133 pages)

Source: Dissertation Abstracts International, Volume: 73-01, Section: B, page: 3170.

Thesis (Ph.D.)

Includes bibliographical references

The direct conversion of solar photon energy into electrical power is achieved with photovoltaic technology, yet existing technology is too inefficient or expensive to implement on a global scale. Dye sensitized solar cells (DSSCs) based on earth abundant low cost materials could overcome the barriers for world-wide implantation of photovoltaic technology. Historically the most efficient regenerative DSSCs utilize iodide based redox mediators in nitrile solvents. Despite the dominance of iodide redox mediator in DSSCs, the chemical attribute(s) that make iodide based electrolytes superior to other electrolyte is yet unproven. Discovering the chemical cause of iodide's superiority as a redox mediator was and important aspect of this thesis research.

Electronic reproduction.
Ann Arbor, Mich. :
ProQuest,
2018

Mode of access: World Wide Web

ISBN: 9781124992471Subjects--Topical Terms:

1182077
Inorganic chemistry.
Index Terms--Genre/Form:

554714
Electronic books.

Mechanisms of interfacial electron-transfer within high-surface-area metal-oxide thin films.
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100 1 $a Rowley, John G. $3 1182075
245 1 0 $a Mechanisms of interfacial electron-transfer within high-surface-area metal-oxide thin films.
264 0 $c 2011
300 $a 1 online resource (133 pages)
336 $a text $b txt $2 rdacontent
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500 $a Source: Dissertation Abstracts International, Volume: 73-01, Section: B, page: 3170.
500 $a Adviser: Gerald J. Meyer.
502 $a Thesis (Ph.D.) $c The Johns Hopkins University $d 2011.
504 $a Includes bibliographical references
520 $a The direct conversion of solar photon energy into electrical power is achieved with photovoltaic technology, yet existing technology is too inefficient or expensive to implement on a global scale. Dye sensitized solar cells (DSSCs) based on earth abundant low cost materials could overcome the barriers for world-wide implantation of photovoltaic technology. Historically the most efficient regenerative DSSCs utilize iodide based redox mediators in nitrile solvents. Despite the dominance of iodide redox mediator in DSSCs, the chemical attribute(s) that make iodide based electrolytes superior to other electrolyte is yet unproven. Discovering the chemical cause of iodide's superiority as a redox mediator was and important aspect of this thesis research.
520 $a In Chapter 2 the photoinitated formation and cleavage of I-I bonds is demonstrated at an un-sensitized potentiostatically controlled mesoporous nanocrystalline (anatase) TiO2 thin film. After pulsed laser excitation of a TiO2 thin film, I2·- was observed that disproportionated to yield I3- and I-, but did not react with TiO2. In contrast evidence for a quasi-Fermi level dependent reaction between TiO2(e -) and I3- was observed.
520 $a In agreement with the findings at un-sensitized TiO2 in Chapter 2, the results presented in Chapter 3 demonstrate that after pulsed laser excitation of an operational DSSC: I2·- is observed, I2·-does not react with TiO 2, and that charge recombination between I3- and TiO2(e-) is operative. In addition to absorption changes attributed to iodide redox chemistry, evidence for a transient electric field induced Stark effect was observed in the operational DSSC. Absorption changes reporting on the electric field at the TiO2 surface were simultaneously quantified at specific power conditions fo the operational DSSC.
520 $a Chapter 4 explores alternative redox mediators to the iodide/triiodide couple. The photophysical studies presented herein provide key mechanistic details on kinetic processes pertinent to operational DSSCs. Specifically, electron transfer to and from iodide species found in an operational DSSC were quantified. Taken together this research advances the body of knowledge quantifying the chemical properties that make iodide based electrolytes a superior redox mediator in dye sensitized solar cells.
533 $a Electronic reproduction. $b Ann Arbor, Mich. : $c ProQuest, $d 2018
538 $a Mode of access: World Wide Web
650 4 $a Inorganic chemistry. $3 1182077
650 4 $a Materials science. $3 557839
655 7 $a Electronic books. $2 local $3 554714
690 $a 0488
690 $a 0794
710 2 $a ProQuest Information and Learning Co. $3 1178819
710 2 $a The Johns Hopkins University. $3 1182076
773 0 $t Dissertation Abstracts International $g 73-01B.
856 4 0 $u http://pqdd.sinica.edu.tw/twdaoapp/servlet/advanced?query=3483372 $z click for full text (PQDT)