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Structural Modifications and Photoel...

Hill, Joshua Ward.

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Structural Modifications and Photoelectrochemical Mapping of Transition Metal Dichalcogenides via Scanning Electrochemical Cell Microscopy.

紀錄類型:	書目-電子資源 : Monograph/item
正題名/作者:	Structural Modifications and Photoelectrochemical Mapping of Transition Metal Dichalcogenides via Scanning Electrochemical Cell Microscopy./
作者:	Hill, Joshua Ward.
出版者:	Ann Arbor : ProQuest Dissertations & Theses, : 2021,
面頁冊數:	140 p.
附註:	Source: Dissertations Abstracts International, Volume: 83-01, Section: B.
Contained By:	Dissertations Abstracts International83-01B.
標題:	Chemistry. -
電子資源:	https://pqdd.sinica.edu.tw/twdaoapp/servlet/advanced?query=28318445
ISBN:	9798516915222

Structural Modifications and Photoelectrochemical Mapping of Transition Metal Dichalcogenides via Scanning Electrochemical Cell Microscopy.
Hill, Joshua Ward.

Structural Modifications and Photoelectrochemical Mapping of Transition Metal Dichalcogenides via Scanning Electrochemical Cell Microscopy. - Ann Arbor : ProQuest Dissertations & Theses, 2021 - 140 p.

Source: Dissertations Abstracts International, Volume: 83-01, Section: B.

Thesis (Ph.D.)--University of Wyoming, 2021.

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

Transition metal dichalcogenides (TMDs) are a class of two-dimensional semiconductor which are attractive for use in photovoltaic and optoelectronic devices due to their unique structure, large absorption coefficients, and photocatalytic behavior. Although TMDs have many applicable uses, structural variations in the material cause the catalytic activity and carrier diffusion to vary since basal planes are known to be poor catalysts for inner sphere reactions like hydrogen evolution, while step edge defects are potent charge carrier recombination centers. In order to elucidate the role structure has on electrochemical reaction rates and charge carrier recombination, a technique known as scanning electrochemical cell microscopy (SECCM) was employed, which allows electrochemical measurements at local nanoscale regions across the sample. Here, SECCM was employed as a multifunctional tool allowing local anodization, co-catalyst electrodeposition and photoelectrochemical measurements at WSe2 nanoflakes, providing structure-function relationships across these materials. These SECCM studies revealed a large anisotropy in the carrier diffusion as well as enhanced charge carrier recombination at step edge defects. Electrochemical measurements at native and engineered defects within the WSe2 basal planes revealed large catalytic enhancements towards inner sphere reactions. These studies together demonstrate that SECCM is a powerful electrochemical technique, which allows for controlled modification and local electrochemical measurements to be completed, providing detailed structure-function relationships at TMD nanoflakes.

ISBN: 9798516915222Subjects--Topical Terms:

516420
Chemistry.
Subjects--Index Terms:

Carrier diffusion

Structural Modifications and Photoelectrochemical Mapping of Transition Metal Dichalcogenides via Scanning Electrochemical Cell Microscopy.
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520 $a Transition metal dichalcogenides (TMDs) are a class of two-dimensional semiconductor which are attractive for use in photovoltaic and optoelectronic devices due to their unique structure, large absorption coefficients, and photocatalytic behavior. Although TMDs have many applicable uses, structural variations in the material cause the catalytic activity and carrier diffusion to vary since basal planes are known to be poor catalysts for inner sphere reactions like hydrogen evolution, while step edge defects are potent charge carrier recombination centers. In order to elucidate the role structure has on electrochemical reaction rates and charge carrier recombination, a technique known as scanning electrochemical cell microscopy (SECCM) was employed, which allows electrochemical measurements at local nanoscale regions across the sample. Here, SECCM was employed as a multifunctional tool allowing local anodization, co-catalyst electrodeposition and photoelectrochemical measurements at WSe2 nanoflakes, providing structure-function relationships across these materials. These SECCM studies revealed a large anisotropy in the carrier diffusion as well as enhanced charge carrier recombination at step edge defects. Electrochemical measurements at native and engineered defects within the WSe2 basal planes revealed large catalytic enhancements towards inner sphere reactions. These studies together demonstrate that SECCM is a powerful electrochemical technique, which allows for controlled modification and local electrochemical measurements to be completed, providing detailed structure-function relationships at TMD nanoflakes.
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653 $a Electrochemistry
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653 $a Scanning Electrochemical Cell Microscopy
653 $a Transition Metal Dichalcogenides
653 $a Photoelectrochemical mapping
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