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Design of Durable and Efficient Cata...

Fang, Dan.

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Design of Durable and Efficient Catalysts for the Electro-Oxidation of Methanol.

紀錄類型:	書目-電子資源 : Monograph/item
正題名/作者:	Design of Durable and Efficient Catalysts for the Electro-Oxidation of Methanol./
作者:	Fang, Dan.
出版者:	Ann Arbor : ProQuest Dissertations & Theses, : 2019,
面頁冊數:	158 p.
附註:	Source: Dissertations Abstracts International, Volume: 81-10, Section: B.
Contained By:	Dissertations Abstracts International81-10B.
標題:	Molecular chemistry. -
電子資源:	https://pqdd.sinica.edu.tw/twdaoapp/servlet/advanced?query=27785569
ISBN:	9781392574539

Design of Durable and Efficient Catalysts for the Electro-Oxidation of Methanol.
Fang, Dan.

Design of Durable and Efficient Catalysts for the Electro-Oxidation of Methanol. - Ann Arbor : ProQuest Dissertations & Theses, 2019 - 158 p.

Source: Dissertations Abstracts International, Volume: 81-10, Section: B.

Thesis (Ph.D.)--University of Southern California, 2019.

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

This work presented in this thesis focuses on designing electrocatalysts for methanol oxidation and understanding the catalytic processes. The goal is to achieve more durable and efficient electrocatalysts for direct methanol fuel cells. Direct methanol oxidation catalysts Pt₁₋ₓ-Mₓ (M = Ta, Nb, Ti, Zr, 0 < x < 1) was prepared using co-sputter deposition. Characterization of these thin film catalysts was performed using scanning electron microscopy (SEM), energy dispersive X-ray (EDX) and X-ray photoelectron spectroscopy (XPS). Assessment of the methanol oxidation activity of Pt₁₋ₓ-Mₓ catalysts were achieved through half-cell experiments. Among all the Pt₁₋ₓ-Mₓ catalysts, Pt₀.₇₇-Ta₀.₂₃ catalyst showed best electrochemical area specific activity which is comparable to platinum ruthenium alloy on carbon (PtRu/C) catalysts. Pt₁₋ₓ-Taₓ, Pt₁₋ₓ-Nbₓ and Pt₁₋ₓ-Zrₓ catalysts work as bifunctional methanol oxidation catalysts. The surface oxides species activates water molecules and hence facilitate the process of removing carbon monoxide from platinum sites. The membrane electrode assembly (MEA) of Pt₀.₇₇-Ta₀.₂₃ catalyst was tested at 60℃, 80℃ and 90℃. The power density achieved at 90℃ was 82 mW/cm²/mg Pt, which is 1.82 times of PtRu/C catalyst with similar platinum loading. This is the first a methanol oxidation catalyst containing tantalum being tested in an MEA.

ISBN: 9781392574539Subjects--Topical Terms:

1071612
Molecular chemistry.
Subjects--Index Terms:

Methanol oxidation

Design of Durable and Efficient Catalysts for the Electro-Oxidation of Methanol.
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520 $a This work presented in this thesis focuses on designing electrocatalysts for methanol oxidation and understanding the catalytic processes. The goal is to achieve more durable and efficient electrocatalysts for direct methanol fuel cells. Direct methanol oxidation catalysts Pt₁₋ₓ-Mₓ (M = Ta, Nb, Ti, Zr, 0 < x < 1) was prepared using co-sputter deposition. Characterization of these thin film catalysts was performed using scanning electron microscopy (SEM), energy dispersive X-ray (EDX) and X-ray photoelectron spectroscopy (XPS). Assessment of the methanol oxidation activity of Pt₁₋ₓ-Mₓ catalysts were achieved through half-cell experiments. Among all the Pt₁₋ₓ-Mₓ catalysts, Pt₀.₇₇-Ta₀.₂₃ catalyst showed best electrochemical area specific activity which is comparable to platinum ruthenium alloy on carbon (PtRu/C) catalysts. Pt₁₋ₓ-Taₓ, Pt₁₋ₓ-Nbₓ and Pt₁₋ₓ-Zrₓ catalysts work as bifunctional methanol oxidation catalysts. The surface oxides species activates water molecules and hence facilitate the process of removing carbon monoxide from platinum sites. The membrane electrode assembly (MEA) of Pt₀.₇₇-Ta₀.₂₃ catalyst was tested at 60℃, 80℃ and 90℃. The power density achieved at 90℃ was 82 mW/cm²/mg Pt, which is 1.82 times of PtRu/C catalyst with similar platinum loading. This is the first a methanol oxidation catalyst containing tantalum being tested in an MEA.
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