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Development of cathodic electrocatalysts for low temperature H2 fuel cell applications : = Improving oxygen reduction activity through the manipulation of size, shape, and composition.

紀錄類型:	書目-語言資料,手稿 : Monograph/item
正題名/作者:	Development of cathodic electrocatalysts for low temperature H2 fuel cell applications :/
其他題名:	Improving oxygen reduction activity through the manipulation of size, shape, and composition.
作者:	Van Cleve, Timothy Blair.
面頁冊數:	1 online resource (147 pages)
附註:	Source: Dissertation Abstracts International, Volume: 78-01(E), Section: B.
Contained By:	Dissertation Abstracts International78-01B(E).
標題:	Chemical engineering. -
電子資源:	click for full text (PQDT)
ISBN:	9781369082272

Development of cathodic electrocatalysts for low temperature H2 fuel cell applications : = Improving oxygen reduction activity through the manipulation of size, shape, and composition.
Van Cleve, Timothy Blair.

Development of cathodic electrocatalysts for low temperature H2 fuel cell applications :Improving oxygen reduction activity through the manipulation of size, shape, and composition. - 1 online resource (147 pages)

Source: Dissertation Abstracts International, Volume: 78-01(E), Section: B.

Thesis (Ph.D.)

Includes bibliographical references

In this dissertation, the oxygen reduction activity of metal nanoparticle electrocatalysts is improved through the manipulation of their size, shape, and composition. The design of superior catalysts first requires identifying processes that limit overall performance. On both silver and platinum electrodes, the rate of oxygen reduction is limited by the initial proton/electron transfer to O2, however the limited site availability also limits ORR activity of platinum at high electrochemical potentials. Different approaches must employed to improve the activity of platinum and silver electrocatalysts.

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

Mode of access: World Wide Web

ISBN: 9781369082272Subjects--Topical Terms:

555952
Chemical engineering.
Index Terms--Genre/Form:

554714
Electronic books.

Development of cathodic electrocatalysts for low temperature H2 fuel cell applications : = Improving oxygen reduction activity through the manipulation of size, shape, and composition.
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245 1 0 $a Development of cathodic electrocatalysts for low temperature H2 fuel cell applications : $b Improving oxygen reduction activity through the manipulation of size, shape, and composition.
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300 $a 1 online resource (147 pages)
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500 $a Source: Dissertation Abstracts International, Volume: 78-01(E), Section: B.
500 $a Adviser: Suljo Linic.
502 $a Thesis (Ph.D.) $c University of Michigan $d 2016.
504 $a Includes bibliographical references
520 $a In this dissertation, the oxygen reduction activity of metal nanoparticle electrocatalysts is improved through the manipulation of their size, shape, and composition. The design of superior catalysts first requires identifying processes that limit overall performance. On both silver and platinum electrodes, the rate of oxygen reduction is limited by the initial proton/electron transfer to O2, however the limited site availability also limits ORR activity of platinum at high electrochemical potentials. Different approaches must employed to improve the activity of platinum and silver electrocatalysts.
520 $a The first project in this thesis describes the development of Pt alloy electrocatalysts with enhanced ORR activity compared to Pt/C standards. The design of Pt monolayer electrocatalysts is informed by quantum chemical calculations. By understanding how alloying impacts the reactivity of surface atoms, we are able to prepare a special class of catalysts with finely tunable activity dependent upon the composition of their nanoparticle core. The best performing materials have specific activities up to four times higher than Pt/C electrocatalysts. Rigorous characterization and electrochemical testing confirm these enhancements and the observed trends in activity result from the alloy structure rather than size and shape effects.
520 $a The second project focuses on controlling the morphology of Ag electrocatalysts in order to improve their alkaline ORR activity. In this study, the rates on Ag nanospheres and Ag nanocubes are compared over a wide range of metal loadings. Contrary to our original hypothesis, nanospheres are found to be slightly more active than nanocubes. Rigorous experimental work confirms the reported shape dependence effects are consistent with the relative abundance of 111 and 100 sites on Ag nanoparticles.
533 $a Electronic reproduction. $b Ann Arbor, Mich. : $c ProQuest, $d 2018
538 $a Mode of access: World Wide Web
650 4 $a Chemical engineering. $3 555952
650 4 $a Energy. $3 784773
655 7 $a Electronic books. $2 local $3 554714
690 $a 0542
690 $a 0791
710 2 $a ProQuest Information and Learning Co. $3 1178819
710 2 $a University of Michigan. $b Chemical Engineering. $3 1181977
773 0 $t Dissertation Abstracts International $g 78-01B(E).
856 4 0 $u http://pqdd.sinica.edu.tw/twdaoapp/servlet/advanced?query=10153095 $z click for full text (PQDT)