國立虎尾科技大學 |

Catalyst layer design in polymer membrane fuel cells.

紀錄類型:	書目-語言資料,手稿 : Monograph/item
正題名/作者:	Catalyst layer design in polymer membrane fuel cells./
作者:	Stariha, Sarah.
面頁冊數:	1 online resource (75 pages)
附註:	Source: Dissertation Abstracts International, Volume: 77-12(E), Section: B.
Contained By:	Dissertation Abstracts International77-12B(E).
標題:	Chemical engineering. -
電子資源:	click for full text (PQDT)
ISBN:	9781339841212

Catalyst layer design in polymer membrane fuel cells.
Stariha, Sarah.

Catalyst layer design in polymer membrane fuel cells. - 1 online resource (75 pages)

Source: Dissertation Abstracts International, Volume: 77-12(E), Section: B.

Thesis (Ph.D.)

Includes bibliographical references

One of the biggest obstacles to commercializing polymer electrolyte membrane fuel cells is the use of platinum as a catalyst. One way to overcome this obstacle is to replace platinum with non-platinum group metal (non-PGM) catalysts, particularly for the oxygen reduction reaction (ORR) in proton exchange membrane fuel cells (PEMFCs). The most realistic method of estimating the performance of non-PGM catalysts is testing within membrane electrode assemblies (MEAs). One key issue is that non-PGM catalysts are not as active as platinum. One way to increase their performance is to optimize the catalyst layer composition, specifically the components responsible for ionic and electronic conductivity. The first objective of this work was to determine the optimal ionomer-to-catalyst ratio and additional carbon content within the catalyst layer. Another problem that arises when replacing platinum with non-PGM catalysts is the catalyst layer thickness. Platinum catalyst layers are on the order of 10 microm whereas non-PGM catalyst layers are on the order of 60-120 microm. Although this increase in catalyst allows for more active sites it causes challenges in transport performance by elongating pore channels. From this the second objective of this work was to examine the chemistry and morphology of both the non-PGM catalysts and sprayed catalyst layers and their effects on MEA performance.

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

Mode of access: World Wide Web

ISBN: 9781339841212Subjects--Topical Terms:

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

554714
Electronic books.

Catalyst layer design in polymer membrane fuel cells.
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100 1 $a Stariha, Sarah. $3 1182108
245 1 0 $a Catalyst layer design in polymer membrane fuel cells.
264 0 $c 2016
300 $a 1 online resource (75 pages)
336 $a text $b txt $2 rdacontent
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500 $a Source: Dissertation Abstracts International, Volume: 77-12(E), Section: B.
500 $a Advisers: Plamen Atanassov; Barr Halevi.
502 $a Thesis (Ph.D.) $c The University of New Mexico $d 2016.
504 $a Includes bibliographical references
520 $a One of the biggest obstacles to commercializing polymer electrolyte membrane fuel cells is the use of platinum as a catalyst. One way to overcome this obstacle is to replace platinum with non-platinum group metal (non-PGM) catalysts, particularly for the oxygen reduction reaction (ORR) in proton exchange membrane fuel cells (PEMFCs). The most realistic method of estimating the performance of non-PGM catalysts is testing within membrane electrode assemblies (MEAs). One key issue is that non-PGM catalysts are not as active as platinum. One way to increase their performance is to optimize the catalyst layer composition, specifically the components responsible for ionic and electronic conductivity. The first objective of this work was to determine the optimal ionomer-to-catalyst ratio and additional carbon content within the catalyst layer. Another problem that arises when replacing platinum with non-PGM catalysts is the catalyst layer thickness. Platinum catalyst layers are on the order of 10 microm whereas non-PGM catalyst layers are on the order of 60-120 microm. Although this increase in catalyst allows for more active sites it causes challenges in transport performance by elongating pore channels. From this the second objective of this work was to examine the chemistry and morphology of both the non-PGM catalysts and sprayed catalyst layers and their effects on MEA performance.
520 $a Another polymer electrolyte membrane fuel cell and an alternative to PEMFCs are anion exchange membrane fuel cells (AEMFCs). Unlike the corrosive environment in PEMFCs, the alkaline environment of AEMFCs is much more conducive to non-PGM catalysts. The problem is that AEMFC technology is decades behind that of PEMFC, particularly the anion exchange membranes and their stability. Because of this there is very little data on alkaline MEA assembly and testing. The third objective of this work was to integrate new Ni-based hydrogen oxidation reaction (HOR) catalysts into alkaline MEAs. A large part of this objective was designing a reproducible protocol for making these MEAs.
520 $a From this work it was concluded that within the catalyst layer the amount of ionomer plays a key role in MEA performance as does any additional carbon added. In general higher amounts of NafionRTM ionomer lead to poor overall performance most likely do to pore and active site blocking and loss of electronic conductivity. This can be corrected with the addition of carbon. It was found that the catalyst layer morphology also plays an important role in MEA performance, specifically pore connectivity. Lastly it was shown that a reproducible protocol for making alkaline MEAs was established and is comparable to what has been reported in the literature. Also initial MEA data for Nickel-Molybdenum-Copper HOR catalysts was successfully acquired for the first time.
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
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690 $a 0791
710 2 $a ProQuest Information and Learning Co. $3 1178819
710 2 $a The University of New Mexico. $b Chemical Engineering. $3 1182109
773 0 $t Dissertation Abstracts International $g 77-12B(E).
856 4 0 $u http://pqdd.sinica.edu.tw/twdaoapp/servlet/advanced?query=10126063 $z click for full text (PQDT)