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Insights into the performance of pro...

Feindel, Kirk Wayne.

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Insights into the performance of proton-exchange membrane fuel cells obtained from hydrogen NMR microscopy experiments.

紀錄類型:	書目-語言資料,印刷品 : Monograph/item
正題名/作者:	Insights into the performance of proton-exchange membrane fuel cells obtained from hydrogen NMR microscopy experiments./
作者:	Feindel, Kirk Wayne.
面頁冊數:	127 p.
附註:	Source: Dissertation Abstracts International, Volume: 68-07, Section: B, page: 4508.
Contained By:	Dissertation Abstracts International68-07B.
標題:	Chemistry, Inorganic. -
電子資源:	http://pqdd.sinica.edu.tw/twdaoapp/servlet/advanced?query=NR29672
ISBN:	9780494296721

Insights into the performance of proton-exchange membrane fuel cells obtained from hydrogen NMR microscopy experiments.
Feindel, Kirk Wayne.

Insights into the performance of proton-exchange membrane fuel cells obtained from hydrogen NMR microscopy experiments. - 127 p.

Source: Dissertation Abstracts International, Volume: 68-07, Section: B, page: 4508.

Thesis (Ph.D.)--University of Alberta (Canada), 2007.

Proton nuclear magnetic resonance microscopy was employed to investigate in-situ the effects of the distribution and amount of water in operating proton-exchange membrane fuel cells, PEMFCs. This is a timely and significant application of NMR microscopy for numerous reasons. The quintessence of a PEMFC is the membrane that is conductive to protons while essentially impermeable to the fuel and non-conductive to electrons. The performance of PEMFCs using typical proton-exchange membranes, PEMs, such as Nafion is closely related to the distribution and content of water in the PEM and neighbouring regions (e.g., gas flow channels). Few available techniques, however, can be used to visualize and investigate water in operating PEMFCs and obtain information that is critical to develop effective designs and to parameterize and validate theoretical models.

ISBN: 9780494296721Subjects--Topical Terms:

517253
Chemistry, Inorganic.

Insights into the performance of proton-exchange membrane fuel cells obtained from hydrogen NMR microscopy experiments.
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245 1 0 $a Insights into the performance of proton-exchange membrane fuel cells obtained from hydrogen NMR microscopy experiments.
300 $a 127 p.
500 $a Source: Dissertation Abstracts International, Volume: 68-07, Section: B, page: 4508.
502 $a Thesis (Ph.D.)--University of Alberta (Canada), 2007.
520 $a Proton nuclear magnetic resonance microscopy was employed to investigate in-situ the effects of the distribution and amount of water in operating proton-exchange membrane fuel cells, PEMFCs. This is a timely and significant application of NMR microscopy for numerous reasons. The quintessence of a PEMFC is the membrane that is conductive to protons while essentially impermeable to the fuel and non-conductive to electrons. The performance of PEMFCs using typical proton-exchange membranes, PEMs, such as Nafion is closely related to the distribution and content of water in the PEM and neighbouring regions (e.g., gas flow channels). Few available techniques, however, can be used to visualize and investigate water in operating PEMFCs and obtain information that is critical to develop effective designs and to parameterize and validate theoretical models.
520 $a The ultimate goal of this research was to demonstrate that 1H NMR microscopy can provide a qualitative picture of dynamic water distribution in operating PEMFCs and, that PEMFC performance can quantitatively be related to the amount of water in various parts of the system.
520 $a PEMFCs were designed and constructed to fit within 10 mm and 30 mm diameter NMR microscopy probes and to operate within the strong magnetic fields required to complete the studies. Preliminary experiments demonstrated that H 2O(l) produced from the reduction of O2( g) is observable, and that water in the PEM diffuses outward from the catalyst decal into surrounding membrane. The first images of the in-plane distribution of water in the PEM between the catalyst layers are reported. The results show that feed gas configuration (i.e., co- vs. counter-flow), gas flow rates, and PEMFC power output affect the distribution of water in the PEM and in the cathode flow field, and confirm the predictions of several theoretical models. Image contrast is introduced by exchanging hydrogen for deuterium through use of either D2O(l) or by operating the PEMFC on D2(g). The integrated intensity of the images corresponds well to changes in the PEMFC power output, and the feasibility of determining the absolute water content of the PEM is investigated. The results obtained suggest several projects for future research.
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650 4 $a Chemistry, Physical. $3 560527
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790 $a 0351
791 $a Ph.D.
792 $a 2007
856 4 0 $u http://pqdd.sinica.edu.tw/twdaoapp/servlet/advanced?query=NR29672