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Electrocatalyst Materials for Low-Temperature Hydrogen Fuel Cells.

紀錄類型:	書目-電子資源 : Monograph/item
正題名/作者:	Electrocatalyst Materials for Low-Temperature Hydrogen Fuel Cells./
作者:	Siso, Gerard Montserrat.
面頁冊數:	1 online resource (117 pages)
附註:	Source: Dissertations Abstracts International, Volume: 84-09, Section: B.
Contained By:	Dissertations Abstracts International84-09B.
標題:	Thermodynamics. -
電子資源:	http://pqdd.sinica.edu.tw/twdaoapp/servlet/advanced?query=30319241click for full text (PQDT)
ISBN:	9798374475456

Electrocatalyst Materials for Low-Temperature Hydrogen Fuel Cells.
Siso, Gerard Montserrat.

Electrocatalyst Materials for Low-Temperature Hydrogen Fuel Cells. - 1 online resource (117 pages)

Source: Dissertations Abstracts International, Volume: 84-09, Section: B.

Thesis (Ph.D.)--Chalmers Tekniska Hogskola (Sweden), 2023.

Includes bibliographical references

Fuel cells have emerged as an alternative to satisfy the need of energy systems with net-zero emissions. Although fuel cells date back to the 1800s, it is only during the last decades that research and development has enabled true commercialization. The growing interest in fuel cells implementation goes hand in hand with the decrease in green H2 production cost, which makes fuel cells a cornerstone in promising energy systems based on H2. It is crucial that the transport sector shifts towards inexpensive carbon-free fuel alternatives, which is possible with H2 owing to its high energy density. A broad implementation of fuel cells is, however, impeded by the high cost of fuel cell systems, which can be attributed to the Pt-based catalyst currently used in low-temperature hydrogen fuel cells. As Pt is a scarce expensive material, development of new efficient and inexpensive electrocatalysts is essential for large-scale fuel cells implementation.Although many strategies have been explored to reduce the amount of Pt without compromising the power output and lifetime, electrocatalyst development is currently hindered by the lack of mechanistic understanding. In order to gain a better understanding of the mechanisms behind the electrochemical reactions in proton exchange membrane fuel cells (PEMFC) and anion exchange membrane fuel cells (AEMFC), this thesis delves into both the fabrication and the characterization of electrocatalysts. A versatile platform was established to study model system catalysts with the aim to test electrocatalytic materials and provide reliable comparisons, making their performance rationalizable in terms of geometric and electronic structure. Pt-rare earth metal (REM) alloys were studied with respect to both their activity and stability towards the oxygen reduction reaction (ORR) in PEMFCs. Measurements with different model systems indicated an overall increase in their specific activity, but it was found that the addition of REM could compromise their stability. Different Ag alloys were studied for the ORR in alkaline conditions. It was found that alloying could improve the binding energy of oxygenated species, which enhances their ORR activity. Hydrogen oxidation reaction (HOR) and ORR activity of PdNi annealed thin films in alkaline media were investigated to pinpoint the mechanism behind the increased activity. This provides insights to the fundamental principles that lead to a good catalyst efficiency, which was also tested with the addition of different ionomers. By providing additional insights on the mechanistic aspects of fuel cell reactions, the presented work takes a step in tailoring new electrocatalytic materials that could eventually outperform bare Pt in terms of both activity and stability while reducing the total fuel cell cost.

Electronic reproduction.
Ann Arbor, Mich. :
ProQuest,
2023

Mode of access: World Wide Web

ISBN: 9798374475456Subjects--Topical Terms:

517304
Thermodynamics.
Index Terms--Genre/Form:

542853
Electronic books.

Electrocatalyst Materials for Low-Temperature Hydrogen Fuel Cells.
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100 1 $a Siso, Gerard Montserrat. $3 3701367
245 1 0 $a Electrocatalyst Materials for Low-Temperature Hydrogen Fuel Cells.
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300 $a 1 online resource (117 pages)
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500 $a Source: Dissertations Abstracts International, Volume: 84-09, Section: B.
500 $a Advisor: Wickman, Bjorn.
502 $a Thesis (Ph.D.)--Chalmers Tekniska Hogskola (Sweden), 2023.
504 $a Includes bibliographical references
520 $a Fuel cells have emerged as an alternative to satisfy the need of energy systems with net-zero emissions. Although fuel cells date back to the 1800s, it is only during the last decades that research and development has enabled true commercialization. The growing interest in fuel cells implementation goes hand in hand with the decrease in green H2 production cost, which makes fuel cells a cornerstone in promising energy systems based on H2. It is crucial that the transport sector shifts towards inexpensive carbon-free fuel alternatives, which is possible with H2 owing to its high energy density. A broad implementation of fuel cells is, however, impeded by the high cost of fuel cell systems, which can be attributed to the Pt-based catalyst currently used in low-temperature hydrogen fuel cells. As Pt is a scarce expensive material, development of new efficient and inexpensive electrocatalysts is essential for large-scale fuel cells implementation.Although many strategies have been explored to reduce the amount of Pt without compromising the power output and lifetime, electrocatalyst development is currently hindered by the lack of mechanistic understanding. In order to gain a better understanding of the mechanisms behind the electrochemical reactions in proton exchange membrane fuel cells (PEMFC) and anion exchange membrane fuel cells (AEMFC), this thesis delves into both the fabrication and the characterization of electrocatalysts. A versatile platform was established to study model system catalysts with the aim to test electrocatalytic materials and provide reliable comparisons, making their performance rationalizable in terms of geometric and electronic structure. Pt-rare earth metal (REM) alloys were studied with respect to both their activity and stability towards the oxygen reduction reaction (ORR) in PEMFCs. Measurements with different model systems indicated an overall increase in their specific activity, but it was found that the addition of REM could compromise their stability. Different Ag alloys were studied for the ORR in alkaline conditions. It was found that alloying could improve the binding energy of oxygenated species, which enhances their ORR activity. Hydrogen oxidation reaction (HOR) and ORR activity of PdNi annealed thin films in alkaline media were investigated to pinpoint the mechanism behind the increased activity. This provides insights to the fundamental principles that lead to a good catalyst efficiency, which was also tested with the addition of different ionomers. By providing additional insights on the mechanistic aspects of fuel cell reactions, the presented work takes a step in tailoring new electrocatalytic materials that could eventually outperform bare Pt in terms of both activity and stability while reducing the total fuel cell cost.
533 $a Electronic reproduction. $b Ann Arbor, Mich. : $c ProQuest, $d 2023
538 $a Mode of access: World Wide Web
650 4 $a Thermodynamics. $3 517304
650 4 $a Electrodes. $3 629151
650 4 $a Electricity distribution. $3 3562889
650 4 $a Clean technology. $3 3564885
650 4 $a Emissions. $3 3559499
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650 4 $a Energy resources. $3 3561090
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650 4 $a Electrolytes. $3 656992
650 4 $a Physical chemistry. $3 1981412
650 4 $a Gases. $3 559387
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650 4 $a Oxidation. $3 714629
650 4 $a Fossil fuels. $3 701525
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650 4 $a Kinetics. $3 717752
650 4 $a Energy efficiency. $3 3555643
650 4 $a Alternative energy sources. $3 3561089
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710 2 $a Chalmers Tekniska Hogskola (Sweden). $3 1913472
773 0 $t Dissertations Abstracts International $g 84-09B.
856 4 0 $u http://pqdd.sinica.edu.tw/twdaoapp/servlet/advanced?query=30319241 $z click for full text (PQDT)

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