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Microfluidic platforms and fundament...

Cohen, Jamie Lee.

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Microfluidic platforms and fundamental electrocatalysis studies for fuel cell applications.

紀錄類型:	書目-語言資料,印刷品 : Monograph/item
正題名/作者:	Microfluidic platforms and fundamental electrocatalysis studies for fuel cell applications./
作者:	Cohen, Jamie Lee.
面頁冊數:	478 p.
附註:	Adviser: Hector D. Abruna.
Contained By:	Dissertation Abstracts International68-08B.
標題:	Chemistry, Analytical. -
電子資源:	http://pqdd.sinica.edu.tw/twdaoapp/servlet/advanced?query=3276772
ISBN:	9780549198253

Microfluidic platforms and fundamental electrocatalysis studies for fuel cell applications.
Cohen, Jamie Lee.

Microfluidic platforms and fundamental electrocatalysis studies for fuel cell applications. - 478 p.

Adviser: Hector D. Abruna.

Thesis (Ph.D.)--Cornell University, 2007.

The fabrication and testing of a planar membraneless microchannel fuel cell, based on a silicon microchannel, is described in detail. Laminar flow of fuel and oxidant streams, one on top of the other, prevents fuel crossover while allowing ionic transport at the interface between the two solutions. By employing laminar flow, the useful functions of a membrane are retained, while bypassing its inherent limitations. The planar design maximizes the anode and cathode areas, and elimination of the membrane affords broad flexibility in the choice of fuel and oxidant. Fuels including formic acid, methanol, ethanol, sodium borohydride and hydrogen were tested along with oxidants such as oxygen, hydrogen peroxide and potassium permanganate. Steps taken to improve voltage, current density, and overall power output have been addressed, including the testing of a dual electrolyte system and the use of micro-patterned electrode surfaces to enhance fuel utilization.

ISBN: 9780549198253Subjects--Topical Terms:

586156
Chemistry, Analytical.

Microfluidic platforms and fundamental electrocatalysis studies for fuel cell applications.
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245 1 0 $a Microfluidic platforms and fundamental electrocatalysis studies for fuel cell applications.
300 $a 478 p.
500 $a Adviser: Hector D. Abruna.
500 $a Source: Dissertation Abstracts International, Volume: 68-08, Section: B, page: 5187.
502 $a Thesis (Ph.D.)--Cornell University, 2007.
520 $a The fabrication and testing of a planar membraneless microchannel fuel cell, based on a silicon microchannel, is described in detail. Laminar flow of fuel and oxidant streams, one on top of the other, prevents fuel crossover while allowing ionic transport at the interface between the two solutions. By employing laminar flow, the useful functions of a membrane are retained, while bypassing its inherent limitations. The planar design maximizes the anode and cathode areas, and elimination of the membrane affords broad flexibility in the choice of fuel and oxidant. Fuels including formic acid, methanol, ethanol, sodium borohydride and hydrogen were tested along with oxidants such as oxygen, hydrogen peroxide and potassium permanganate. Steps taken to improve voltage, current density, and overall power output have been addressed, including the testing of a dual electrolyte system and the use of micro-patterned electrode surfaces to enhance fuel utilization.
520 $a As the complexity of the fuels studied in the microchannel fuel cell increased, it was imperative to characterize these fuels using electrochemical techniques prior to utilization in the fuel cell. The oxidation pathway of the liquid fuel methanol was studied rigorously because of its importance for micro-fuel cell applications. Activation energies for methanol oxidation at a Ptpoly surface were determined using electrochemical techniques, providing a benchmark for the comparison of activation energies of other Pt-based electrocatalysts for methanol oxidation at a given potential. A protocol to obtain Ea values was established in three different electrolytes and experimental parameters that influence the magnitude of these values are discussed in detail. The oxidation pathways of sodium borohydride were also examined at Au, Pt, and Pd surfaces using cyclic voltammetry, chronoamperometry, and rotating disk electrode voltammetry.
520 $a In addition to studies on bulk Ptpoly surfaces, new bulk intermetallic catalysts were characterized for their electrocatalytic activity in formic acid. These intermetallics, including Pt2Ta, Pt3Ta, and PtTi, were compared to Pt in terms of onset of oxidation potential and current density at a given potential. The intermetallic PtPb was also extensively characterized in nine different fuels at room temperature, and at 70°C, and compared to Ptpoly.
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790 $a 0058
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791 $a Ph.D.
792 $a 2007
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