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Adhesive copper films for an air-breathing polymer electrolyte fuel cell
KTH, School of Chemical Science and Engineering (CHE), Chemical Engineering and Technology, Applied Electrochemistry.
KTH, School of Electrical Engineering (EES), Microsystem Technology.ORCID iD: 0000-0002-9327-2544
KTH, School of Electrical Engineering (EES), Microsystem Technology.ORCID iD: 0000-0001-8248-6670
KTH, School of Chemical Science and Engineering (CHE), Chemical Engineering and Technology, Applied Electrochemistry.
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2005 (English)In: Journal of Power Sources, ISSN 0378-7753, Vol. 144, no 1, 113-121 p.Article in journal (Refereed) Published
Abstract [en]

A design for an air-breathing and passive polymer electrolyte fuel cell is presented. Such a type of fuel cell is in general promising for portable electronics. In the present design, the anode current collector is made of a thin copper foil. The foil is provided with an adhesive and conductive coating, which firstly tightens the hydrogen compartment without mask or clamping pressure, and secondly secures a good electronic contact between the anode backing and the current collector. The cathode comprises a backing, a gold-plated stainless steel mesh and a current collector cut out from a printed circuit board. Three geometries for the cathode current collector were evaluated. Single cells with an active area of 2 cm(2) yielded a peak power of 250-300 MW cm(-2) with air and pure H-2 in a complete passive mode except for the controlled flow of H-2. The cells' response was investigated in steady state and transient modes.

Place, publisher, year, edition, pages
2005. Vol. 144, no 1, 113-121 p.
Keyword [en]
polymer, fuel cell, breathing, adhesive, copper, silicon-wafer, fabrication, design, performance, technology
National Category
Mechanical Engineering
URN: urn:nbn:se:kth:diva-14823DOI: 10.1016/j.jpowsour.2004.12.048ISI: 000229705800013ScopusID: 2-s2.0-18844400608OAI: diva2:332864
QC 20100525Available from: 2010-08-05 Created: 2010-08-05 Last updated: 2010-10-19Bibliographically approved
In thesis
1. Assembly of microsystems for optical and fluidic applications
Open this publication in new window or tab >>Assembly of microsystems for optical and fluidic applications
2005 (English)Doctoral thesis, comprehensive summary (Other scientific)
Abstract [en]

This thesis addresses assembly issues encountered in optical and fluidic microsystem applications.

In optics, the first subject concerns the active alignment of components in optical fibersystems. A solution for reducing the cost of optical component assembly while retaining submicron accuracy is to integrate the alignment mechanism onto the optical substrate. A polymer V-shaped actuator is presented that can carry the weight of the large components - on a micromechanical scale - and that can generate movement with six degrees of freedom.

The second subject in optics is the CMOS-compatible fabrication of monocrystalline silicon micromirror arrays that are intended to serve as CMOS-controlled high-quality spatial light modulators in maskless microlithography systems. A wafer-level assembly method is presented that is based on adhesive wafer bonding whereby a monocrystalline layer is transferred onto a substrate wafer in a CMOS-compatible process without needing bond alignment.

In fluidics, a hybrid assembly method is introduced that combines two separately micromachined structures to create hotwire anemometers that protrude from a surface with minimum interference with the air flow. The assembled sensor enables one to make accurate time-resolved measurements of the wall shear stress, a quantity that has previously been hard to measure with high time resolution. Also in the field of hotwire anemometers, a method using a hotwire anemometer array is presented for measuring the mass flow, temperature and composition of a gas in a duct.

In biochemistry, a bio-analysis chip is presented. Single nucleotide polymorphism scoring is performed using dynamic allele-specific hybridization (DASH). Using monolayers of beads, multiplexing based on single-bead analysis is achieved at heating rates more than 20 times faster than conventional DASH provides.

Space and material e±ciency in packaging are the focus of the other two projects in fluidics. The first introduces an assembly based on layering conductive adhesives for the fabrication of miniature polymer electrolyte membrane fuel cells. The fuel cells made with this low-cost approach perform among the best of their type to date. The second project concerns a new cross-flow microvalve concept. Intended as a step towards the mass production of large-flow I/P converters, the silicon footprint area is minimized by an out-of-plane moving gate and in-plane, half-open pneumatic channels.

Place, publisher, year, edition, pages
Stockholm: KTH, 2005. xiv, 70 p.
Trita-ILA, ISSN 0281-2878 ; 0501
Applied mechanics, microsystem technology, micromachining, assembly, active alignment, BCB, Teknisk mekanik
National Category
Mechanical Engineering
urn:nbn:se:kth:diva-120 (URN)91-7283-958-9 (ISBN)
Public defence
2005-02-11, Kollegiesalen, Valhallavägen 79, Stockholm, 14:00
QC 20101019Available from: 2005-02-09 Created: 2005-02-09 Last updated: 2010-10-19Bibliographically approved

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Jaouen, FrédéricHaasl, Sjoerdvan der Wijngaart, WouterLundblad, AndersLindbergh, GöranStemme, Göran
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