Fabrication of miniaturised Si-based electrocatalytic membranes

D’Arrigo, Giuseppe; Spinella, C.; Arena, Giuseppe; Lorenti, Simona

doi:10.1016/s0928-4931(02)00228-x

Cited by 57 publications

(37 citation statements)

References 4 publications

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“…For example, a catalyzed membrane integrated on a silicon or polymeric matrix through micromachining processes has recently emerged as a possible way to fabricate miniaturized DMFCs [217,218]. Thanks to integrated-circuit (IC) technology [219], micro-channel patterns of mDMFCs bipolar plates, into which reactants are fed, can be featured on an Si or polymeric matrix with high resolution and good repeatability.…”

Section: Stack Hardware and Designmentioning

confidence: 99%

Direct Methanol Fuel Cells: History, Status and Perspectives

Aricò

Baglio

Antonucci

2009

Electrocatalysis of Direct Methanol Fuel Cells

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Section: Stack Hardware and Designmentioning

confidence: 99%

Direct Methanol Fuel Cells: History, Status and Perspectives

Aricò

Baglio

Antonucci

2009

Electrocatalysis of Direct Methanol Fuel Cells

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“…At present, the membranes commonly used in practical fuel cells systems [2,3] and micro-fuel cells [4][5][6] are based on perfluorosulfonic ionomer like Nafion® because of high proton conductivity, and good chemical and mechanical stability. However, they present real disadvantage in terms of costs, CO tolerance, and temperature of functioning [7] and, moreover, are not easily integrated with standard micro-fabrication techniques used in making micro fuel cell, owing to the possible volumetric changes with hydration level.…”

Section: Introductionmentioning

confidence: 99%

Nanoscale membrane electrode assemblies based on porous anodic alumina for hydrogen–oxygen fuel cell

Bocchetta¹,

Conciauro²,

Quarto³

2007

J Solid State Electrochem

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In this paper, we demonstrate that nanoscale membrane electrode assemblies, functioning in a H 2 /O 2 fuel cell, can be fabricated by impregnation of anodic alumina porous membranes with Nafion® and phosphotungstic acid. Porous anodic alumina is potentially a promising material for thin-film micro power sources because of its ability to be manipulated in micro-machining operations. Alumina membranes (Whatman, 50 μm thick, and pore diameters of 200 nm) impregnated with the proton conductor were characterized by means of scanning electron microscopy, X-ray diffraction, and thermal analysis. The electrochemical characterization of the membrane electrode assemblies was carried out by recording the polarization curves of a hydrogen-oxygen 5 cm 2 fuel cell working at low temperatures (25÷80°C) in humid atmosphere. Our assemblies realized with alumina membranes filled with phosphotungstic acid and Nafion® reach respectively the peak powers of 20 and 4 mW/cm 2 at room temperature using hydrogen and oxygen as fuel and oxidizer.

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“…Most commonly, various micro fuel cell designs are fabricated on silicon substrate using advanced silicon-processing and thin film technology such as photolithographic pattering, dry and wet etching, chemical and physical vapor deposition, spin-cast coating [5][6][7][8]. Most of these micro fuel cells were tested using hydrogen but could use methanol as fuel with further adaptation.…”

Section: Bio-fuel Cell (Bfc)mentioning

confidence: 99%

“…Most of these micro fuel cells were tested using hydrogen but could use methanol as fuel with further adaptation. The designs can be either monolithic [5,6] or bilayer [6][7][8]. It was found that bilayer design had a much better performance than monolithic design [6].…”

Section: Bio-fuel Cell (Bfc)mentioning

confidence: 99%

06/00145 Valveless piezoelectric micropump for fueldelivery in direct methanol fuel cell (DMFC) devices

2006

Fuel and Energy Abstracts

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Presented in this dissertation is the study of a novel fuel delivery system combined with miniaturized direct methanol fuel cell (DMFC). The core component of this system is a valveless micropump driven by ring-type piezoelectric bending actuator. By applying an alternating electrical field across the actuator, the resultant reciprocating movement of the pump diaphragm can be converted into pumping effect. Nozzle/diffuser elements are used to direct the flow. To make the power system applicable for portable electronic devices, the micropump needs to meet some specific requirements: low power consumption but sufficient fuel flow rate. In this study, both theoretical and experimental methods have been used to investigate the effects of materials properties, actuator dimensions, driving voltage, driving frequency, nozzle/diffuser dimension, and other factors on the performance of the whole system. As a result, a viable design of micropump system for fuel delivery in DMFC devices has been achieved and some further improvements are suggested.In the beginning of this dissertation, the history, working principle, types, and current research status of both fuel cell and micropump are reviewed. Following this comprehensive introduction, the research objective to develop a novel portable power system that combines fuel cell technology and micropump technology is presented. To help design such a system, a series of analytical models are established to estimate the deflection, volume change, flow rate, and power iv consumption of the micropump. Both finite element method (FEM) and experimental method are applied to verify the models. Based on the analytical analysis, material properties and dimensions of the micropump actuator are optimized to obtain maximum flow rate and minimum power consumption. Later a separated micropump prototype has been fabricated and tested. It is observed that the performance of a DMFC device is improved by using this micropump to supply fuel. In addition, the electrochemical impedance analysis of this fuel cell device is conducted to try to understand the reasons for the performance improvement. Finally, the accomplishments of this study are summarized and future perspective is provided.v

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Fabrication of miniaturised Si-based electrocatalytic membranes

Cited by 57 publications

References 4 publications

Direct Methanol Fuel Cells: History, Status and Perspectives

Direct Methanol Fuel Cells: History, Status and Perspectives

Nanoscale membrane electrode assemblies based on porous anodic alumina for hydrogen–oxygen fuel cell

06/00145 Valveless piezoelectric micropump for fueldelivery in direct methanol fuel cell (DMFC) devices

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