Carbon dioxide evolution patterns in direct methanol fuel cells

Argyropoulos, P.; Scott, Keith; Taama, W.M.

doi:10.1016/s0013-4686(99)00102-4

Cited by 165 publications

(99 citation statements)

References 4 publications

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“…This includes the very sluggish methanol oxidation reaction, methanol crossover through the polymeric proton exchange membrane, CO 2 evolvement at the anode (Argyropoulos et al, 1999a(Argyropoulos et al, ,1999bNordlund et al, 2002;Scott et al, 1998), and cathode flooding (Amphlett et al, 2001;M. Mench et al, 2001;X.…”

Section: Wwwintechopencommentioning

confidence: 99%

Organic/Inorganic Nanocomposite Membranes Development for Low Temperature Fuel Cell Applications

Mokrani¹

2012

Advances in Chemical Engineering

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Section: Wwwintechopencommentioning

confidence: 99%

Organic/Inorganic Nanocomposite Membranes Development for Low Temperature Fuel Cell Applications

Mokrani¹

2012

Advances in Chemical Engineering

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“…The common alkaline electrolyte used in AFCs has been aqueous potassium hydroxide due to its low cost and high solubility. The carbon dioxide in air reacts with the potassium hydroxide electrolyte forming potassium carbonate as in Equation [1][2][3][4][5].…”

Section: Alkaline Fuel Cell (Afc)mentioning

confidence: 99%

“…At the cathode, the air flow becomes saturated with product water and flooding can occur at high current densities. However, the problem of cathodic flooding in the DMFC has not shown to limit cell performance in the typical DMFC operating current densities [4].…”

Section: Direct Methanol Fuel Cell (Dmfc)mentioning

confidence: 99%

Nanostructured electrocatalyst for fuel cells : silica templated synthesis of Pt/C composites.

Stechel¹,

Switzer²,

Fujimoto³

et al. 2007

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Platinum-based electrocatalysts are currently required for state-of-the-art fuel cells and represent a significant portion of the overall fuel cell cost. If fuel cell technology is to become competitive with other energy conversion technologies, improve the utilization of precious metal catalysts is essential. A primary focus of this work is on creating enhanced nanostructured materials which improve precious-metal utilization. The goal is to engineer superior electrocatalytic materials through the synthesis, development and investigation of novel templated open frame structures synthesized in an aerosol-based approach.Bulk templating methods for both Pt/C and Pt-Ru composites are evaluated in this study and are found to be limited due to the fact that the nanostructure is not maintained throughout the entire sample. Therefore, an accurate examination of structural effects was previously impossible. An aerosol-based templating method of synthesizing nanostructured Pt-Ru electrocatalysts has been developed wherein the effects of structure can be related to electrocatalytic performance. The aerosol-based templating method developed in this work is extremely versatile as it can be conveniently modified to synthesize alternative materials for other systems. The synthesis method was able to be extended to nanostructured Pt-Sn for ethanol oxidation in alkaline media. Nanostructured Pt-Sn electrocatalysts were evaluated in a unique approach tailored to electrocatalytic studies in alkaline media. At low temperatures, nanostructured Pt-Sn electrocatalysts were found to have significantly higher ethanol oxidation activity than a comparable nanostructured Pt catalyst. At higher temperatures, the oxygen-containing species contribution likely provided by Sn is insignificant due to a more oxidized Pt surface. The importance of the surface coverage of oxygen-containing species in the reaction mechanism is established in these studies. The investigations in this work present original studies of anion exchange ionomers as entrapment materials for rotating disc electrode (RDE) studies in alkaline media. Their significance is linked to the development of membrane electrode assemblies (MEAs) with the same ionomer for a KOH-free alkaline fuel cell (AFC). 4 5

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“…Several studies on the two-phase flow patterns in the anode flow field have been reported recently. Argyropoulos et al [5] studied the CO 2 bubble flow characteristics in a DMFC based on two different parallel flow channels. It was observed that there were three two-phase flow patterns, including bubbly, slug and annular flow according to different levels of gas fraction, and gas slug clogging often occurred in some of the flow channels of the parallel flow fields.…”

Section: Introductionmentioning

confidence: 99%

“…Wong et al [6] visually studied an in-house fabricated micro DMFC with various-sized micro single serpentine channels down to 400.0 μm and demonstrated that the CO 2 bubble behavior depended on the channel width. The study of mass transport in the anode has mainly been focused on flow field geometry, the flow field design and the operating conditions [5][6][7][8][9][10][11][12]. However, there are few combination of research on two-phase flow and its temperature characteristics.…”

Section: Introductionmentioning

confidence: 99%

Study on Two-Phase Flow and Temperature Characteristics of Direct Methanol Fuel Cells

Xia¹,

Yuan²,

Zhang³

et al. 2015

Proceedings of the 2015 Asia-Pacific Energy Equipment Engineering Research Conference

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Abstract-Visualization study of two-phase flow in serpentine anode flow field of a liquid-feed direct methanol fuel cell (DMFC) was performed, and also the internal temperature characteristics of the flow in the DMFC have been studied in order to investigate the effect of important operating parameters. The results show that the two-phase flow behavior in the serpentine anode flow field with different flow rate of methanol solution is similar to each other. It was a similar periodical repetition of a process of bubble formation, detachment and coalescence to gas slug in the serpentine flow field. The flow rate of methanol solution can influence the mass transport of methanol and the internal temperature in the flow channel. On one hand, an increase in flow rate will lead to an increase in the gas bubble removal rate, which can increase the fuel cell performance. On the other hand, the increased flow rate of methanol solution will also take more heat of reaction away and reduce the temperature in the flow channel, which will degrade the fuel cell performance.

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Carbon dioxide evolution patterns in direct methanol fuel cells

Cited by 165 publications

References 4 publications

Organic/Inorganic Nanocomposite Membranes Development for Low Temperature Fuel Cell Applications

Organic/Inorganic Nanocomposite Membranes Development for Low Temperature Fuel Cell Applications

Nanostructured electrocatalyst for fuel cells : silica templated synthesis of Pt/C composites.

Study on Two-Phase Flow and Temperature Characteristics of Direct Methanol Fuel Cells

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