Recent progress in passive direct methanol fuel cells at KIST

Kim, Daejin; Cho, Eun Ae; Hong, Seung‐Chyul; Oh, In‐Hwan; Ha, Heung Yong

doi:10.1016/j.jpowsour.2003.12.023

Cited by 173 publications

(73 citation statements)

References 14 publications

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“…Operating the cell without the SC (both GDEs were fixed on the same Nafion® 212 membrane) gave the best performance with 38(5) mW cm -2 maximum. This value is quite comparable to literature data for passive DMFCs, but for a semi-passive DMFC it seems to be worse [10,[14][15][16][17]. A reason for this might be that the GDE was not hot-pressed with the membrane and therefore the contact between them is not at its optimum.…”

Section: Results For the Current-voltage Characteristicssupporting

confidence: 85%

Novel Options and Limitations of Methanol‐Based Production and Storage for Mobile Applications

et al. 2014

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Methanol is considered a promising liquid fuel in context with electrochemical energy conversion and storage for mobile applications. It is shown here that a direct methanol fuel cell can be used for spontaneous charging and discharging a supercapacitor for intermediate storage of chemical energy. Thereby, protons and electrons of the methanol-derived hydrogen are stored separately in the electrical double layer of the supercapacitor electrode. The charging and discharging of this fuel cell-supercapacitor hybride device is investigated in experiments of spontaneous conditions (closed circuit) and also under externally enforced constant voltage sweep rate (cyclic voltammetry) and under constant current conditions. Alternatively, gas phase hydrogen is generated from methanol in an electroreforming process. When more efficient anode electrocatalysts become available this may become the method of choice for on-board and on demand hydrogen production in mobile applications.

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Section: Results For the Current-voltage Characteristicssupporting

confidence: 85%

Novel Options and Limitations of Methanol‐Based Production and Storage for Mobile Applications

et al. 2014

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“…Up till now direct methanol fuel cells (DMFCs) have been the subject of the most development. [1][2][3] DMFCs have been technologically exploited for powering small portable electronic devices,h owever the toxicity of methanol, together with its flammability and high vapor pressure at room temperature severelyh ampered full technological exploitation.M oreover,m ethanol oxidation occurs via pathways involvingt he formation of adsorbed CO, which causes electrocatalyst poisoning and ultimately results in significant performance degradation.C onsequently,h igh loadings of PtRu/Ca lloy electrocatalysts are required to achieves ufficient performance. Additionally,c oncerns aboutt he overall energy efficiency of DMFCs have also been recently raised.…”

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confidence: 99%

Energy Efficiency of Alkaline Direct Ethanol Fuel Cells Employing Nanostructured Palladium Electrocatalysts

et al. 2015

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Carbon supported nanostructured palladium or palladium alloys are considered the best performing anode electrocatalysts currently employed in alkaline electrolyte membrane direct ethanol fuel cells (AEM‐DEFCs). High initial peak power densities are generally obtained as Pd preferentially favors the selective oxidation of ethanol forming acetate thus avoiding strongly poisoning intermediates such as CO. However, few studies exist that investigate DEFC performance in terms of both energy efficiency and discharge energy density, as well as power density depending on the concentration of fuel. In this paper we have determined such parameters for room temperature air breathing AEM‐DEFCs equipped with Pd based anodes, anion exchange membranes and FeCo/C cathode electrocatalysts. Combined with the optimization of the fuel composition a maximum energy efficiency of ≈7 % was obtained for this AEM‐DEFC. Such a performance suggests that devices of this type are suitable for supplying low power applications such as small portable electronic devices.

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“…Direct methanol and other fuel cell technologies have been advanced to the point of use in many demonstration projects that have built thousands of fuel cells in configurations that allow direct use in portable devices. Recent progress in fuel cell portable power applications has shown higher energy density than state-of-the-art batteries see e.g., [14][15][16].…”

Section: Recent Technological Progress Of Fuel Cellsmentioning

confidence: 99%

On the role of fuel cells and hydrogen in a more sustainable and renewable energy future

Brouwer

2010

Current Applied Physics

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Recent progress in passive direct methanol fuel cells at KIST

Cited by 173 publications

References 14 publications

Novel Options and Limitations of Methanol‐Based Production and Storage for Mobile Applications

Novel Options and Limitations of Methanol‐Based Production and Storage for Mobile Applications

Energy Efficiency of Alkaline Direct Ethanol Fuel Cells Employing Nanostructured Palladium Electrocatalysts

On the role of fuel cells and hydrogen in a more sustainable and renewable energy future

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