Intermediates Phenomena in Direct Ethanol Fuel Cell

Niwa, Koichi; Hisamatsu, Syohei; Ikuma, Yasuro

doi:10.14723/tmrsj.41.175

Cited by 2 publications

(4 citation statements)

References 6 publications

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“…The output currents of the DEFCs were measured by a previously reported method 10,11 that is schematically shown in Fig. 1.…”

Section: Methodsmentioning

confidence: 99%

Thermodynamically Spontaneous Reactions and Use of Acetaldehyde as Fuel in Direct Ethanol Fuel Cells

Ikuma,

Niwa,

Imamura

2023

ECS Adv.

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A set of fuel cells was fabricated using a cation exchange membrane (CEM), and ethanol and acetaldehyde were used as fuels for the cells. Spontaneous reactions in the fuel cells were studied under various conditions such as excess oxygen at the cathode and at higher temperatures without application of an external voltage and without forcing an external current. When acetaldehyde was used as a fuel, the current in the circuit and the concentration of acetic acid (product of the fuel cells) were not influenced by the experimental conditions. On the other hand, when ethanol was used as a fuel, the current in the circuit and the concentration of acetic acid were influenced by the experimental conditions. It was thus concluded that ethanol is oxidized directly to acetic acid without oxidation to acetaldehyde and then to acetic acid. The calculated ΔG for possible half reactions in direct ethanol fuel cells (DEFCs) with CEM and anion exchange membrane (AEM) suggests that a reliable AEM should be developed for the further development of DEFCs.

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“…The output currents of the DEFCs were measured by a previously reported method 10,11 that is schematically shown in Fig. 1.…”

Section: Methodsmentioning

confidence: 99%

Thermodynamically Spontaneous Reactions and Use of Acetaldehyde as Fuel in Direct Ethanol Fuel Cells

Ikuma,

Niwa,

Imamura

2023

ECS Adv.

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“…The output currents of the DEFCs were measured by the method shown elesewhere 4,8) (resistance of 10Ω was inserted in series to the circuit for electricity measurements). Every 30 min of operation, approximately 2 mL of fuel was sampled to determine the concentration of acetaldehyde and acetic acid generated in the ethanol aqueous solution.…”

Section: Methodsmentioning

confidence: 99%

“…Cathode (2) B CH3CHO+H2O → 2H + +2e -+CH3COOH Anode (3) ½O2+2H + +2e -→ H2O Cathode (4) In addition, we attempted to control the gas atmosphere at the cathode without the use of excess oxygen gas flow, but by adding suitable additives to the cathode paste. Cerium oxide was selected as a cathode additive to control the oxygen partial pressure at the cathode, which should improve the chemical reaction at the anode.…”

Section: Purposementioning

confidence: 99%

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Effect of excess oxygen supply on reaction products of a direct ethanol fuel cell

Niwa

Hisamatsu

Hakuro

et al. 2019

Trans. Mat. Res. Soc. Japan

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The effect of various excess oxygen gas flows at the cathode of a direct ethanol fuel cell (DEFC) was investigated with respect to the reaction products/intermediates. The output current increased with the excess oxygen gas flow. For each oxygen flow, the acetic acid concentration at anode was 5 times higher than the acetaldehyde concentration; therefore, acetaldehyde is readily oxidized to acetic acid or acetic acid is formed directly. This suggests that the output current is mainly dependent on the amount of acetic acid produced. The maximum concentration of acetaldehyde with each output current was almost proportional to that of acetic acid for each oxygen flow condition. The effect of cerium oxide addition to the cathode as another oxygen source to enhance performance was also examined. After an excess oxygen gas flow of 0.6 L/min was stopped, the output current increased for approximately 2 minutes, after which the cerium oxide re-absorbed oxygen to attain equilibrium, which was accompanied by a decrease in the output current until it returned to the same level as that with the excess oxygen gas flow. Thus, the addition of cerium oxide to the cathode enhances oxygen supply for cathodic reactions with a corresponding increase in output current.

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Intermediates Phenomena in Direct Ethanol Fuel Cell

Cited by 2 publications

References 6 publications

Thermodynamically Spontaneous Reactions and Use of Acetaldehyde as Fuel in Direct Ethanol Fuel Cells

Thermodynamically Spontaneous Reactions and Use of Acetaldehyde as Fuel in Direct Ethanol Fuel Cells

Effect of excess oxygen supply on reaction products of a direct ethanol fuel cell

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