Modelling and simulation of a direct ethanol fuel cell considering multistep electrochemical reactions, transport processes and mixed potentials

Meyer, Marco; Melke, Julia; Gerteisen, Dietmar

doi:10.1016/j.electacta.2011.01.070

Cited by 29 publications

(73 citation statements)

References 23 publications

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“…By way of contrast, due to its larger molecular structure, ethanol has a lower crossover rate than methanol, which together with its slower electrochemical oxidation kinetics produces a lesser effect on the cathode performance [68,69]. The complexity of ethanol electooxidation is originated by the difficulty of breaking the C-C bond [43,61,66,[70][71][72][73][74][75][76][77], a problem that is shared with other higher alcohols.…”

Section: Direct Ethanol Fuel Cells (Defcs)mentioning

confidence: 90%

“…Different reaction mechanisms have been proposed in the literature [38,44,45,50,106]. Due to the large amount of intermediate species, both free and adsorbed, and of potential elementary reactions, mathematical models exhibit different levels of complexity [77,107,108]. As a particular example, Figure 2 shows a reaction mechanism for the EOR on binary Pt-based catalysts recently proposed by the authors [105], based on a previous model by Meyer et al [77] which ignored Reactions I, II, and III.…”

Section: The Ethanol Oxidation Reactionmentioning

confidence: 99%

“…Due to the large amount of intermediate species, both free and adsorbed, and of potential elementary reactions, mathematical models exhibit different levels of complexity [77,107,108]. As a particular example, Figure 2 shows a reaction mechanism for the EOR on binary Pt-based catalysts recently proposed by the authors [105], based on a previous model by Meyer et al [77] which ignored Reactions I, II, and III. The kinetic model assumes that there are eleven elementary reactions, listed in Table 2, involving five adsorbed species, four of them attached to the Pt-sites (CH 3 CHOH ads ,CH 3 CO ads ,CO ads and CH 3ads ), and the fifth (OH ads ) to the secondary metal following the bifunctional catalyst assumption [53][54][55].…”

Section: The Ethanol Oxidation Reactionmentioning

confidence: 99%

“…The ethanol electrooxidation reaction in DEFCs has very complex kinetics with different products [43,61,66,[70][71][72][73][74][75][76][77]. Table 1 shows the global reactions considered in this study (Section 4.1).…”

Section: Ethanol Potentialsmentioning

confidence: 99%

“…As a result, for adsorption/desorption reactions, the catalyst concentration is usually included in the reaction constants, which are thus also strongly affected by the catalysts type. The use of coverage factors in kinetic models of catalytic reactions is widely used in fuel cell modeling [77,[99][100][101][102][103][104], and will be illustrated in the example presented below.…”

Section: Coverage Factorsmentioning

confidence: 99%

See 4 more Smart Citations

Fundamentals of Electrochemistry with Application to Direct Alcohol Fuel Cell Modeling

Sánchez-Monreal¹,

Vera²,

García-Salaberri³

2018

Proton Exchange Membrane Fuel Cell

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Fuel cell modeling is an inherently multiphysics problem. As a result, scientists and engineers trained in different areas are required to work together in this field to address the complex physicochemical phenomena involved in the design and optimization of fuel cell systems. This multidisciplinary approach forces researchers to become accustomed to new concepts. Electrochemical processes, for example, constitute the heart of a fuel cell. Accurate modeling of electrochemical reactions is therefore essential to successfully predict the performance of these devices. However, becoming familiar with the complex concepts of electrochemistry can be an arduous task for those who approach the study of fuel cells from fields other than chemical engineering. This process can extend over time and requires careful reading of many textbooks and papers, the most illuminating ones being hidden to the newcomer in a plethora of recent publications on the subject. The authors, who engaged in the study of fuel cells coming from the field of mechanical engineering, had to travel this road once and, with this contribution, would like to make the journey easier for those who come behind. As an illustrative example, the thermodynamic and electrochemical principles reviewed in this chapter are applied to a complex electrochemical system, the direct ethanol fuel cell (DEFC), reviewing recent work on this problem and suggesting future research directions.

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Section: Direct Ethanol Fuel Cells (Defcs)mentioning

confidence: 90%

Section: The Ethanol Oxidation Reactionmentioning

confidence: 99%

Section: The Ethanol Oxidation Reactionmentioning

confidence: 99%

Section: Ethanol Potentialsmentioning

confidence: 99%

Section: Coverage Factorsmentioning

confidence: 99%

See 3 more Smart Citations

Fundamentals of Electrochemistry with Application to Direct Alcohol Fuel Cell Modeling

Sánchez-Monreal¹,

Vera²,

García-Salaberri³

2018

Proton Exchange Membrane Fuel Cell

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Polyformamidine‐Derived Non‐Noble Metal Electrocatalysts for Efficient Oxygen Reduction Reaction

Pérez

Sahraie

Melke

et al. 2018

Adv Funct Materials

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A facile approach for the template‐free synthesis of highly active non‐noble metal based oxygen reduction reaction (ORR) electrocatalysts is presented. Porous Fe−N−C/Fe/Fe3C composite materials are obtained by pyrolysis of defined precursor mixtures of polyformamidine (PFA) and FeCl3 as nitrogen‐rich carbon and iron sources, respectively. Selection of pyrolysis temperature (700–1100 °C) and FeCl3 loading (5–30 wt%) yields materials with differing surface areas, porosity, graphitization degree, nitrogen and iron content, as well as ORR activity. While the ORR activity of Fe‐free materials is limited (i.e., synthesized from pure PFA), a huge increase in activity is observed for catalysts containing Fe, revealing the participation of the metal dopant in the construction of active electrocatalytic sites. Further activity improvement is achieved via acid‐leaching and repeated pyrolysis, a result which is attributed to the creation of new active sites located at the surface of the porous nitrogen‐doped carbon by dissolution of the Fe and Fe3C nanophases. The best performing catalyst, which was synthesized with a low Fe loading (i.e., 5 wt%) and at a pyrolysis temperature of 900 °C, exhibits high activity, excellent H2O selectivity, extended stability, in both basic and acidic media as well as a remarkable tolerance toward methanol.

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Palladium Paste Nanocomposite Electrode as a New Metallic Electrocatalyst for Ethanol Oxidation and Nonenzymatic Amperometric Sensor in Alkaline Medium

Safavi

Tohidi

2012

Electroanalysis

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Palladium paste nanocomposite electrode was employed as an efficient electrocatalyst for ethanol oxidation and nonenzymatic amperometric ethanol sensor, in alkaline media. The combined application of unique properties of nanomaterials and ionic liquids results in electrodes with interesting advantages compared to the conventional Pd disk electrodes. High tolerance towards accumulation of carbonaceous species (CO‐like intermediates) and poisoning by strongly adsorbed species suggests this electrode suitable for many applications. The sensor has the advantages of high sensitivity, low detection limit (20.0 µM), wide linear range (30.0 µM–1.6 M), ease of renewing the electrode surface, good long‐term stability and reproducibility for ethanol determination.

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Modelling and simulation of a direct ethanol fuel cell considering multistep electrochemical reactions, transport processes and mixed potentials

Cited by 29 publications

References 23 publications

Fundamentals of Electrochemistry with Application to Direct Alcohol Fuel Cell Modeling

Fundamentals of Electrochemistry with Application to Direct Alcohol Fuel Cell Modeling

Polyformamidine‐Derived Non‐Noble Metal Electrocatalysts for Efficient Oxygen Reduction Reaction

Palladium Paste Nanocomposite Electrode as a New Metallic Electrocatalyst for Ethanol Oxidation and Nonenzymatic Amperometric Sensor in Alkaline Medium

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