Comprehensive mass transport modeling technique for the cathode side of an open-cathode direct methanol fuel cell

Mudiraj, S.P.; Biswas, M. A. Rafe; Lear, W. E.; Crisalle, O.D.

doi:10.1016/j.ijhydene.2015.04.049

Cited by 17 publications

(6 citation statements)

References 40 publications

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“…Fuel is fed into the fuel cell sack and the oxidation reaction takes place at the catalyst surface at the anode and the reduction occurs at the cathode. The reactions are shown in equations (1)-(3) for DMFC (Mallick et al, 2015;Mudiraj et al, 2015) and equations (4)-(6) for DEFC (Abdullah et al, 2015;Badwal et al, 2015 …”

Section: Accepted Manuscriptmentioning

confidence: 99%

Application of response surface methodology to optimize direct alcohol fuel cell power density for greener energy production

Charoen

Prapainainar

Sureeyatanapas

et al. 2017

Journal of Cleaner Production

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Please cite this article as: Charoen K, Prapainainar C, Sureeyatanapas P, Suwannaphisit T, Wongamornpitak K, Kongkachuichay P, Holmes SM, Prapainainar P, Application of response surface methodology to optimize direct alcohol fuel cell power density for greener energy production, Journal of Cleaner Production (2016Production ( ), doi: 10.1016Production ( /j.jclepro.2016 This is a PDF file of an unedited manuscript that has been accepted for publication. As a service to our customers we are providing this early version of the manuscript. The manuscript will undergo copyediting, typesetting, and review of the resulting proof before it is published in its final form. Please note that during the production process errors may be discovered which could affect the content, and all legal disclaimers that apply to the journal pertain. AbstractEnergy production from direct alcohol fuel cells depends strongly on the operating conditions. In this research, the aim was to find the best conditions of direct methanol fuel cells (DMFC) and direct ethanol fuel cells (DEFC) to obtain the maximum power density with the response surface method using Program Design Expert 7.0.0. M A N U S C R I P T A C C E P T E D ACCEPTED MANUSCRIPTThree related independent variables, including operating temperature in the range of 30-70°C, alcohol flow rate in the range of 5-50 ml/min, and alcohol concentration in the range of 0.5-3 M, were covered. Nafion117 was used as an electrolyte and Pt-Ru and Pt were used as catalysts in anode and cathode, respectively. The effect of those variables on the maximum power density was illustrated in the form of quadratic models which predicted the appropriate operating conditions. The Nafion membrane was modified by adding mordenite (MOR) to improve its alcohol permeability. The result from response revealed that the higher operating temperatures and higher alcohol concentrations led to an increase in maximum power density, in both the DMFC and DEFC. The DMFC had a higher maximum power density and greater current than the DEFC had. This was because methanol was easier to oxidize than ethanol In addition, it was found that the MOR content of 1.47 wt% in the Nafion composite membrane reduced the alcohol permeability

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Section: Accepted Manuscriptmentioning

confidence: 99%

Application of response surface methodology to optimize direct alcohol fuel cell power density for greener energy production

Charoen

Prapainainar

Sureeyatanapas

et al. 2017

Journal of Cleaner Production

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“…This technology eliminates the use of ancillary units such as external condensers and heat exchangers used in conventional DMFC systems to recover water and recycle it to the anode. A comprehensive description of this technology is presented elsewhere [7], [8], [9]. Figure 1 shows the architecture of an open-cathode DMFC system.…”

Section: System Descriptionmentioning

confidence: 99%

“…Note that the number of entries in the output vector depends on the availability of hardware measurements, and hence the output-vector length changes when a sensor is added or removed from the DMFC system. Modeling details are documented in [10], while a steady-state versions of the model are given in [8], [9]. The linear dynamic state-space model of the DMFC system is expressed by the time-invariant structurė…”

Section: State-space Modelmentioning

confidence: 99%

Methanol concentration estimation in a direct methanol fuel cell system

Mudiraj

Crisalle

2014

2014 American Control Conference

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An inferential sensor based on state estimation techniques is proposed for measuring the methanol concentration in an open-cathode direct methanol fuel cell. The strategies considered include full-state and reduced-state Luenberger observers along with a proportional-integral observer. The estimators are designed using linear dynamics derived from a comprehensive nonlinear dynamic model of an experimental open-cathode direct methanol fuel cell. A representative simulation study is used to assess the performance of the estimation schemes deployed on both the linear and nonlinear dynamic models of the system. All three estimation methods are initially tuned to deliver adequate performance on the linear model. The simulation results show that the proportional-integral state observer outperforms the other designs when the dynamics are driven away from the linear regime. It is argued that the additional robustness of the proposed proportional-integral observer design holds significant promise for use as the basis for developing an effective inferential methanol composition sensor.

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“…At cathode, reduction reaction takes place where 6 protons and electrons react with atmospheric oxygen from air to produce water. In DEFC (Figure B), the oxidation reaction involves the chemical reaction of ethanol and water releasing 2 moles of carbon dioxide and 12 electrons . Thus, DEFC possesses to have higher power density when compared with DMFC.…”

Section: Introductionmentioning

confidence: 99%

A novel comprehensive procedure for determination of optimum operating conditions for cleaner energy production system

et al. 2018

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Summary Cleaner energy production system such as direct alcohol fuel cells (DAFCs) are considered as an alternative source for generating cleaner energy. Studies based on design of catalysts, electrodes design, proton exchange membrane, and flow field were conducted for improving its performance characteristic such as power density. However, the less focus was paid on determining the operating conditions considering the uncertainties that will result in an increase of power density of DAFCs. Therefore, the present work proposes a novel comprehensive procedure involving experimental study and evolutionary approach of genetic programming (GP) in formulation of robust power density models for DAFCs. Two uncertainties such as the selection of objective function and variations in measurement of operating conditions are incorporated in framework of GP. The power density models incorporate the formulation of new objective function in GP that will result in higher accuracy of the models. Experiments performed on DAFCs validate performance of the models. Simulation profiler is then generated for models to verify its robustness in uncertain operating conditions. The inferences on relationships between power density and operating conditions for DAFCs are made by surface analysis of the models.

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Comprehensive mass transport modeling technique for the cathode side of an open-cathode direct methanol fuel cell

Cited by 17 publications

References 40 publications

Application of response surface methodology to optimize direct alcohol fuel cell power density for greener energy production

Application of response surface methodology to optimize direct alcohol fuel cell power density for greener energy production

Methanol concentration estimation in a direct methanol fuel cell system

A novel comprehensive procedure for determination of optimum operating conditions for cleaner energy production system

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