Cell performance modeling of direct methanol fuel cells using proton-exchange solid electrolytes: Effective reactant diffusion coefficients in porous diffusion layers

Wang, Boyan; Lin, Hun-Kai; Liu, Nai-Yuan; Mahesh, K.P.O.; Lue, Shingjiang Jessie

doi:10.1016/j.jpowsour.2012.11.029

Cited by 23 publications

(12 citation statements)

References 38 publications

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“…The incorporation of the nanofillers in the QPVA film resulted in physical hindrance, blocking the passage of fuel feed and reducing the alcohol crossover [58,59]. This effect is advantageous for the polymeric electrolyte membrane in improving cell performance of DAMFCs [60].…”

Section: Nanocomposite Membrane Characterizationsmentioning

confidence: 99%

Surfactant-Assisted Perovskite Nanofillers Incorporated in Quaternized Poly (Vinyl Alcohol) Composite Membrane as an Effective Hydroxide-Conducting Electrolyte

Kumar

et al. 2017

Energies

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Perovskite LaFeO 3 nanofillers (0.1%) are incorporated into a quaternized poly(vinyl alcohol) (QPVA) matrix for use as hydroxide-conducting membranes in direct alkaline methanol fuel cells (DAMFCs). The as-synthesized LaFeO 3 nanofillers are amorphous and functionalized with cetyltrimethylammonium bromide (CTAB) surfactant. The annealed LaFeO 3 nanofillers are crystalline without CTAB. The QPVA/CTAB-coated LaFeO 3 composite membrane shows a defect-free structure while the QPVA/annealed LaFeO 3 film has voids at the interfaces between the soft polymer and rigid nanofillers. The QPVA/CTAB-coated LaFeO 3 composite has lower methanol permeability and higher ionic conductivity than the pure QPVA and QPVA/annealed LaFeO 3 films. We suggest that the CTAB-coated LaFeO 3 provides three functions to the polymeric composite: increasing polymer free volume, ammonium group contributor, and plasticizer to enhance the interfacial compatibility. The composite containing CTAB-coated LaFeO 3 results in superior cell performance. A maximum power density of 272 mW cm −2 is achieved, which is among the highest power outputs reported for DAMFCs in the literature.

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Section: Nanocomposite Membrane Characterizationsmentioning

confidence: 99%

Surfactant-Assisted Perovskite Nanofillers Incorporated in Quaternized Poly (Vinyl Alcohol) Composite Membrane as an Effective Hydroxide-Conducting Electrolyte

Kumar

et al. 2017

Energies

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“…The modeling of the oxygen diffusion coefficient into the cathode is described in [6] and the details are described in the supplementary information.…”

Section: Cathode Overpotentialmentioning

confidence: 99%

“…The DFAFCs facilitates lower crossover flux through the electrolyte membrane than that of methanol, faster electrochemical kinetics due to the smaller molecular size than methanol, and non-toxicity [4]. In addition, it has many advantages, such as a low emission of pollutants, high energy density, and the aptitude to utilize liquid fuel that is more readily stored and transported than hydrogen fuel [5,6]. Moreover, a DFAFC has a higher theoretical cell potential (1.48 V), exhibiting a higher voltage output compared to that in a methanol (1.21 V) and gaseous hydrogen cell (1.23 V), respectively [5,7].…”

Section: Introductionmentioning

confidence: 99%

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Experimental and One-Dimensional Mathematical Modeling of Different Operating Parameters in Direct Formic Acid Fuel Cells

et al. 2017

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Abstract:The purpose of this work is to develop a one-dimensional mathematical model for predicting the cell performance of a direct formic acid fuel cell and compare this with experimental results. The predicted model can be applied to direct formic acid fuel cells operated with different formic acid concentrations, temperatures, and with various electrolytes. Tafel kinetics at the electrodes, thermodynamic equations for formic acid solutions, and the mass-transport parameters of the reactants are used to predict the effective diffusion coefficients of the reactants (oxygen and formic acid) in the porous gas diffusion layers and the associated limiting current densities to ensure the accuracy of the model. This model allows us to estimate fuel cell polarization curves for a wide range of operating conditions. Furthermore, the model is validated with experimental results from operating at 1-5 M of formic acid feed at 30-80 • C, and with Nafion-117 and silane-crosslinked sulfonated poly(styrene-ethylene/butylene-styrene) (sSEBS) membrane electrolytes reinforced in porous polytetrafluoroethylene (PTFE). The cell potential and power densities of experimental outcomes in direct formic acid fuel cells can be adequately predicted using the developed model.

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“…The experimental setup was illustrated in our previous work [42,56,57]. The fuel (1 M, 2 M and 4 M methanol in 6 M KOH) was maintained at a predetermined temperature in a thermostatic chamber and recirculated through the anode using a metering pump at a flow rate of 5 mL·min −1 .…”

Section: Cell Performance Measurementmentioning

confidence: 99%

Reorientation of Magnetic Graphene Oxide Nanosheets in Crosslinked Quaternized Polyvinyl Alcohol as Effective Solid Electrolyte

Lin

Shih

et al. 2016

Energies

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This work aims to clarify the effect of magnetic graphene oxide (GO) reorientation in a polymer matrix on the ionic conduction and methanol barrier properties of nanocomposite membrane electrolytes. Magnetic iron oxide (Fe 3 O 4 ) nanoparticles were prepared and dispersed on GO nanosheets (GO-Fe 3 O 4 ). The magnetic GO-Fe 3 O 4 was imbedded into a quaternized polyvinyl alcohol (QPVA) matrix and crosslinked (CL-) with glutaraldehyde (GA) to obtain a polymeric nanocomposite. A magnetic field was applied in the through-plane direction during the drying and film formation steps. The CL-QPVA/GO-Fe 3 O 4 nanocomposite membranes were doped with an alkali to obtain hydroxide-conducting electrolytes for direct methanol alkaline fuel cell (DMAFC) applications. The magnetic field-reoriented CL-QPVA/GO-Fe 3 O 4 electrolyte demonstrated higher conductivity and lower methanol permeability than the unoriented CL-QPVA/GO-Fe 3 O 4 membrane or the CL-QPVA film. The reoriented CL-QPVA/GO-Fe 3 O 4 nanocomposite was used as the electrolyte in a DMAFC and resulted in a maximum power density of 55.4 mW·cm −2 at 60 • C, which is 73.7% higher than that of the composite without the magnetic field treatment (31.9 mW·cm −2 ). In contrast, the DMAFC using the CL-QPVA electrolyte generated only 22.4 mW·cm −2 . This research proved the surprising benefits of magnetic-field-assisted orientation of GO-Fe 3 O 4 in facilitating the ion conduction of a polymeric electrolyte.

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Cell performance modeling of direct methanol fuel cells using proton-exchange solid electrolytes: Effective reactant diffusion coefficients in porous diffusion layers

Cited by 23 publications

References 38 publications

Surfactant-Assisted Perovskite Nanofillers Incorporated in Quaternized Poly (Vinyl Alcohol) Composite Membrane as an Effective Hydroxide-Conducting Electrolyte

Surfactant-Assisted Perovskite Nanofillers Incorporated in Quaternized Poly (Vinyl Alcohol) Composite Membrane as an Effective Hydroxide-Conducting Electrolyte

Experimental and One-Dimensional Mathematical Modeling of Different Operating Parameters in Direct Formic Acid Fuel Cells

Reorientation of Magnetic Graphene Oxide Nanosheets in Crosslinked Quaternized Polyvinyl Alcohol as Effective Solid Electrolyte

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