In situ measurement of the oxygen diffusion coefficient in the cathode catalyst layer of a direct methanol fuel cell

Wippermann, Klaus; Klafki, K.; Kulikovsky, Andrei

doi:10.1016/j.electacta.2014.06.164

Cited by 6 publications

(2 citation statements)

References 16 publications

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“…While the precise co-relation between permeability and MCO is complicated, certain variables such as the thickness of membrane [85] and methanol feed concentration [86] impact crossover in definite directions, i.e., for greater methanol concentration or thinner membrane, the crossover rates are higher [87]. In addition to permeability, the co-efficient of diffusion and solubility properties are often reported [88]. It is essential to measure these concepts and connect them to the MCO fluxes of operational DMFCs at this phase.…”

Section: Methanol Crossovermentioning

confidence: 99%

A Critical Assessment on Functional Attributes and Degradation Mechanism of Membrane Electrode Assembly Components in Direct Methanol Fuel Cells

2021

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Direct methanol fuel cells (DMFC) are typically a subset of polymer electrolyte membrane fuel cells (PEMFC) that possess benefits such as fuel flexibility, reduction in plant balance, and benign operation. Due to their benefits, DMFCs could play a substantial role in the future, specifically in replacing Li-ion batteries for portable and military applications. However, the critical concern with DMFCs is the degradation and inadequate reliability that affect the overall value chain and can potentially impede the commercialization of DMFCs. As a consequence, a reliability assessment can provide more insight into a DMFC component’s attributes. The membrane electrode assembly (MEA) is the integral component of the DMFC stack. A comprehensive understanding of its functional attributes and degradation mechanism plays a significant role in its commercialization. The methanol crossover through the membrane, carbon monoxide poisoning, high anode polarization by methanol oxidation, and operating parameters such as temperature, humidity, and others are significant contributions to MEA degradation. In addition, inadequate reliability of the MEA impacts the failure mechanism of DMFC, resulting in poor efficiency. Consequently, this paper provides a comprehensive assessment of several factors leading to the MEA degradation mechanism in order to develop a holistic understanding.

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Section: Methanol Crossovermentioning

confidence: 99%

A Critical Assessment on Functional Attributes and Degradation Mechanism of Membrane Electrode Assembly Components in Direct Methanol Fuel Cells

2021

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“…In such methods, impedance spectra of the cell are measured for the same cell current but different oxygen concentrations in the cathode channels. Based on the difference between resistivity of the cell for different concentrations, oxygen diffusivity can be calculated (2)(3). The accuracy of such diffusivity measurements is highly influenced by the model relating the impedance of CCL to its diffusivity (4).…”

Section: Introductionmentioning

confidence: 99%

Accurate Ex-situ Measurements of PEM Fuel Cells Catalyst Layer Dry Diffusivity

et al. 2015

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Polymer electrolyte membrane fuel cells (PEMFC) efficiently convert the reaction energy of hydrogen and oxygen to electricity, water and heat. The oxygen reduction reaction occurs in composite nanostructured catalyst layers (CL) formed from Pt nanoparticles supported on a network of carbon particle agglomerates. Oxygen reaches the reaction site through diffusion. Understanding the diffusion properties of CL is vital to proper design and operation of CL and PEMFC. Measuring the diffusivity of thin porous layers is challenging, as is selecting a suitable substrate and appropriate CL coating procedures. In this work, CL is coated on 70 μm thick hydrophobic porous polymer substrates with a Mayer bar coater. Several samples are prepared and their thickness are measured accurately. The diffusivity of the CL and the substrate are measured using a dry diffusivity test bed and the resulting CL-diffusivity values are determined for different Pt loadings.

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Multiscale structures in particle–fluid systems: Characterization, modeling, and simulation

Chang

et al. 2019

Chemical Engineering Science

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In situ measurement of the oxygen diffusion coefficient in the cathode catalyst layer of a direct methanol fuel cell

Cited by 6 publications

References 16 publications

A Critical Assessment on Functional Attributes and Degradation Mechanism of Membrane Electrode Assembly Components in Direct Methanol Fuel Cells

A Critical Assessment on Functional Attributes and Degradation Mechanism of Membrane Electrode Assembly Components in Direct Methanol Fuel Cells

Accurate Ex-situ Measurements of PEM Fuel Cells Catalyst Layer Dry Diffusivity

Multiscale structures in particle–fluid systems: Characterization, modeling, and simulation

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