Improved mass transfer using a pore former in cathode catalyst layer in the direct methanol fuel cell

Cho, Yoon-Hwan; Jung, Namgee; Kang, Yun Sik; Chung, Dong Young; Lim, Ju Wan; Choe, Heeman; Cho, Yong‐Hun; Sung, Yung‐Eun

doi:10.1016/j.ijhydene.2012.05.031

Cited by 40 publications

(24 citation statements)

References 31 publications

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“…Recently, there have been several technical issues for the commercialization of PEMFC including water management at the cathode in the membrane electrode assembly (MEA) 5 6 7 8 and resistance reduction of the electrolyte membrane 9 10 . To improve transport of water generated from electrochemical reaction at the cathode, research has been conducted on inserting meso/macro pore structures such as platinum inverse opal structure and pore formers into the electrode, which methods need chemical post-treatments 11 12 13 14 15 . Moreover, there have been attempts to reduce the resistance of an electrolyte membrane by lowering the thickness of the membrane.…”

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confidence: 99%

High-performance Fuel Cell with Stretched Catalyst-Coated Membrane: One-step Formation of Cracked Electrode

Kim

Ahn

Cho

et al. 2016

Sci Rep

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We have achieved performance enhancement of polymer electrolyte membrane fuel cell (PEMFC) though crack generation on its electrodes. It is the first attempt to enhance the performance of PEMFC by using cracks which are generally considered as defects. The pre-defined, cracked electrode was generated by stretching a catalyst-coated Nafion membrane. With the strain-stress property of the membrane that is unique in the aspect of plastic deformation, membrane electrolyte assembly (MEA) was successfully incorporated into the fuel cell. Cracked electrodes with the variation of strain were investigated and electrochemically evaluated. Remarkably, mechanical stretching of catalyst-coated Nafion membrane led to a decrease in membrane resistance and an improvement in mass transport, which resulted in enhanced device performance.

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confidence: 99%

High-performance Fuel Cell with Stretched Catalyst-Coated Membrane: One-step Formation of Cracked Electrode

Kim

Ahn

Cho

et al. 2016

Sci Rep

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“…As reactants and products are mainly transferred through macro-sized secondary pores, and the mass transfer of MEA in a single cell is dominated by these secondary pores 57 . For that reason, IO electrodes with ordered macropore structures show better performance and more effective water management in practical fuel cell devices.…”

Section: Resultsmentioning

confidence: 99%

Ordered macroporous platinum electrode and enhanced mass transfer in fuel cells using inverse opal structure

et al. 2013

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Three-dimensional, ordered macroporous materials such as inverse opal structures are attractive materials for various applications in electrochemical devices because of the benefits derived from their periodic structures: relatively large surface areas, large voidage, low tortuosity and interconnected macropores. However, a direct application of an inverse opal structure in membrane electrode assemblies has been considered impractical because of the limitations in fabrication routes including an unsuitable substrate. Here we report the demonstration of a single cell that maintains an inverse opal structure entirely within a membrane electrode assembly. Compared with the conventional catalyst slurry, an ink-based assembly, this modified assembly has a robust and integrated configuration of catalyst layers; therefore, the loss of catalyst particles can be minimized. Furthermore, the inverse-opalstructure electrode maintains an effective porosity, an enhanced performance, as well as an improved mass transfer and more effective water management, owing to its morphological advantages.

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“…Another barrier involved with the cathode is the flooding of the electrode structure from water being produced from the ORR . Much work has been done to mitigate these detriments . Another factor that can contribute to this that is unique to the DMFC and other liquid‐based PEMFCs is the electroosmotic drag of the water from the aqueous fuel solutions such as methanol or formic acid across the membrane from the anode‐side to the cathode.…”

Section: Introductionmentioning

confidence: 99%

Effect of the Cathode Catalyst Layer Thickness on the Performance in Direct Methanol Fuel Cells

Glass

Prakash

2019

Electroanalysis

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Catalyst deposition control is one of the overlooked areas of fuel cell fabrication and research that can affect the overall performance and cost of the fuel cell to manufacture for mass production. The effect of the different individual catalyst layer thicknesses and loadings of the cathode compartment of a direct methanol fuel cell (DMFC) was investigated. The drawdown method was performed at thicknesses varying from 1 mil to 8 mils with platinum loadings ranging from 0.25 mg cm−2 to 2.0 mg cm−2. The membrane electrode assemblies (MEAs) with thicker individual layers (8 mil and 4 mil) performed better overall compared to the ones prepared with thinner individual layers (1 mil). The power density maxima for the different loading levels followed an exponential decrease of platinum utilization at the higher loading levels. The painted MEAs tended to display the similar performance characteristics as the drawdown MEA layers closest to the thickness at the respective loadings.

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Improved mass transfer using a pore former in cathode catalyst layer in the direct methanol fuel cell

Cited by 40 publications

References 31 publications

High-performance Fuel Cell with Stretched Catalyst-Coated Membrane: One-step Formation of Cracked Electrode

High-performance Fuel Cell with Stretched Catalyst-Coated Membrane: One-step Formation of Cracked Electrode

Ordered macroporous platinum electrode and enhanced mass transfer in fuel cells using inverse opal structure

Effect of the Cathode Catalyst Layer Thickness on the Performance in Direct Methanol Fuel Cells

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