Voltammetric Characterization Methods for the PEM Evaluation of Catalysts

Gouws, Shawn

doi:10.5772/48499

Cited by 6 publications

(5 citation statements)

References 24 publications

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“…As shown in Fig. 4a , comparable electrochemical active surface area (ECSA) was observed from the CV measurement 23 , which indicates that the generated crack doesn’t affect the area of tri-phase boundary during the operation. When the EIS data were fitted and calculated by the equivalent circuit ( Fig.…”

Section: Resultssupporting

confidence: 58%

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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Section: Resultssupporting

confidence: 58%

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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“…In addition, CV analysis was conducted to verify the effect of extended interfacial area between the patterned film and the catalyst layer. 40,41 Figure 5a shows CV curves for cathode part in a single cell of the multiscale-patterned MEA and the conventional one. From the hydrogen adsorption/desorption area in each CV curve, the ESA were calculated by following equation.…”

Section: Resultsmentioning

confidence: 99%

“…In addition, CV analysis was conducted to verify the effect of extended interfacial area between the patterned film and the catalyst layer. , Figure a shows CV curves for cathode part in a single cell of the multiscale-patterned MEA and the conventional one. From the hydrogen adsorption/desorption area in each CV curve, the ESA were calculated by following equation. In the above equation, q Pt is hydrogen absorption (or desorption) charge density, which can be obtained from the CV curves, and Γ is the charge required to reduce a monolayer of protons on Pt (Γ = 210 μC cm –2 ).…”

Section: Results and Discussionmentioning

confidence: 99%

Facile Multiscale Patterning by Creep-Assisted Sequential Imprinting and Fuel Cell Application

Jang¹,

Kim

Kang

et al. 2016

ACS Appl. Mater. Interfaces

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The capability of fabricating multiscale structures with desired morphology and incorporating them into engineering applications is key to realizing technological breakthroughs by employing the benefits from both microscale and nanoscale morphology simultaneously. Here, we developed a facile patterning method to fabricate multiscale hierarchical structures by a novel approach called creep-assisted sequential imprinting. In this work, nanopatterning was first carried out by thermal imprint lithography above the glass transition temperature (Tg) of a polymer film, and then followed by creep-assisted imprinting with micropatterns based on the mechanical deformation of the polymer film under the relatively long-term exposure to mechanical stress at temperatures below the Tg of the polymer. The fabricated multiscale arrays exhibited excellent pattern uniformity over large areas. To demonstrate the usage of multiscale architectures, we incorporated the multiscale Nafion films into polymer electrolyte membrane fuel cell, and this device showed more than 10% higher performance than the conventional one. The enhancement was attributed to the decrease in mass transport resistance because of unique cone-shape morphology by creep-recovery effects and the increase in interfacial surface area between Nafion film and electrocatalyst layer.

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“…To quantitatively explain the effect of reduced membrane resistance and increased active surface area, both electrochemical impedance spectroscopy 39 and cyclic voltammetry (CV) 40 were carried out ( Fig. 5 ; Supplementary Table 3 ; Supplementary Methods ).…”

Section: Discussionmentioning

confidence: 99%

Multiplex lithography for multilevel multiscale architectures and its application to polymer electrolyte membrane fuel cell

et al. 2015

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The production of multiscale architectures is of significant interest in materials science, and the integration of those structures could provide a breakthrough for various applications. Here we report a simple yet versatile strategy that allows for the LEGO-like integrations of microscale membranes by quantitatively controlling the oxygen inhibition effects of ultraviolet-curable materials, leading to multilevel multiscale architectures. The spatial control of oxygen concentration induces different curing contrasts in a resin allowing the selective imprinting and bonding at different sides of a membrane, which enables LEGO-like integration together with the multiscale pattern formation. Utilizing the method, the multilevel multiscale Nafion membranes are prepared and applied to polymer electrolyte membrane fuel cell. Our multiscale membrane fuel cell demonstrates significant enhancement of performance while ensuring mechanical robustness. The performance enhancement is caused by the combined effect of the decrease of membrane resistance and the increase of the electrochemical active surface area.

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Voltammetric Characterization Methods for the PEM Evaluation of Catalysts

Cited by 6 publications

References 24 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

Facile Multiscale Patterning by Creep-Assisted Sequential Imprinting and Fuel Cell Application

Multiplex lithography for multilevel multiscale architectures and its application to polymer electrolyte membrane fuel cell

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