Analysis of the effect of catalyst layer thickness on the performance and durability of platinum group metal-free catalysts for polymer electrolyte membrane fuel cells

Baricci, Andrea; Bisello, Andrea; Serov, Alexey; Odgaard, Madeleine; Atanassov, Plamen; Casalegno, Andrea

doi:10.1039/c9se00252a

Cited by 34 publications

(22 citation statements)

References 42 publications

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“…The curvature of the Nyquist plot suggests that the catalytic activity of both the OER and HER catalysts has a great effect at the lower concentrations. The ion transport within the catalyst layer and AEM may be associated with an increase in ohmic resistance and charge transfer resistance at lower KOH concentration 44 .…”

Section: Discussionmentioning

confidence: 99%

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Comprehensive impedance investigation of low-cost anion exchange membrane electrolysis for large-scale hydrogen production

Vincent

Lee

Kim

2021

Sci Rep

102

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Anion exchange membrane (AEM) electrolysis is a promising solution for large-scale hydrogen production from renewable energy resources. However, the performance of AEM electrolysis is still lower than what can be achieved with conventional technologies. The performance of AEM electrolysis is limited by integral components of the membrane electrode assembly and the reaction kinetics, which can be measured by ohmic and charge transfer resistances. We here investigate and then quantify the contributions of the ohmic and charge transfer resistances, and the rate-determining steps, involved in AEM electrolysis by using electrochemical impedance spectroscopy analysis. The factors that have an effect on the performance, such as voltage, flow rate, temperature and concentration, were studied at 1.5 and 1.9 V. Increased voltage, flow rate, temperature and concentration of the electrolyte strongly enhanced the anodic activity. We observed that here the anodic reaction offered a greater contribution to the overpotential than the cathode did.

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Section: Discussionmentioning

confidence: 99%

“…Long-term stability is a fundamental requirement of any electrolyser. There are several MEA combinations that exhibit high performance but they have failed, due to a lack of stability 12,44 . www.nature.com/scientificreports/…”

Section: Effect Of Koh Concentration On Performance and Resistances mentioning

confidence: 99%

Comprehensive impedance investigation of low-cost anion exchange membrane electrolysis for large-scale hydrogen production

Vincent

Lee

Kim

2021

Sci Rep

102

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“…These methods are based on the measurement of the probe's resistivity during the application of electrical or ionic current. Electrochemical impedance spectroscopy (EIS) is not only used for ex situ measurements of material characterisation or single parts of the fuel cell, but can also be applied for in situ measurements of the fuel cell or whole stack [166][167][168]. Rezaei Niya and Hoorfar [167] reviewed the application of EIS for in situ measurements for PEM fuel cell systems.…”

Section: Ionic Conductivitymentioning

confidence: 99%

“…The impedance Z is the ratio of the oscillating voltageŨ and current densityj and is defined as a complex number. A negative sign is required to be consistent with the definition of a positive current [168].…”

Section: Ionic Conductivitymentioning

confidence: 99%

Modelling Methods and Validation Techniques for CFD Simulations of PEM Fuel Cells

et al. 2021

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The large-scale adoption of fuel cells system for sustainable power generation will require the combined use of both multidimensional models and of dedicated testing techniques, in order to evolve the current technology beyond its present status. This requires an unprecedented understanding of concurrent and interacting fluid dynamics, material and electrochemical processes. In this review article, Polymer Electrolyte Membrane Fuel Cells (PEMFC) are analysed. In the first part, the most common approaches for multi-phase/multi-physics modelling are presented in their governing equations, inherent limitations and accurate materials characterisation for diffusion layers, membrane and catalyst layers. This provides a thorough overview of key aspects to be included in multidimensional CFD models. In the second part, advanced diagnostic techniques are surveyed, indicating testing practices to accurately characterise the cell operation. These can be used to validate models, complementing the conventional observation of the current–voltage curve with key operating parameters, thus defining a joint modelling/testing environment. The two sections complement each other in portraying a unified framework of interrelated physical/chemical processes, laying the foundation of a robust and complete understanding of PEMFC. This is needed to advance the current technology and to consciously use the ever-growing availability of computational resources in the next future.

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“…Similar confinement effects were invoked to explain why the apparent 4e À /2e À selectivity in ORR rises with the thickness of the catalytic layer. 65 Thicker layers may confine the peroxide intermediate in the inter-particle space, allowing it to complete its reactions. The pore-confinement mechanism can explain how morphology governs ORR activity across the series (Fig.…”

Section: View Article Onlinementioning

confidence: 99%

Understanding the self-templating of hierarchically porous carbon electrocatalysts using Group 2 coordination polymers

et al. 2020

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Analysis of the effect of catalyst layer thickness on the performance and durability of platinum group metal-free catalysts for polymer electrolyte membrane fuel cells

Abstract: A simple approach based on electrochemical impedance spectroscopy measurement is adopted to elucidate the effect of mixed ion and electron transport limitations during materials aging in platinum group metal-free catalysts for PEMFC.

Cited by 34 publications

References 42 publications

Comprehensive impedance investigation of low-cost anion exchange membrane electrolysis for large-scale hydrogen production

Comprehensive impedance investigation of low-cost anion exchange membrane electrolysis for large-scale hydrogen production

Modelling Methods and Validation Techniques for CFD Simulations of PEM Fuel Cells

Understanding the self-templating of hierarchically porous carbon electrocatalysts using Group 2 coordination polymers

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