Effect of cathode binder IEC on kinetic and transport losses in all-SPEEK MEAs

Sambandam, Satheesh; Ramani, Vijay

doi:10.1016/j.electacta.2008.04.012

Cited by 38 publications

(45 citation statements)

References 41 publications

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“…kinetic, Ohmic and mass transport losses) using methods summarized in the literature. 9,10 The contributions of two sources of Ohmic polarization: (i) membrane + contact resistance, and (ii) electrode resistance were estimated.…”

Section: Other Electrochemical Characterization On Measmentioning

confidence: 99%

Platinum-carbon black-titanium dioxide nanocomposite electrocatalysts for fuel cell applications

et al. 2009

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New-generation Pt/C-TiO 2 nanocomposite electrocatalysts for fuel cells, prepared by a heterogeneous photocatalytic method, have been characterized using techniques such as cyclic voltammetry, rotating disk electrode (RDE) voltammetry, and electrochemical impedance spectroscopy (EIS). Importantly, galvanostatic data confirm the superior stability of these materials against corrosion under anodic polarization conditions relative to commercial benchmark fuel cell electrocatalysts. EIS spectra from ETEK 5, SIDCAT 405 and SIDCAT 410 membrane electrode assemblies (MEAs) were fit to a Randles equivalent circuit with a Warburg element to show the presence of O 2 transport limitation arising from the use of thicker electrodes (lower Pt loading on carbon). The use of a constant phase element (CPE) instead of pure capacitor was justified from the fit procedure as CPE represents the porous electrode system more precisely with its distributive elements. EIS spectra from Tanaka, SIDCAT 451 and SIDCAT 452 MEAs (thinner electrodes) were fit to a Randles circuit with a pure capacitor and no Warburg element. The use of a transmission line model for fitting these data independently provided information about the catalyst layer resistance while all other parameters matched well with that of the Randles circuit. The effective proton transport in cathodes was quantified using polarization data for both classes of MEAs. Trends in the previously reported performance of MEAs prepared using these electrocatalysts were justified based on the relative contributions of kinetic, Ohmic and mass transfer losses to the overall overpotential, which in turn were estimated from impedance and polarization data analyses.

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Section: Other Electrochemical Characterization On Measmentioning

confidence: 99%

Platinum-carbon black-titanium dioxide nanocomposite electrocatalysts for fuel cell applications

et al. 2009

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“…These include sulfonated poly(etherketones), [56][57][58][59][60][61][62][63][64][65][66] polysulfones (PSU), 67,68 [74][75][76][77] and polyphosphazene. 78 Representative structures of these families of polymer are presented in Fig.…”

Section: Alternative Proton Conducting Polymers For Use In Catalyst Lmentioning

confidence: 99%

Hydrocarbon proton conducting polymers for fuel cell catalyst layers

Péron

Shi

Holdcroft

2011

Energy Environ. Sci.

103

115

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Proton exchange membrane fuel cells (PEMFCs) employing proton conducting membranes are promising power sources for automotive applications. Perfluorosulfonic acid (PFSA) ionomer represents the state-of-the-art polymer used in both the membrane and catalyst layer to facilitate the transport of protons. However, PFSA ionomer is recognized as having significant drawbacks for largescale commercialization, which include the high cost of synthesis and use of fluorine-based chemistry. According to published research much effort has been directed to the synthesis and study of non-PFSA electrolyte membranes, commonly referred to as hydrocarbon membranes, which has led to optimism that the less expensive proton conducting membranes will be available in the not-so-distant future. Equally important, however, is the replacement of PFSA ionomer in the catalyst layer, but in contrast to membranes, studies of catalyst layers that incorporate a hydrocarbon polyelectrolyte are relatively sparse and have not been reviewed in the open literature; despite the knowledge that hydrocarbon polyelectrolytes in the catalyst layer generally lead to a decrease in electrochemical fuel cell kinetics and mass transport. This review highlights the role of the solid polymer electrolyte in catalyst layers on pertinent parameters associated with fuel cell performance, and focuses on the effect of replacing perfluorosulfonic acid ionomer with hydrocarbon polyelectrolytes. Collectively, this review aims to provide a better understanding of factors that have hindered the transition from PFSA to non-PFSA based catalyst layers.

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“…The development of new ionomers to replace Nafion as a membrane has led to the incorporation of new ionomers in the catalyst layer. The influence of parameters such as ion exchange capacity and ionomer content of the catalyst layer has been previously reported for LSC-PFSA [8,18,19] and for several non-perfluorinated polymers, examples of which include sulfonated polyetherketones [20][21][22][23][24], polyimides [25], polybenzimidazoles [26], sulfonated polysulfones and polyethersulfones [27][28][29].…”

Section: Introductionmentioning

confidence: 99%

Fuel cell catalyst layers containing short-side-chain perfluorosulfonic acid ionomers

Péron

Edwards

Haldane

et al. 2011

Journal of Power Sources

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Porous catalyst layers (CLs) containing short-side-chain (SSC) perfluorosulfonic acid (PFSA) ionomers of different ion exchange capacity (IEC: 1.3, 1.4 and 1.5 meq g −1 ) were deposited onto Nafion 211 to form catalyst-coated membranes. The porosity of SSC-PFSA-based CLs is larger than Nafion-CL analogues. CLs incorporating SSC ionomer extend the current density of fuel cell polarization curves at elevated temperature and lower relative humidity compared to those based on long-side chain PFSA (e.g., Nafion)-based CLs. Fuel cell polarization performance was greatly improved at 110• C and 30% relative humidity (RH) when SSC PFSI was incorporated into the catalyst layer.Crown

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Effect of cathode binder IEC on kinetic and transport losses in all-SPEEK MEAs

Cited by 38 publications

References 41 publications

Platinum-carbon black-titanium dioxide nanocomposite electrocatalysts for fuel cell applications

Platinum-carbon black-titanium dioxide nanocomposite electrocatalysts for fuel cell applications

Hydrocarbon proton conducting polymers for fuel cell catalyst layers

Fuel cell catalyst layers containing short-side-chain perfluorosulfonic acid ionomers

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