Transition Metal Chalcogenides for Oxygen Reduction Electrocatalysts in PEM Fuel Cells

Lee, Kunchan; Alonso‐Vante, Nicolas; Zhang, Jiujun

doi:10.1002/9783527664900.ch4

Cited by 10 publications

(1 citation statement)

References 50 publications

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“…Furthermore, it must be noted that for different electrocatalysts, the bottlenecks towards optimal MEA performance differ as well. For instance, non-noble electrocatalysts suffer from reactants mass transport issues as the catalyst layer is inevitably too thick due to the low active site density [20][21][22]. On the other hand, some catalysts with excellent RDE performance, for example, the 3M's nanostructured thin films (NSTF), suffer from flooding [17], i.e., the inability to remove products (water) from the catalyst layer.…”

Section: Introductionmentioning

confidence: 99%

Insight on Single Cell Proton Exchange Membrane Fuel Cell Performance of Pt-Cu/C Cathode

et al. 2019

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The oxygen reduction reaction (ORR) properties of a proprietary PtCu3/C alloy electrocatalyst produced on a multi-gram scale are characterized by the conventional rotating disc electrode (RDE) method and by constructing a membrane electrode assembly (MEA) proton exchange membrane (PEM) single cell. The PtCu3 nanoparticles become porous, enriched in Pt on the surface, and exhibit a high RDE activity. The single cell electrochemical study reveals that, contrary to most advanced catalysts, the high ORR activity can be transferred from the RDE to the MEA. In the latter case, at 0.9VIRfree, a mass activity of 0.53 A/mgPt, at a Pt electrode loading of 0.2 mg/cm2, is achieved. However, at high current density, oxygen transport becomes limited. This is proven by the analysis of polarization curves and electrochemical impedance spectroscopy (EIS) data with a Kulikovsky (physical) model. These indicate that this limitation is caused by the non-optimal microporosity of our catalyst, which hinders the mass transport of oxygen during ORR. Based on our prospective results, one can realistically plan for further efforts to bridge the gap between the RDE and MEA measurements completely and achieve high power densities for Pt-alloy electrocatalysts.

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Section: Introductionmentioning

confidence: 99%

Insight on Single Cell Proton Exchange Membrane Fuel Cell Performance of Pt-Cu/C Cathode

et al. 2019

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Platinfreie Nanomaterialien für die Sauerstoffreduktion

et al. 2015

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Der Ersatz von Platin (Pt) durch billigere, unedle Elemente in Elektrokatalysatoren für die Sauerstoffreduktionsreaktion (ORR) ist für die Entwicklung nachhaltiger, leistungsfähiger Brennstoffzellen zur Energieumwandlung von größtem Interesse. Platinfreie Materialien bergen jedoch eine Reihe von Herausforderungen, wie eine geringe intrinsische katalytische Aktivität, eine begrenzte Zahl aktiver Zentren und schlechte Stofftransporteigenschaften. Jüngste Fortschritte in den Materialwissenschaften und der Nanotechnologie ermöglichen nun ein rationales Design von neuen Materialien mit unedlen Elementen mit optimierter Zusammensetzung und präziser Nanostruktur. Dies eröffnet neue Möglichkeiten zur Verbesserung der ORR‐Leistung auf molekularer Ebene. Dieser Aufsatz beleuchtet die aktuellen Durchbrüche bei der Entwicklung von Nanokatalysatoren für die ORR.

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Earth‐Abundant Nanomaterials for Oxygen Reduction

et al. 2015

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Replacing the rare and precious platinum (Pt) electrocatalysts with earth-abundant materials for promoting the oxygen reduction reaction (ORR) at the cathode of fuel cells is of great interest in developing high-performance sustainable energy devices. However, the challenging issues associated with non-Pt materials are still their low intrinsic catalytic activity, limited active sites, and the poor mass transport properties. Recent advances in material sciences and nanotechnology enable rational design of new earth-abundant materials with optimized composition and fine nanostructure, providing new opportunities for enhancing ORR performance at the molecular level. This Review highlights recent breakthroughs in engineering nanocatalysts based on the earth-abundant materials for boosting ORR.

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Transition Metal Chalcogenides for Oxygen Reduction Electrocatalysts in PEM Fuel Cells

Cited by 10 publications

References 50 publications

Insight on Single Cell Proton Exchange Membrane Fuel Cell Performance of Pt-Cu/C Cathode

Insight on Single Cell Proton Exchange Membrane Fuel Cell Performance of Pt-Cu/C Cathode

Platinfreie Nanomaterialien für die Sauerstoffreduktion

Earth‐Abundant Nanomaterials for Oxygen Reduction

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