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Performance and Degradation of BaCoO3 based Perovskite Catalysts during Oxygen Evolution in Alkaline Water Electrolysis

Performance and Degradation of BaCoO3 based Perovskite Catalysts during Oxygen Evolution in Alkaline Water Electrolysis

          
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About the Book

Die Umwandlung und Speicherung erneuerbarer Energie und Technologien zur Vermeidung von zukunftigen Treibhausgasemissionen sind die großten Herausforderungen zum Aufbau einer nachhaltig wirtschaftenden Gesellschaft. Wasserstoff als Energietrager wird in der zukunftigen Entwicklung des Energiemarktes eine entscheidende Rolle spielen. Die alkalische Wasserelektrolyse ist eine einfache und effiziente Methode zur Herstellung von Wasserstoff, welche das Potential hat, ihren okonomisch sinnvollen Einsatz in zukunftigen Projekten zur Energieumwandlung und -speicherung im MW-Bereich zu finden. Neben Gesetzgebung und Anlagenauslegung fur alkalische Elektrolyseure ist dafur vor allem die Effizienz des chemischen Prozesses ausschlaggebend. Die chemische Reaktion der alkalischen Wasserelektrolyse wird von der vergleichsweise langsamen Sauerstoffentwicklungsreaktion an der Anode gehemmt. Katalysatormaterialien, welche die anodische Reaktion katalytisch beschleunigen, gleichzeitig gunstig in der Herstellung sind und lange Lebenszeiten aufweisen, sind gesucht. Oxydische Materialien, vor allem Perowskite, sind bekannt fur ihre Fahigkeit zur Katalyse der Sauerstoffentwicklungsreaktion. Es wurde jedoch beobachtet, dass perowskitische Katalysatoren ihre Kristallinitat uber die Einsatzdauer verlieren konnen und dabei auch teilweise Kationen aus dem Gitter verlieren. Im Gegensatz zu bereits vorherrschenden Messpraktiken zeigt diese Arbeit anhand von BaCoO3-d basierten Katalysatoren, beispielsweise Pr0.2Ba0.8CoO3-d (PBCO) und Ba0.5Sr0.5Co0.5Fe0.5O3-d (BSCF) Dunnschichten, dass die Degradation von Perowskiten bei einsatzrelevanten Temperaturen (80 °C) massiv voranschreitet und zu einem Masseverlust in der gesamten Dunnschicht fuhrt, der auch eine komplette Amorphisierung der Dunnschicht mit sich bringt. Fur die Aufklarung der Vorgange wird zunachst mithilfe hochenergetischer Rontgenbeugung und resonanter Rontgenbeugung in Kombination mit Rontgenabsorptionsspektroskopie eine strukturelle Charakterisierung der PrxBa1-xCoO3-d Reihe durchgefuhrt, bei der sowohl ein Ubergang von hexagonaler zu kubischer Struktur, als auch ein Ubergang von Sauerstoff-Leerstellen-Ordnung zu Kationen-Ordnung beobachtet werden kann. Die Charakterisierung der Stabilitat und Lebensdauer der Perowskit-Elektrokatalysatoren wird durch einen eigens dafur entwickelten Test umgesetzt (End of Service Life Test, ESLT), der den Masseverlust sowie die Veranderung der elektrochemischen Eigenschaften uber die Gesamtle


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Product Details
  • ISBN-13: 9783735750617
  • Publisher: Books on Demand
  • Binding: Paperback
  • Language: German
  • Width: 324 mm
  • ISBN-10: 3735750613
  • Publisher Date: 5/20/2019
  • Height: 210 mm
  • Weight: 11 gr

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Performance and Degradation of BaCoO3 based Perovskite Catalysts during Oxygen Evolution in Alkaline Water Electrolysis
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