The development of redox stable oxide perovskite – based electrodes for cost-effective symmetric solid oxide fuel cells (SOFCs) that can work at intermediate temperatures and compete with state-of-the-art cathodes and...
Isolated active sites have great potential to be highly efficient and stable in heterogeneous catalysis, while enabling low costs due to the low transition metal content. Herein, we present results on the synthesis, first catalytic trials, and characterization of the Ga9Rh2 phase and the hitherto not-studied Ga3Rh phase. We used XRD and TEM for structural characterization, and with XPS, EDX we accessed the chemical composition and electronic structure of the intermetallic compounds. In combination with catalytic tests of these phases in the challenging propane dehydrogenation and by DFT calculations, we obtain a comprehensive picture of these novel catalyst materials. Their specific crystallographic structure leads to isolated Rhodium sites, which is proposed to be the decisive factor for the catalytic properties of the systems.
Zinn ist der Top-Favorit fürden Ersatz von giftigem Blei in Perowskit-Solarzellen. Allerdings kommt es dabei verstärkt zu der unerwünschten Oxidation von Sn II zu Sn IV .Die herkçmmlichen Verfahren verwenden SnF 2 in der Perowskit-Vorläuferlçsung,u md ie Bildung von Sn IV zu verhindern. Dennochb leibt der Wirkmechanismus des Additivs unklar. Um diesen eingehender zu erläutern, untersuchen wir die Fluoridchemie in Zinn-Halogenid-Perowskiten mit einander ergänzenden Analyseverfahren. NMR-Spektroskopie der Vorläuferlçsung offenbart eine stark bevorzugte Affinitätd er Fluoridanionen fürS n IV gegenüber Sn II ,w odurchd ieses selektiv als SnF 4 komplexiert wird.H arte Rçntgenphotoelektronenspektroskopie an Dünnschichten zeigt die geringere Bereitschaft von SnF 4 gegenüber SnI 4 ,i nd ie Perowskit-Struktur eingebaut zu werden und verhindert somit den Einschluss von Sn IV in der Dünnschicht. Abschließend offenbart Rçntgen-Kleinwinkelstreuung den starken Einfluss vom Fluorid auf die kolloidale Chemie der Vorläuferlçsungen, der sich direkt auf die darauffolgende Kristallisation auswirkt.
The crystallization of tin‐based perovskites is improved thanks to the fluoride in SnF2. The anion of this typical additive is responsible for a more homogeneous nucleation in solution‐processed perovskite thin film formation. In addition, fluoride selectively complexes SnIV and prevents its incorporation into the perovskite structure, as reported by Jorge Pascual, Antonio Abate, and co‐workers in their Research Article on page 21583.
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