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Water Oxidation over Au-Pd/TiO$_2$ as a Substitute for Iridium-Based Catalysts

Wahab, Khaja; Idriss, Hicham 1
1 Institut für Funktionelle Grenzflächen (IFG), Karlsruher Institut für Technologie (KIT)

Abstract:

Water oxidation is one of the most important reactions needed for a transition to a green economy. The reaction relies on extracting electrons from oxygen anions and is commonly studied using homogenous catalysts based on Ru or Ir metals. Because of Ir scarcity and its relative instability in acidic environments, metals to replace it are sought after. In this study, we have synthesized Au-Pd-based catalysts deposited on TiO$_2$ with different ratios in order to mimic IrO$_2$ valence orbitals (Ir5d) by the hybrid valence orbitals of Au5d and Pd4d and compared their heterogeneous catalytic activity for the evolution of O$_2$ from water in the presence of cerium ammonium nitrate (CAN). Au-Pd-based catalysts were found to be active at a particular nominal atomic ratio. At an atomic ratio of 1 Au to 2 Pd and 1 Au to 3 Pd, the catalysts were active and stable for oxygen production from water. Long-term runs up to 20,000 min still showed the expected stoichiometry between O$_2$ production and CAN consumption (1 to 4). However, catalysts with a reverse ratio were not active. Also, the monometallic catalysts were found to be not active for the reaction. ... mehr


Verlagsausgabe §
DOI: 10.5445/IR/1000168199
Veröffentlicht am 08.02.2024
Originalveröffentlichung
DOI: 10.3390/catal14010087
Scopus
Zitationen: 1
Web of Science
Zitationen: 1
Dimensions
Zitationen: 1
Cover der Publikation
Zugehörige Institution(en) am KIT Institut für Funktionelle Grenzflächen (IFG)
Publikationstyp Zeitschriftenaufsatz
Publikationsmonat/-jahr 01.2024
Sprache Englisch
Identifikator ISSN: 2073-4344
KITopen-ID: 1000168199
HGF-Programm 43.33.11 (POF IV, LK 01) Adaptive and Bioinstructive Materials Systems
Erschienen in Catalysts
Verlag MDPI
Band 14
Heft 1
Seiten Art.-Nr.: 87
Vorab online veröffentlicht am 21.01.2024
Schlagwörter Au-Pd/TiO2 catalysts, Ir/TiO2 catalysts, water oxidation, valence band, cerium ammonium nitrate (CAN), XPS Au5d, XPS Pd4d
Nachgewiesen in Scopus
Web of Science
Dimensions
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