NDLI: Characterization of Mixed Metal Oxide Interfaces Based on TiO2-supported CeO2-x Nanoparticles

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Characterization of Mixed Metal Oxide Interfaces Based on TiO2-supported CeO2-x Nanoparticles

Content Provider	Semantic Scholar
Author	Haiber, Diane M. Phan, Tu-Uyen Venkatraman, Kartik Crozier, Peter A.
Copyright Year	2018
Abstract	High energy conversion efficiency for solar fuel generation through photocatalytic water splitting necessitates visible light absorbing, high quantum efficiency materials. Historically, TiO2 has become a widely studied ‘model’ system for this application at the expense of visible light absorption. In 2009, photocatalytic degradation of methylene blue under visible light using TiO2-supported CeO2 was demonstrated and attributed to a ‘coupled semiconductor’ mechanism [1]. Here, the supported CeO2 absorbs visible light photons (due an enrichment of Ce at the grain boundaries) and transfers photoexcited electrons to TiO2 due to its more negative conduction band minimum. More recent experimental evidence showing Ce enrichment at the CeO2-TiO2 interface suggests a mixed-metaloxide (MMO) mechanism wherein partially occupied Ce-4f levels introduce a donor state into TiO2’s bandgap, effectively reducing the bandgap energy [2]. However, structure-activity relationships regarding the impact of increasing Ce concentration on O2/H2 evolution rates remain inconsistent, possibly due to the inability to distinguish Ce at the interface vs. in the bulk of CeO2 particles [2,3]. By utilizing monochromated EELS, the electronic structure about mixed metal oxide interfaces may be directly characterized to elucidate the impact of Ce species on the light absorbing properties.
Starting Page	458
Ending Page	459
Page Count	2
File Format	PDF HTM / HTML
DOI	10.1017/s1431927618002787
Volume Number	24
Alternate Webpage(s)	https://www.cambridge.org/core/services/aop-cambridge-core/content/view/S1431927618002787
Alternate Webpage(s)	http://minisites.cambridgecore.org/MAM2018/7337/0458.pdf
Alternate Webpage(s)	https://doi.org/10.1017/s1431927618002787
Language	English
Access Restriction	Open
Content Type	Text
Resource Type	Article

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