AI Article Synopsis
- * The unique electronic structure of CeO, particularly its 4f states, complicates understanding charge transfer and light absorption compared to traditional photocatalysts like TiO, leading to ambiguities in its photocatalytic mechanisms.
- * The review consolidates current literature on CeO photocatalysis, addressing its misunderstood physics, showcasing recent computational insights, and suggesting future research directions to tackle existing knowledge gaps.
Article Abstract
Emerging photocatalytic applications of cerium dioxide (CeO) include green hydrogen production, CO conversion to fuels, and environmental remediation of various toxic molecules. These applications leverage the oxygen storage capacity and tunable surface chemistry of CeO to photocatalyze the chosen reaction, but many open questions remain regarding the fundamental physics of photocatalysis over CeO. The commonly ascribed 'bandgap' of CeO (∼3.1 eV) differs fundamentally from other photocatalytic oxides such as TiO; UV light excites an electron from the CeO valence band into a 4f state, generating a polaron as the lattice distorts around the localized charge. Researchers often disregard the distinction between the 4f state and a traditional, delocalized conduction band, resulting in ambiguity regarding mechanisms of charge transfer and visible-light absorption. This review summarizes modern literature regarding CeO photocatalysis and discusses commonly reported photocatalytic reactions and visible light-sensitization strategies. We detail the often misunderstood fundamental physics of CeO photocatalysis and supplement previous work with original computational insights. The exceptional progress and remaining challenges of CeO-based photocatalysts are highlighted, along with suggestions for further research directions based on the observed gaps in current understanding.
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| http://dx.doi.org/10.1039/d4nr00676c | DOI Listing |
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