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Enzyme‐Like Catalytic Activity of Porphyrin‐Functionalized Ceria Nanotubes for Water Oxidation
Author(s) -
Meng Jiao,
Li Haining,
Chen Ruiping,
Sun Xun,
Sun Xuan
Publication year - 2019
Publication title -
chempluschem
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.801
H-Index - 61
ISSN - 2192-6506
DOI - 10.1002/cplu.201900625
Subject(s) - catalysis , porphyrin , chemistry , photosensitizer , catalase , photochemistry , redox , artificial photosynthesis , catalytic oxidation , context (archaeology) , kinetics , combinatorial chemistry , enzyme , inorganic chemistry , organic chemistry , photocatalysis , paleontology , physics , quantum mechanics , biology
Artificial enzymes have broad applications in catalysis and can be used to help understand catalytic mechanisms. Nanoceria has various enzyme‐mimetic properties that depend on the relative content of Ce 3+ and Ce 4+ . In this context, CeO 2 nanotubes was investigated as catalase mimics for water oxidation. The photosensitizer 5,10,15,20‐meso‐tetra(4‐carboxyphenyl) porphyrin (TCPP) was facilely embedded in CeO 2 nanotubes (TCPP@CeO 2 NTs), and photoinduced charge transfer was shown to occur between the strongly coupled TCPP and CeO 2 , which leads to effective charge separation and charge redistribution within the hybrids. As a consequence, formation of H 2 O 2 , a competing process in water oxidation and a key factor that affects the oxidative stability of photoelectrodes, was effectively inhibited on TCPP@CeO 2 NTs. These findings show that enzyme mimics can be used for the selective generation of reactive oxygen species, and therefore to control the kinetics of water oxidation.