Ce-doped ZnO (CexZn1−xO) becomes an efficient visible-light-sensitive photocatalyst by co-catalyst (Cu2+) grafting

Literature Information

Publication Date 2011-07-14
DOI 10.1039/C1CP21514K
Impact Factor 3.676
Authors

Srinivasan Anandan, Masahiro Miyauchi


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Abstract

We have fabricated an efficient visible-light-sensitive Cu2+-grafted Ce-doped ZnO photocatalyst (Cu2+–CexZn1−xO) by adopting a metal ion doping and co-catalyst modification. Impurity states were formed below the conduction band (CB) edge in CexZn1−xO, and these impurity states induce the visible-light absorption. CexZn1−xO without a Cu2+-co-catalyst showed negligible visible-light activity due to the low reduction power of electrons in impurity levels. Surprisingly, Cu2+-modification over CexZn1−xO drastically increased its visible-light activity. Excited electrons in impurity states can transfer to the Cu2+-ions on the surface and form Cu2+/Cu+ redox couples, which cause the efficient oxygen reduction through a multi-electron reduction process. One of the striking features of the present study is that the metal doped semiconductors which were inactive due to their impurity states become efficient visible-light photocatalysts upon co-catalyst modification. The successful strategy used here for designing a highly active visible-light photocatalyst would provide numerous opportunities to develop an efficient metal-ion based visible-light photocatalyst.

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Physical Chemistry Chemical Physics

Physical Chemistry Chemical Physics
CiteScore: 5.5
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Physical Chemistry Chemical Physics (PCCP) is an international journal co-owned by 19 physical chemistry and physics societies from around the world. This journal publishes original, cutting-edge research in physical chemistry, chemical physics and biophysical chemistry. To be suitable for publication in PCCP, articles must include significant innovation and/or insight into physical chemistry; this is the most important criterion that reviewers and Editors will judge against when evaluating submissions. The journal has a broad scope and welcomes contributions spanning experiment, theory, computation and data science. Topical coverage includes spectroscopy, dynamics, kinetics, statistical mechanics, thermodynamics, electrochemistry, catalysis, surface science, quantum mechanics, quantum computing and machine learning. Interdisciplinary research areas such as polymers and soft matter, materials, nanoscience, energy, surfaces/interfaces, and biophysical chemistry are welcomed if they demonstrate significant innovation and/or insight into physical chemistry. Joined experimental/theoretical studies are particularly appreciated when complementary and based on up-to-date approaches.

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