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Visible‐Light‐Driven Plasmonic Photocatalysis Enhanced by Charge Accumulation
Author(s) -
Kao KunChe,
Nishi Hiroyasu,
Tatsuma Tetsu
Publication year - 2019
Publication title -
chemnanomat
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.947
H-Index - 32
ISSN - 2199-692X
DOI - 10.1002/cnma.201900187
Subject(s) - photocatalysis , plasmon , materials science , semiconductor , visible spectrum , nanoparticle , optoelectronics , nanotechnology , coating , surface plasmon resonance , photochemistry , catalysis , chemistry , biochemistry
Plasmon‐induced charge separation (PICS) at the interface between a plasmonic material and semiconductor is employed to drive photocatalytic reactions for conversion and storage of solar energy. Most of the conventional photoelectrodes based on PICS have an n‐M type structure with an interface between n‐type semiconductor (typically TiO 2 ) and plasmonic metal (typically Au) nanoparticles. Here we develop n‐M‐p type photoelectrodes by coating the TiO 2 /Au photoelectrode with Ni(OH) 2 or CrO x , which can collect and store positive charges. Both of the photoelectrodes show efficient PICS under visible light and accumulate positive charges released from resonant Au nanoparticles. The accumulated charges can be used for oxidation of organic species such as ethanol in the dark. The TiO 2 /AuNP/Ni(OH) 2 photoelectrode exhibits an oxygen evolution ability under visible light with a certain bias voltage.