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2015 ; 5
(ä): 10461
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Plasmonic silver quantum dots coupled with hierarchical TiO2 nanotube arrays
photoelectrodes for efficient visible-light photoelectrocatalytic hydrogen
evolution
#MMPMID26067850
Lian Z
; Wang W
; Xiao S
; Li X
; Cui Y
; Zhang D
; Li G
; Li H
Sci Rep
2015[Jun]; 5
(ä): 10461
PMID26067850
show ga
A plasmonic Ag/TiO2 photocatalytic composite was designed by selecting Ag quantum
dots (Ag QDs) to act as a surface plasmon resonance (SPR) photosensitizer for
driving the visible-light driven photoelectrocatalytic hydrogen evolution.
Vertically oriented hierarchical TiO2 nanotube arrays (H-TiO2-NTAs) with
macroporous structure were prepared through a two-step method based on
electrochemical anodization. Subsequently, Ag QDs, with tunable size
(1.3-21.0?nm), could be uniformly deposited on the H-TiO2 NTAs by current pulsing
approach. The unique structure of the as-obtained photoelectrodes greatly
improved the photoelectric conversion efficiency. The as-obtained Ag/H-TiO2-NTAs
exhibited strong visible-light absorption capability, high photocurrent density,
and enhanced photoelectrocatalytic (PEC) activity toward photoelectrocatalytic
hydrogen evolution under visible-light irradiation (?>420?nm). The enhancement in
the photoelectric conversion efficiency and activity was ascribed to the
synergistic effects of silver and the unique hierarchical structures of TiO2
nanotube arrays, strong SPR effect, and anti-shielding effect of ultrafine Ag
QDs.