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2015 ; 5
(ä): 12170
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An Inexpensive Co-Intercalated Layered Double Hydroxide Composite with Electron
Donor-Acceptor Character for Photoelectrochemical Water Splitting
#MMPMID26174201
Zheng S
; Lu J
; Yan D
; Qin Y
; Li H
; Evans DG
; Duan X
Sci Rep
2015[Jul]; 5
(ä): 12170
PMID26174201
show ga
In this paper, the inexpensive 4,4-diaminostilbene-2,2-disulfonate (DAS) and
4,4-dinitro-stilbene-2,2- disulfonate (DNS) anions with arbitrary molar ratios
were successfully co-intercalated into Zn2Al-layered double hydroxides (LDHs).
The DAS(50%)-DNS/LDHs composite exhibited the broad UV-visible light absorption
and fluorescence quenching, which was a direct indication of photo-induced
electron transfer (PET) process between the intercalated DAS (donor) and DNS
(acceptor) anions. This was confirmed by the matched HOMO/LUMO energy levels
alignment of the intercalated DAS and DNS anions, which was also compatible for
water splitting. The DAS(50%)-DNS/LDHs composite was fabricated as the photoanode
and Pt as the cathode. Under the UV-visible light illumination, the enhanced
photo-generated current (4.67 mA/cm(2) at 0.8 V vs. SCE) was generated in the
external circuit, and the photoelectrochemical water split was realized.
Furthermore, this photoelectrochemical water splitting performance had excellent
crystalline, electrochemical and optical stability. Therefore, this novel
inorganic/organic hybrid photoanode exhibited potential application prospect in
photoelectrochemical water splitting.