Comprehensive Study of All-Solid-State Z-Scheme Photocatalytic Systems of ZnO/Pt/CdZnS

被引：46

作者：

Isimjan, Tayirjan Taylor ^{[1
]}

Maity, Partha ^{[2
]}

Llorca, Jordi ^{[3
,4
]}

Ahmed, Toseef ^{[5
]}

Parida, Manas R. ^{[2
]}

Mohammed, Omar F. ^{[2
]}

Idriss, Hicham ^{[1
]}

机构：

[1] KAUST, SABIC CRD, Fundamental Catalysis, Thuwal 239556900, Saudi Arabia

[2] KAUST, Solar Ctr, Div Phys Sci & Engn, Thuwal 239556900, Saudi Arabia

[3] Tech Univ Catalonia, EEBE, Inst Energy Technol, Dept Chem Engn, Barcelona 08930, Spain

[4] Tech Univ Catalonia, EEBE, Barcelona Res Ctr Multiscale Sci & Engn, Barcelona 08930, Spain

[5] SABIC Technol Ctr, Riyadh 11422, Saudi Arabia

来源：

ACS OMEGA | 2017年 / 2卷 / 08期

关键词：

ELECTRON-HOLE RECOMBINATION; HYDROGEN GENERATION; EXCITON DYNAMICS; WATER; CDS; EVOLUTION; ENERGY; HETEROSTRUCTURE; HETEROJUNCTION; SEMICONDUCTORS;

D O I：

10.1021/acsomega.7b00767

中图分类号：

O6 [化学];

学科分类号：

0703 ;

摘要：

We have investigated a Z-scheme based on a ZnO/Pt/CdZnS photocatalyst, active in the presence of a complex medium composed of acetic acid and benzyl alcohol, the effects of which on the catalyst stability and performance are studied. Transmission electron microscopy images showed uniformly dispersed sub-nanometer Pt particles. Inductively coupled plasma and X-ray photoelectron spectroscopy analyses suggested that Pt is sandwiched between ZnO and CdZnS. An apparent quantum yield (AQY) of 34% was obtained over the [ZnO] 4/1 wt % Pt/CdZnS system at 360 nm, 2.5-fold higher than that of 1% Pt/CdZnS (14%). Furthermore, an AQY of 16% was observed using [ZnO] 4/1 wt % Pt/ CdZnS, which was comparable to that of 1 wt % Pt/CdZnS (10%) at 460 nm. On the basis of these results, we proposed a charge transfer mechanism, which was confirmed through femtosecond transient absorption spectroscopy. Finally, we identified the two main factors that affected the stability of the catalyst, which were the sacrificial reagent and the acidic pH.

引用

页码：4828 / 4837

页数：10

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