TY - JOUR
T1 - Comprehensive Study of All-Solid-State Z-Scheme Photocatalytic Systems of ZnO/Pt/CdZnS
AU - Isimjan, Tayirjan Taylor
AU - Maity, Partha
AU - Llorca, Jordi
AU - Ahmed, Toseef
AU - Parida, Manas R.
AU - Mohammed, Omar F.
AU - Idriss, Hicham
N1 - KAUST Repository Item: Exported on 2020-10-01
Acknowledgements: This work was financially supported by SABIC-CRD at KAUST. J.L. is Serra Húnter Fellow and is grateful to the ICREA Academia program and MINECO/FEDER grant ENE2015-63969-R.
PY - 2017/8/22
Y1 - 2017/8/22
N2 - 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.
AB - 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.
UR - http://hdl.handle.net/10754/625403
UR - http://pubs.acs.org/doi/abs/10.1021/acsomega.7b00767
UR - http://www.scopus.com/inward/record.url?scp=85050941355&partnerID=8YFLogxK
U2 - 10.1021/acsomega.7b00767
DO - 10.1021/acsomega.7b00767
M3 - Article
SN - 2470-1343
VL - 2
SP - 4828
EP - 4837
JO - ACS Omega
JF - ACS Omega
IS - 8
ER -