Comprehensive study of all-solid-state Z-scheme photocatalytic systems of ZnO/Pt/CdZnS
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Cita com:
hdl:2117/119019
Tipus de documentArticle
Data publicació2017-08-22
EditorAmerican Chemical Society (ACS)
Condicions d'accésAccés obert
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Reconeixement-NoComercial 3.0 Espanya
Abstract
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.
CitacióIsimjan, T., Maity, P., Llorca, J., Ahmed, T., Parida , M., Mohammed, O., Idriss, H. Comprehensive study of all-solid-state Z-scheme photocatalytic systems of ZnO/Pt/CdZnS. "ACS omega", 22 Agost 2017, vol. 2, p. 4828-4837.
ISSN2470-1343
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