Journal
ACS APPLIED MATERIALS & INTERFACES
Volume 8, Issue 21, Pages 13400-13409Publisher
AMER CHEMICAL SOC
DOI: 10.1021/acsami.6b01854
Keywords
TiO2 nanorod; carbon allotropes; chalcogenide; photoelectrochemistry; solar energy conversion
Funding
- National Science Foundation [NSF-CBET-1337050]
- Brazilian Scientific Mobility Program (BSMP)
- BSMP program
- Div Of Chem, Bioeng, Env, & Transp Sys
- Directorate For Engineering [1337050] Funding Source: National Science Foundation
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The assembly of a large-bandgap one-dimensional (1D) oxide-conductive carbon-chalcogenide nanocomposite and its surface, optical, and photoelectrochemical properties are presented. Microscopy, surface analysis, and optical spectroscopy results are reported to provide insights into the assembly of the nanostructure. We have investigated (i) how the various carbon allotropes (C-60), reduced graphene oxide (RGO), carbon nanotubes (CNTs), and graphene quantum dots (GQDs) can be integrated at the interface of the 1D TiO2 and zero-dimensional (OD) CdS nanocrystals; (ii) the carbon allotrope and CdS loading effects; (iii) the impact of the carbon allotrope presence on OD CdS nanocrystals; and (iv) how they promote light absorbance. Subsequently, the functioning of the integrated nano structured assembly in a photoelectrochemical cell has been systematically investigated. These studies include (i) chronoamperometry, (ii) impedance measurements or EIS, and (iii) linear sweep voltammetry. The results indicate that the presence of a GQD interface shows the most enhancement in the photoelectrochemical properties. The optimized photocurrent values were respectively noted to be 2.8, 2.2, 1.9, and 1.6 mA/cm(2), indicating J(GQD) > J(RGO) > J(CNT) > J(fullerene). Furthermore, the annealing conditions have indicated that ammonia treatment leads to an increase in the photoelectrochemical responses when using any form of the carbon allotropes.
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