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Shape-Dependent Charge Transfers in Crystalline ZnO Photocatalysts: Rods versus Plates

Title
Shape-Dependent Charge Transfers in Crystalline ZnO Photocatalysts: Rods versus Plates
Authors
Jeong, HW[Jeong, Hye Won]Choi, SY[Choi, Seung-Yo]Hong, SH[Hong, Seong Hui]Lim, SK[Lim, Sang Kyoo]Han, DS[Han, Dong Suk]Abdel-Wahab, A[Abdel-Wahab, Ahmed]Park, H[Park, Hyunwoong]
DGIST Authors
Hong, SH[Hong, Seong Hui]; Lim, SK[Lim, Sang Kyoo]
Issue Date
2014-09-18
Citation
Journal of Physical Chemistry C, 118(37), 21331-21338
Type
Article
Article Type
Article
Keywords
Analysis ToolsAromatic CompoundsCharge TransferChlorine CompoundsElectron TransitionsFree Radical ReactionsFree RadicalsMolecular HydrogenOxygenOxygen InterstitialsOxygen VacanciesPhoto-Catalytic ActivitiesPhotoluminescencePlate ConfigurationRedox ReactionsSingle Electron TransferSolvothermal MethodSurface ReactionsTwo-Electron TransferVacanciesX Ray Photoelectron SpectroscopyZincZinc ChlorideZinc CompoundsZinc Oxide
ISSN
1932-7447
Abstract
ZnO particles with rod and plate configurations were synthesized using a solvothermal method using zinc acetate and zinc chloride, respectively. The surface of the as-synthesized ZnO rods and plates were characterized using various analysis tools (XRD, XPS, photoluminescence, FE-SEM, HR-TEM, BET, and UV-vis) and their photocatalytic activities were examined for six different redox reactions. The surface areas and bandgaps of the two ZnO samples were nearly identical; however, XPS and photoluminescence (PL) studies showed that the rods and the plates have relatively pronounced oxygen vacancy and oxygen interstitial contributions, respectively. ZnO rods were found to be active for the decomposition of methylene blue and phenol, the production of OH radicals, and the generation of photocurrents, all of which are associated with single-electron transfer reactions. On the other hand, ZnO plates were more effective for the production of molecular hydrogen and hydrogen peroxide, both of which are initiated by two-electron transfer reactions. These single versus multiple charge transfers are discussed with regard to the roles of oxygen vacancies and oxygen interstitials, which are located near the conduction and the valence bands, respectively. © 2014 American Chemical Society.
URI
http://hdl.handle.net/20.500.11750/3034
DOI
10.1021/jp506032f
Publisher
American Chemical Society
Files:
There are no files associated with this item.
Collection:
Division of Nano∙Energy Convergence Research1. Journal Articles


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