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Shape-Dependent Charge Transfers in Crystalline ZnO Photocatalysts: Rods versus Plates
- Shape-Dependent Charge Transfers in Crystalline ZnO Photocatalysts: Rods versus Plates
- 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
- Journal of Physical Chemistry C, 118(37), 21331-21338
- Article Type
- Analysis Tools; Aromatic Compounds; Charge Transfer; Chlorine Compounds; Electron Transitions; Free Radical Reactions; Free Radicals; Molecular Hydrogen; Oxygen; Oxygen Interstitials; Oxygen Vacancies; Photo-Catalytic Activities; Photoluminescence; Plate Configuration; Redox Reactions; Single Electron Transfer; Solvothermal Method; Surface Reactions; Two-Electron Transfer; Vacancies; X Ray Photoelectron Spectroscopy; Zinc; Zinc Chloride; Zinc Compounds; Zinc Oxide
- 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.
- American Chemical Society
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