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- Title
Awakening Solar Water-Splitting Activity of ZnFe<sub>2</sub>O<sub>4</sub> Nanorods by Hybrid Microwave Annealing.
- Authors
Kim, Ju Hun; Kim, Jin Hyun; Jang, Ji‐Wook; Kim, Jae Young; Choi, Sun Hee; Magesh, Ganesan; Lee, Jinwoo; Lee, Jae Sung
- Abstract
1D zinc ferrite (ZnFe2O4) photoanode is fabricated on an F-doped tin oxide substrate at a low temperature by an all-solution method. To activate the material for photoelectrochemical water splitting, the hybrid microwave annealing (HMA) is applied with graphite powder as a susceptor. Thus, HMA treatment of ZnFe2O4 photoanode synthesized at 550 °C increases the photocurrent density of water oxidation by 15 times. In contrast, the conventional thermal annealing at 800 °C brings only 1.7-fold increase. The various physical characterizations and hole scavenger photooxidation experiments with H2O2 reveal that the post-HMA treatment anneals the surface defect states and enhances the crystallinity. Hence, HMA treatment is effective to suppress charge-carrier recombination both on the surface and in the bulk of ZnFe2O4 to bring out its latent solar water-splitting activity.
- Subjects
OXYGEN-evolving complex (Photosynthesis); ZINC iron plating; NANOROD synthesis; NANORODS spectra; ANNEALING of metals
- Publication
Advanced Energy Materials, 2015, Vol 5, Issue 6, pn/a
- ISSN
1614-6832
- Publication type
Article
- DOI
10.1002/aenm.201401933