Awakening Solar Water-Splitting Activity of ZnFe2O4 Nanorods by Hybrid Microwave Annealing
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- Awakening Solar Water-Splitting Activity of ZnFe2O4 Nanorods by Hybrid Microwave Annealing
- Kim, Ju Hun; Kim, Jin Hyun; Jang, Ji-Wook; Kim, Jae Young; Choi, Sun Hee; Magesh, Ganesan; Lee, Jinwoo; Lee, Jae Sung
- Issue Date
- WILEY-V C H VERLAG GMBH
- ADVANCED ENERGY MATERIALS, v.5, no.6, pp.1401933
- 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.
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