Journal
ADVANCED ENERGY MATERIALS
Volume 5, Issue 6, Pages -Publisher
WILEY-V C H VERLAG GMBH
DOI: 10.1002/aenm.201401933
Keywords
hybrid microwave annealing; hydrogen generation; water splitting; zinc ferrite nanorods
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Funding
- Korea Center for Artificial Photosynthesis (KCAP) - Ministry of Science, ICT, and Future Planning through the National Research Foundation (NRF) of Korea [2009-0093880, 2009-0093886]
- Basic Science Research Program - Ministry of Science, ICT, and Future Planning through the National Research Foundation (NRF) of Korea [2012-017247]
- BK Plus Program - Ministry of Science, ICT, and Future Planning through the National Research Foundation (NRF) of Korea
- A3 Foresight Program - Ministry of Science, ICT, and Future Planning through the National Research Foundation (NRF) of Korea
- National Research Foundation of Korea [2012R1A2A1A01017247, 2009-0093880] Funding Source: Korea Institute of Science & Technology Information (KISTI), National Science & Technology Information Service (NTIS)
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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 degrees C increases the photocurrent density of water oxidation by 15 times. In contrast, the conventional thermal annealing at 800 degrees 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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