期刊
ACS APPLIED MATERIALS & INTERFACES
卷 7, 期 25, 页码 14123-14129出版社
AMER CHEMICAL SOC
DOI: 10.1021/acsami.5b03409
关键词
nanostructures; crystallinity; solar water splitting; hermatite; hybrid microwave annealing
资金
- Brain Korea Plus Program of Ministry of Education, Korean Center for Artificial Photosynthesis - MISIP [NRF-2011-CIAAA0001-2011-0030278]
- MOTIE of Republic of Korea [10050509]
- Ulsan National Institute of Science and technology (UNIST)
High-temperature annealing above 700 degrees C improves the activity of photoelectrochemical water oxidation by hematite photoanodes by increasing its crystallinity. Yet, it brings severe agglomeration of nanostructured hematite thin films and deteriorates electrical conductivity of the transparent conducting oxide (TCO) substrate. We report here that the nanostructure of the hematite and the conductivity of TCO could be preserved, while the high crystallinity is attained, by hybrid microwave annealing (HMA) utilizing a graphite susceptor for efficient microwave absorption. Thus, the hematite thin-film photoanodes treated by HMA record 2 times higher water oxidation photocurrents compared to a conventional thermal-annealed photoanode. The enhanced performance can be attributed to the synergistic effect of a smaller feature size of nanostructure-preserved hematite and a good electrical conductivity of TCO. The method could be generally applied to the fabrication of efficient photoelectrodes with small feature sizes and high crystallinity, which have been mutually conflicting requirements with conventional thermal annealing processes.
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