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Lee, Jae Sung
Eco-friendly Catalysis and Energy Lab
Research Interests
  • Photocatalytic water splitting, artificial photosynthesis, fuel cells, heterogeneous catalysis

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Nanostructure-Preserved Hematite Thin Film for Efficient Solar Water Splitting

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Title
Nanostructure-Preserved Hematite Thin Film for Efficient Solar Water Splitting
Author
Kim, Jae YoungYoun, Duck HyunKim, Ju HunKim, Hyun GyuLee, Jae Sung
Issue Date
2015-07
Publisher
AMER CHEMICAL SOC
Citation
ACS APPLIED MATERIALS & INTERFACES, v.7, no.25, pp.14123 - 14129
Abstract
High-temperature annealing above 700 °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.
URI
https://scholarworks.unist.ac.kr/handle/201301/12769
URL
http://pubs.acs.org/doi/abs/10.1021/acsami.5b03409
DOI
10.1021/acsami.5b03409
ISSN
1944-8244
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