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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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Self-motivated, thermally oxidized hematite nanoflake photoanodes: Effects of pre-polishing and ZrO2 passivation layer

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Title
Self-motivated, thermally oxidized hematite nanoflake photoanodes: Effects of pre-polishing and ZrO2 passivation layer
Author
Dhandole, Love KumarLee, Hyun HwiCha, Weon-SikJang, Jum SukLee, Jae Sung
Issue Date
2022-02
Publisher
Elsevier BV
Citation
JOURNAL OF ENERGY CHEMISTRY, v.65, pp.415 - 423
Abstract
High-temperature thermal oxidation of an Fe foil produces a high-quality, crystalline hematite nanoflake suitable as a photoanode for the photoelectrochemical (PEC) water oxidation. Physical pre-polishing of the foil surface has a profound effect in the formation of a vertically-aligned nanoflakes of hematite phase with extended (110) planes by removing the loosely-bonded oxide layer. When the surface of the photoanode is modified with a ZrO2 passivation layer and a cobalt phosphate co-catalyst, the charge recombination at the photoanode-electrolyte interface is greatly suppressed to improve its overall PEC activity. As a result, the photocurrent density at 1.10 VRHE under 1 sun condition is enhanced from 0.22 mA cm−2 for an unmodified photoanode to 0.59 mA cm−2 for the fully modified photoanode, and the photocurrent onset potential is shifted cathodically by 400 mV. Moreover, the photoanode demonstrates outstanding stability by showing steady production of H2 and O2 gases in the stoichiometric ratio of 2:1 in a continuous PEC operation for 10 h.
URI
https://scholarworks.unist.ac.kr/handle/201301/54103
DOI
10.1016/j.jechem.2021.06.009
ISSN
2095-4956
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ECHE_Journal Papers
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