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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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An in situ fluorine and ex situ titanium two-step co-doping strategy for efficient solar water splitting by hematite photoanodes

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Title
An in situ fluorine and ex situ titanium two-step co-doping strategy for efficient solar water splitting by hematite photoanodes
Author
Kang, KyoungwoongZhang, HeminKim, Jeong HunByun, Woo JinLee, Jae Sung
Issue Date
2022-02
Publisher
ROYAL SOC CHEMISTRY
Citation
NANOSCALE ADVANCES, v.4, no.6, pp.1659 - 1667
Abstract
A unique two-step co-doping strategy of in situ fluorine doping followed by ex situ titanium doping enhances the performance of the hematite photoanode in photoelectrochemical water splitting much more effectively than single-step co-doping strategies that are either all in situ or all ex situ. The optimized fluorine, titanium co-doped Fe2O3 photoanode without any cocatalyst achieves 1.61 mA cm(-2) at 1.23 V-RHE under 100 mW cm(-2) solar irradiation, which is similar to 2 and 3 times those of titanium or fluorine singly-doped Fe2O3 photoanodes, respectively. The promotional effect is attributed to the synergy of the two dopants, in which the doped fluorine anion substitutes oxygen of Fe2O3 to increase the positive charges of iron sites, while the doped titanium cation substitutes iron to increase free electrons. Moreover, excess titanium on the surface suppresses the drain of in situ doped fluorine and agglomeration of hematite during the high-temperature annealing process, and passivates the surface trap states to further promote the synergy effects of the two dopants.
URI
https://scholarworks.unist.ac.kr/handle/201301/57679
URL
https://pubs.rsc.org/en/content/articlelanding/2022/NA/D2NA00029F
DOI
10.1039/d2na00029f
ISSN
2516-0230
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ECHE_Journal Papers
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