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Song, Myoung Hoon
Organic Photonics & Optoelectronics Lab
Research Interests
  • Organic optoelectrics, perovskite light-emitting diodes, surface treatment, photonic crystals

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Activating the surface and bulk of hematite photoanodes to improve solar water splitting

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Title
Activating the surface and bulk of hematite photoanodes to improve solar water splitting
Author
Zhang, HeminPark, Jong HyunByun, WoojinSong, Myoung HoonLee, Jae Sung
Issue Date
2019-11
Publisher
ROYAL SOC CHEMISTRY
Citation
CHEMICAL SCIENCE, v.10, no.44, pp.10436 - 10444
Abstract
A simple electrochemical activation treatment is proposed to improve effectively the photoelectrochemical performance of Nb,Sn co-doped hematite nanorods. The activation process involves an initial thrice cathodic scanning (reduction) and a subsequent thrice anodic scanning (oxidation), which modifies both the surface and bulk properties of the Nb,Sn:Fe2O3 photoanode. First, it selectively removes the surface components to different extents endowing the hematite surface with fewer defects and richer Nb-O and Sn-O bonds and thus passivates the surface trap states. The surface passivation effect also enhances the photoelectrochemical stability of the photoanode. Finally, more Fe2+ ions or oxygen vacancies are generated in the bulk of hematite to enhance its conductivity. As a result, the photocurrent density is increased by 62.3% from 1.88 to 3.05 mA cm(-2) at 1.23 V-RHE, the photocurrent onset potential shifts cathodically by similar to 70 mV, and photoelectrochemical stability improves remarkably relative to the pristine photoanode under simulated sunlight (100 mW cm(-2)).
URI
https://scholarworks.unist.ac.kr/handle/201301/30606
URL
https://pubs.rsc.org/en/content/articlelanding/2019/SC/C9SC04110A#!divAbstract
DOI
10.1039/c9sc04110a
ISSN
2041-6520
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MSE_Journal Papers
ECHE_Journal Papers
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