Toward High-Performance Hematite Nanotube Photoanodes: Charge-Transfer Engineering at Heterointerfaces
- Authors
- Kim, Do Hong; Andoshe, Dinsefa M.; Shim, Young-Seok; Moon, Cheon-Woo; Sohn, Woonbae; Choi, Seokhoon; Kim, Taemin Ludvic; Lee, Migyoung; Park, Hoonkee; Hong, Kootak; Kwon, Ki Chang; Suh, Jun Min; Kim, Jin-Sang; Lee, Jong-Heun; Jang, Ho Won
- Issue Date
- 14-9월-2016
- Publisher
- AMER CHEMICAL SOC
- Keywords
- water-splitting photoanode; hematite; nanotube; NiFe cocatalysts; earth abundant
- Citation
- ACS APPLIED MATERIALS & INTERFACES, v.8, no.36, pp.23793 - 23800
- Indexed
- SCIE
SCOPUS
- Journal Title
- ACS APPLIED MATERIALS & INTERFACES
- Volume
- 8
- Number
- 36
- Start Page
- 23793
- End Page
- 23800
- URI
- https://scholar.korea.ac.kr/handle/2021.sw.korea/87525
- DOI
- 10.1021/acsami.6b05366
- ISSN
- 1944-8244
- Abstract
- Vertically ordered hematite nanotubes are considered to be promising photoactive materials for high-performance water-splitting photoanodes. However, the synthesis of hematite nanotubes directly on conducting substrates such as fluorine-doped tin oxide (FTO)/glass is difficult to be achieved because of the poor adhesion between hematite nanotubes and FTO/glass. Here, we report the synthesis of hematite nanotubes directly on FTO/glass substrate and high-performance photoelectrochemical properties of the nanotubes with NiFe cocatalysts. The hematite nanotubes are synthesized by a simple electrochemical anodization method. The adhesion of the hematite nanotubes to the FTO/glass substrate is drastically improved by dipping them in nonpolar cyclohexane prior to postannealing. Bare hematite nanotubes show a photocurrent density of 1.3 mA/cm(2) at 1.23 V vs a reversible hydrogen electrode, while hematite nanotubes with electrodeposited NiFe cocatalysts exhibit 2.1 mA/cm(2) at 1.23 V which is the highest photocurrent density reported for hematite nanotubes-based photoanodes for solar water splitting. Our work provides an efficient platform to obtain high-performance water-splitting photoanodes utilizing earth-abundant hematite and noble-metal-free cocatalysts.
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Collections - College of Engineering > Department of Materials Science and Engineering > 1. Journal Articles
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