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- Title
Engineering Highly Ordered Iron Titanate Nanotube Array Photoanodes for Enhanced Solar Water Splitting Activity.
- Authors
Zhang, Hemin; Kim, Ju Hun; Kim, Jin Hyun; Lee, Jae Sung
- Abstract
Highly ordered iron titanate (Fe2TiO5) nanotube array photoanode is synthesized on F:SnO2 glass with ultrathin anodized aluminum oxide as a hard template. Highly crystalline, yet the nanotube array morphology-preserved Fe2TiO5 is fabricated by hybrid microwave annealing (HMA). The effects of the synthesis parameters on photoelectrochemical (PEC) water splitting activity under simulated sunlight are systematically studied including HMA time, pore size, wall thickness, and length of the nanotubes to optimize the nanotube array photoanode. In addition, triple modification strategies of TiO2 underlayer, hydrogen treatment, and FeNiO x cocatalyst loading effectively improve the PEC activity further. The systematically engineered nanotube array photoanode achieves a photocurrent density of 0.93 mA cm−2 at 1.23 VRHE under 1 sun (100 mW cm−2) irradiation, which corresponds to 2.6 times that of the previous best Fe2TiO5 photoanode. In addition, the photocurrent onset potential shifts cathodically by ≈280 mV relative to the pristine nanotube array electrode.
- Subjects
NANOSTRUCTURED materials synthesis; NANOTUBES; IRON compound synthesis; ALUMINUM compound synthesis; WATER electrolysis; PORE size distribution
- Publication
Advanced Functional Materials, 2017, Vol 27, Issue 35, pn/a
- ISSN
1616-301X
- Publication type
Article
- DOI
10.1002/adfm.201702428