4.8 Article

Precisely-controlled, a few layers of iron titanate inverse opal structure for enhanced photoelectrochemical water splitting

期刊

NANO ENERGY
卷 62, 期 -, 页码 20-29

出版社

ELSEVIER
DOI: 10.1016/j.nanoen.2019.05.025

关键词

Iron titanate; Inverse opal structure; Layer-by-layer self-assembly; Hybrid microwave annealing; Photoelectrochemical water splitting

资金

  1. Basic Science Grant [NRF-2018R1A2A1A05077909]
  2. Climate Change Response Project [2015M1A2A2074663]
  3. Korea Center for Artificial Photosynthesis (KCAP) [2009-0093880]
  4. Korea-China Key Joint Research Program [2017K2A9A2A11070341]
  5. Next Generation Carbon Upcycling Project - Ministry of Science and ICT, Republic of Korea [2017M1A2A2043138]
  6. Ministry of Trade, Industry and Energy, Republic of Korea [10050509, KIAT N0001754]
  7. [NRF-2014R1A5A1009799]
  8. National Research Foundation of Korea [2017M1A2A2043138] Funding Source: Korea Institute of Science & Technology Information (KISTI), National Science & Technology Information Service (NTIS)

向作者/读者索取更多资源

Iron titanate (Fe2TiO5) is a promising photoanode material due to a narrow band gap, appropriate band edges, robustness and abundance. However, its performance is limited because of its low conductivity and short hole diffusion length. Precisely controlled, a few Fe2TiO5 layers of inverse opal structure (IOS) is fabricated via a layer-by-layer self-assembly and then treated by hybrid microwave annealing to produce a highly crystalline, yet IOS morphology-preserved Fe2TiO5 photoanode film for solar water splitting. The highly transparent Fe2TiO5 IOS film shows a greatly enhanced visible light harvesting, higher density of catalytically more active crystal planes, and many single crystalline nanoplates grown on the IOS architecture, relative to a reference planar film prepared under similar conditions. As a result, the optimized 'exactly' three Fe2TiO5 layers IOS electrode with a sacrificial gallium oxide underlayer and a ternary (Ni2CoFe) OOH co-catalyst records 2.08 mA cm(-2) at 1.23 VRHE under 1 sun (100 mW cm(-2)) irradiation, which is the highest photocurrent density produced by Fe2TiO5 photoanode up to date.

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