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|
| Type |
Poster Presentation |
| Area |
Environmental Energy |
| Room No. |
Event Hall |
| Time |
4월 20일 (금요일) 11:00~12:30 |
| Code |
ENVR.P-676 |
| Subject |
Solar spectrum photocatalytic conversion of CO2 to CH4 utilizing TiO2 nanotube arrays embedded with graphene quantum dots |
| Authors |
HyeRim Kim, SU IL IN*
Department of Energy Systems Engineering, Daegu Gyeongbuk Institute of Science & Technology, Korea
|
| Abstract |
TiO2 nanotube arrays (TNTs) offer an exciting prospect as a photocatalytic material architecture due to the combined properties of high surface area, 1-D vectorial charge transfer, and reduced photogenerated charge recombination. However, the TiO2 band gap ≈ 3.2 eV, limits light absorption to the UV region which contains but a small fraction of the solar spectrum energy. Graphene is known to effectively absorb visible light, and due to its high conductivity promote efficient charge transfer. Herein, we present a novel photocatalyst composed of TNTs sensitized with electrodeposited graphene quantum dots (GQDs). The GQDs electrodeposition duration is varied to optimize photocatalytic performance of the graphene-TNT nanostructure (G-TNT), with properties investigated by transient photocurrent measurement, electrical impedance spectroscopy, methylene blue (MB) degradation, and photocatalytic conversion of CO2 to CH4. Under solar spectrum illumination optimal G-TNT samples promote a CO2 to CH4 photocatalytic conversion rate of 1.98 ppm cm-2 h-1, with carbon origin confirmed by 13CO2 isotopic tests. |
| E-mail |
hyerim1005@dgist.ac.kr |
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121st General Meeting of the KCS