| 학회 |
한국재료학회 |
| 학술대회 |
2015년 가을 (11/25 ~ 11/27, 부산 해운대그랜드호텔) |
| 권호 |
21권 2호 |
| 발표분야 |
C. 에너지 재료 |
| 제목 |
Multi-junction Photo-anode: CoO Sensitized TiO2 Nanorod/FTO for Efficient Water Splitting |
| 초록 |
Multi-junction photo-electrode for overall water splitting is always challenging on the basis of electronic and thermodynamic requirements. A tandem nanostructure consisting of n-type and p-type semiconductors for overall water splitting is always desirable without external bias. It is very well known that titanium dioxide (TiO2) nanostructures reported to have high chemical stability, low cost, abundance as well as the favorable band edge alignment with water redox potentials which make them a potential candidate as photo-anodes for water oxidation which have been extensively studied. CoO systems are not much studied widely because of its less stability and difficulty in selective preparation. The micro-powder state of CoO has a band gap of 2.6 eV with valence band lying way below with a value of ~3.5 eV. When it’s changed to nano-crystalline state, band gap position changes drastically, enabling it for overall water splitting. The p-type CoO nanostructures could be an efficient photocathode. So by coupling CoO with TiO2 with specific nanostructures could be crucial for overall water splitting. In the present work, we will compare the photo-catalytic activity of different configurations of combined systems constituted by CoO nano-structure with TiO2 nanorods grown on FTO substrate. TiO2 nanorods were grown on FTO by hydrothermal synthesis. The nanoparticles and nanorods of CoO were prepared by spin-coating followed by calcination and hydrothermal synthesis followed by annealing in inert atmosphere respectively. The nanostructures were characterized by XRD, FE-SEM and HRTEM analysis. Photo-electrochemical properties were characterized by measuring photocurrents responses under both white and visible light illumination. In addition, gas evolution tests will be confirmed by using PEC cell without external bias. |
| 저자 |
Beelyong Yang, Vivek Ramakrishnan
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| 소속 |
Kumoh National Institute of Technology |
| 키워드 |
Photo catalyst; Titanium dioxide; cobalt oxide; water splitting; semiconductor
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| E-Mail |
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