| 초록 |
Recently, researches on renewable energy has been actively conducted as environmental pollution widely becomes a serious problem. Among them, hydrogen is attracting attention as eco-friendly energy source because it has high energy density and does not generate pollutants and greenhouse gases. Photoelectrochemical(PEC) cells, which directly convert solar to chemical energy, are promising for the production of hydrogen. TiO2 has been extensively used for photocatalytic and PEC reaction of solar hydrogen because of its chemical stability, nontoxicity and relatively low cost. However the large band gap of TiO2 limits its light absorption to only 5% of solar spectrum. In this study, visible-light absorption of TiO2 was achieved by using thee-dimensional gold nanotube electrode. It can increase the reaction surface area of the PEC cell and it also enhanced surface plasmon resonace(SPR) on the visible range by implementing the three-dimensional metal/semiconductor/metal composite system. Au nanotube was fabricated using nanoimprint-based template fabrication, secondary sputtering and lift-off process. Since the nanoimprint-based process was used, nano-sized array can be formed by a simple process and it can be applied to a large area. We fabricated Au NT/TiO2/Au NPs system for photoelectrochemical water splitting with simple process. Solar-to-electric conversion efficiency was increased due to surface area increase and plasmonic effect by fabricated system. This study has not been done before and it can be considered to be highly worthy of research. |
