| 초록 |
One of the renewable energy sources, hydrogen energy has been attracted as alternatives of the fossil fuels. A hydrogen fuel cell has been recently applied to various systems. However, while demand of hydrogen shall be tremendously increased in the hydrogen era, an effective technology for ecological hydrogen generation has not been developed yet. Current technologies for hydrogen production include the chemical extraction from fossil fuels such as natural gas and coal or electrolysis of water using electric power. By products such as CO or CO2 resulting from the processes in these methods causes environment pollution. In this work, we demonstrated the improved charge transfer and collection in PEC system by using a graphene decorated TiO2 nanorods photo-anode. TiO2 nanorods were directly grown on graphene/FTO glass by hydrothermal method. Their morphologies of surface and cross-sectional view as well as elemental analysis were examined by FESEM, FETEM, Raman spectroscopy, and XRD. Photo-catalytic properties of bare TiO2 nanorod/FTO and TiO2 nanorod/graphene/FTO were examined by measuring photocurrent density under white light illumination. Furthermore solar hydrogen production was carried out by gas chromatography. Consequently graphene decorated TiO2 nanorods were revealed superior photocatalytic activity because the graphene sheets led to increase the mobility of charge carriers and recombination time. |
