| 초록 |
About 400 semiconductor solids are known to have photocatalytic activity for water splitting. Yet they could not satisfy all the requirements for practical use: i) suitable band gap energy (~ 2 eV) for high efficiency, ii) proper band position for reduction/oxidation of water, iii) long-term stability, iv) low cost, v) high crystallinity, and vi) high conductivity. We have selected intrinsically stable metal oxide semiconductors made of earth-abundant elements. But because of their poor charge mobility, we employ multiple modifications strategy to minimize recombination of generated photoelectrons and holes, and extract full potential of the materials. Finally, we construct a stand-alone solar fuel production system by combining with a solar cell in tandem, which provides bias voltage needed for unassisted solar fuel production utilizing only solar energy. |
