| 초록 |
Photoelectrochemical (PEC) water splitting is an ideal energy conversion technology for clean and sustainable energy economy. Various metal oxides have been utilized as efficient semiconductor materials for enhancing PEC water splitting. Among them, tungsten trioxide (WO3) has attracted high attention because of its suitable band gap, long hole diffusion length and high conductivity. However, WO3 has difficulties to apply PEC application because of its limitations of light harvesting efficiency, surface reaction kinetics and charge carrier separation/transfer ability. The sol-flame doping method is regarded as significantly efficient alternative to easily introduce metal dopant without affecting WO3 morphology and damaging substrate, and to control electronic structure and surface catalytic properties of the WO3 electrode. In this study, we report the design of the Fe-incorporated WO3 structure which is surface-treated by thermal shocking of ultrafast flame annealing process. The flame-induced hybrid structure of WO3 remarkably restricts charge recombination and increases surface catalytic properties to improve PEC performance. |
