| 초록 |
Solar water splitting is a attractive way of producing hydrogen from the renewable natural resources, and heterostructure photocatalysts have been widely investigated in photocatalytic applications. In this work, flower-shaped CuxZn1-xS composite photocatalysts were prepared with various copper contents and then the composites were further treated under controlled oxygen concentrations in high temperature furnace. The efficient photo-generated charge transfer was conducted by introduction of oxide materials which constructed the Z-scheme assisted type-II heterosystem. The maximum hydrogen production rate was acheived as 595 μmol/g/h from the optimally oxidized Cu0.05Zn0.95S photocatalyst. This could be mainly attributed to the highest Cu2O crystalline phase fraction as confirmed by XRD measurement. High light absorption and low charge recombination in hetero-system were also crucial. Therefore, overall photocatalytic efficiency of the oxidized composite photocatalysts can be enhanced by optimizing their atomic contents and crystal phase fractions. |
