An in situ mediator-free route to fabricate Cu2O/g-C3N4 type-II heterojunctions for enhanced visible-light photocatalytic H-2 generation

作者：Ji, Cong; Yin, Su-Na^*; Sun, Shasha; Yang, Shengyang^*

来源：Applied Surface Science, 2018, 434: 1224-1231.

DOI：10.1016/j.apsusc.2017.11.233

• Cu2O/g-C3N4
• Hybrids
• Photocatalytic
• Hydrogen production
• Mediator free
• In situ synthesis

Cu2O nanoparticles doped g-C3N4 are synthesized via an in situ method and investigated in detail by IR techniques, X-ray diffraction, X-ray photoelectron spectroscopy, transmission electron microscopy, ultraviolet visible diffuse reflection spectroscopy, and photoluminescence spectroscopy. The as-prepared Cu2O/g-C3N4 hybrids demonstrate enhanced photocatalytic activity toward hydrogen generation compared to pure bulk g-C3N4, the effect of Cu2O content on the rate of visible light photocatalytic hydrogen evolution reveals the optimal hydrogen evolution rate can reach 33.2 mu mol h(-1) g(-1), which is about 4 times higher that of pure g-C3N4. The enhanced photocatalytic activity can be attributed to the improved separation and transfer of photogenerated electron-hole pairs at the intimate interface between g-C3N4 and Cu2O. A possible photocatalytic mechanism of the Cu2O/g-C3N4 composite is also discussed. This mediator-free in situ chemical doping strategy developed in this work will contribute to the achievement of other multicomponent photocatalysts.

• 出版日期2018-3-15
• 单位扬州大学; 江苏科技大学