Journal
ULTRASONICS SONOCHEMISTRY
Volume 57, Issue -, Pages 62-72Publisher
ELSEVIER SCIENCE BV
DOI: 10.1016/j.ultsonch.2019.04.041
Keywords
Ultrasonication; Pyrrolic nitrogen; Nitrogen doped reduced graphene oxide; Nitrogen doped titania; One pot hydrothermal reduction; Hydrogen evolution
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Funding
- Department of Science and Technology, Science and Engineering Research Board (DST-SERB), India [EMR/2015/001406]
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Herein, we report the simultaneous doping of nitrogen on TiO2 and reduced graphene oxide (N-TiO2/N-RGO) with exclusive stabilization of pyrrolic type nitrogen on RGO network by ultrasonic conditions followed by hydrothermal method for efficient photocatalytic H-2 production. Interestingly, during synthesis of N-TiO2/N-RGO composite, pyrrolic type nitrogen in RGO has been exclusively stabilized as confirmed by XPS analysis. The exclusive stabilization of pyrrolic nitrogen changed the optical and electronic properties of N-TiO2/N-RGO nanocomposites by giving two pi-electrons to the system for extended conjugation, which enhanced the optical absorption and charge carrier separation efficiency as confirmed by UV-Vis DRS and PL studies. Notably, N-TiO2/N-RGO nanocomposite demonstrated. This enhanced photocatalytic activity can be ascribed to synergetic action of N-TiO2 and N-RGO in optical and photogenerated charge carrier separation. Moreover, the plausible mechanism for exclusive stabilization of pyrrolic type nitrogen and enhanced photocatalytic activity were also proposed.
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