In situ synthesis of CsTi2NbO7@g-C3N4 core-shell heterojunction with excellent electrocatalytic performance for the detection of nitrite
Abstract
In this work, a N-doped CsTi2NbO7@g-C3N4 (NTCN) heterojunction nanocomposite was synthesized by a simple one-step calcination method. The as-prepared samples were characterized by means of X-ray diffraction patterns, scanning electron microscopy, high-angle annular dark-field scanning transmission electron microscopy, and Fourier transformed infrared spectroscopy. The results showed that g-C3N4 was formed both on the surface and within the interlayers of CsTi2NbO7, in which CsTi2NbO7 was in situ doped by nitrogen atoms to form N-CsTi2NbO7. The NTCN composite displayed higher electrocatalytic activity toward the detection of nitrite than pure CsTi2NbO7 and g-C3N4. The main reasons could be attributed to the synergistic effects of morphology engineering, N-doping, and layered heterojunction. The NTCN-based electrochemical sensor expressed a good linear relationship range from 0.0999 to 3.15 mmol/L with a detection limit of 2.63 × 10-5 mol/L. The good recovery, stability, and reproducibility of this biosensor showed the potential application in environmental monitoring.
- Publication:
-
Journal of Materials Research
- Pub Date:
- December 2018
- DOI:
- 10.1557/jmr.2018.354
- Bibcode:
- 2018JMatR..33.3936W