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In Situ Synthesis of Mixed-Phase WO3 on Nitrogen-Doped Graphene with Enhanced Photoelectric Properties.
- Source :
- ACS Applied Nano Materials; 9/22/2023, Vol. 6 Issue 18, p16805-16814, 10p
- Publication Year :
- 2023
-
Abstract
- WO<subscript>3</subscript>/N-rGO composites with a phase-junction structure were prepared by hydrothermal methods. The formation of orthorhombic and monoclinic WO<subscript>3</subscript> during the in situ synthesis of WO<subscript>3</subscript> on nitrogen-doped graphene was demonstrated by X-ray diffraction (XRD). X-ray photoelectron spectroscopy (XPS) and Fourier transform infrared spectroscopy (FT-IR) results demonstrated the successful doping of nitrogen atoms in graphene. The effect of N-rGO and phase-junction structure on the photoelectric properties was investigated by photoelectrochemical tests. In the I–t test results, WO<subscript>3</subscript>/N-rGO exhibited a photocurrent density of 0.204 mA/cm<superscript>2</superscript>, which was 5.8 and 2.6 times higher than those of WO<subscript>3</subscript> and WO<subscript>3</subscript>/rGO, respectively. The electrochemical impedance spectroscopy (EIS) demonstrated that N-rGO and phase-junction structure reduce the electrochemical impedance of the composites. In the linear sweep voltammetry (LSV) and Mott–Schottky (MS) results, WO<subscript>3</subscript>/N-rGO exhibited the highest photocurrent (3.65 mA/cm<superscript>2</superscript>) intensity at 1.23 V bias and the largest carrier density (3.63 × 10<superscript>20</superscript> cm<superscript>–3</superscript>), respectively. Possible electron-transfer mechanisms of the composite materials also have been discussed. [ABSTRACT FROM AUTHOR]
Details
- Language :
- English
- ISSN :
- 25740970
- Volume :
- 6
- Issue :
- 18
- Database :
- Complementary Index
- Journal :
- ACS Applied Nano Materials
- Publication Type :
- Academic Journal
- Accession number :
- 172324669
- Full Text :
- https://doi.org/10.1021/acsanm.3c03002