Journal
ACS APPLIED MATERIALS & INTERFACES
Volume 6, Issue 3, Pages 2118-2124Publisher
AMER CHEMICAL SOC
DOI: 10.1021/am405231p
Keywords
nitrogen-doped TiO2; graphene; graphene nanohybrids; pi-pi stacking; counter electrode; dye-sensitized solar cells
Funding
- National Natural Science Foundation of China [51173087, 21207073]
- Australia Research Council [130104759]
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The preparation of nitrogen-doped TiO2/graphene nanohybrids and their application as counter electrode for dye-sensitized solar cell (DSSC) are presented. These nanohybrids are prepared by self-assembly of pyrene modified H2Ti3O7 nanosheets and graphene in aqueous medium via pi-pi stacking interactions, followed by thermal calcination at different temperatures in ammonia atmosphere to afford nitrogen-doped TiO2/graphene nanohybrids. H2Ti3O7 nanosheets were synthesized from TiOSO4 center dot xH(2)O by a hydrothermal reaction at 150 degrees C for 48 h. The microstructure of the obtained mixed-phase nanohybrids was characterized by transmission electron microscopy (TEM), Xray diffraction (XRD), X-ray photoelectron spectroscopy (XPS), and Fourier transforms infrared spectroscopy (FTIR). Moreover, the performances of the as-prepared nanohybrids as counter electrode materials for DSSC was investigated, and the results indicated that the nanohybrids prepared at higher nitridation temperature would lead to higher short-circuit current density than those prepared at lower nitridation temperature, indicating that it can be utilized as a low-cost alternative to Pt for DSSCs and other applications.
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