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Anatase TiO2 Nanoparticles with Exposed {001} Facets for Efficient Dye-Sensitized Solar Cells.

Chu L, Qin Z, Yang J, Li X - Sci Rep (2015)

Bottom Line: At the first-step hydrothermal reaction, H-titanate nanowires were obtained in NaOH solution with Ti powder, and at second-step hydrothermal reaction, anatase TiO2 nanoparticles with exposed {001} facets were formed in NH4F solution.If the second-step hydrothermal reaction was carried out in pure water, the H-titanate nanowires were decomposed into random shape anatase-TiO2 nanostructures, as well as few impurity of H2Ti8O17 phase and rutile TiO2 phase.Then, the as-prepared TiO2 nanostructures synthesized in NH4F solution and pure water were applied to the photoanodes of dye-sensitized solar cells (DSSCs), which exhibited power conversion efficiency (PCE) of 7.06% (VOC of 0.756 V, JSC of 14.80 mA/cm(2), FF of 0.631) and 3.47% (VOC of 0.764 V, JSC of 6.86 mA/cm(2), FF of 0.662), respectively.

View Article: PubMed Central - PubMed

Affiliation: School of Science, Nanjing University of Posts and Telecommunications (NUPT), Nanjing 210046, P. R. China.

ABSTRACT
Anatase TiO2 nanoparticles with exposed {001} facets were synthesized from Ti powder via a sequential hydrothermal reaction process. At the first-step hydrothermal reaction, H-titanate nanowires were obtained in NaOH solution with Ti powder, and at second-step hydrothermal reaction, anatase TiO2 nanoparticles with exposed {001} facets were formed in NH4F solution. If the second-step hydrothermal reaction was carried out in pure water, the H-titanate nanowires were decomposed into random shape anatase-TiO2 nanostructures, as well as few impurity of H2Ti8O17 phase and rutile TiO2 phase. Then, the as-prepared TiO2 nanostructures synthesized in NH4F solution and pure water were applied to the photoanodes of dye-sensitized solar cells (DSSCs), which exhibited power conversion efficiency (PCE) of 7.06% (VOC of 0.756 V, JSC of 14.80 mA/cm(2), FF of 0.631) and 3.47% (VOC of 0.764 V, JSC of 6.86 mA/cm(2), FF of 0.662), respectively. The outstanding performance of DSSCs based on anatase TiO2 nanoparticles with exposed {001} facets was attributed to the high activity and large special surface area for excellent capacity of dye adsorption.

No MeSH data available.


TEM and HRTEM images of the as-prepared samples.(a,b) H-titanate nanowires, (c, d) random shape TiO2 nanostructures obtained in pure water, (e,f) truncated octahedron TiO2 nanoparticles obtained in NH4F solution.
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f3: TEM and HRTEM images of the as-prepared samples.(a,b) H-titanate nanowires, (c, d) random shape TiO2 nanostructures obtained in pure water, (e,f) truncated octahedron TiO2 nanoparticles obtained in NH4F solution.

Mentions: The transmission electron microscopy (TEM) was used to further characterize the crystal structure and morphology of H2Ti5O11·H2O and TiO2 nanostrctures in Figure 3. Fig. 3(a,b) shows the H2Ti5O11·H2O nanowire sample. The lattice fringes with distances of 0.940 nm in the HRTEM image of Fig. 3(b) corresponded well with (200) plane of H2Ti5O11·H2O phase. Figure 3(c) shows TEM image of random shape TiO2 nanostructures by the further hydrothermal reaction in pure water. The HRTEM image (Fig. 3(d)) corresponding the dark red-box area shows interplanar spacing of 0.352 nm, which matches well with (101) plane of anatase TiO2. When the second-step hydrothemal reaction was taken in NH4F solution, the H2Ti5O11·H2O nanowires were decomposed into regular TiO2 nanopaticles (Fig. 3(e)). The HRTEM image corresponding the cyan-box area in Fig. 3(e) was revealed in Fig. 3(f), where the interplanar spacing of 0.192 and 0.237 nm corresponded to (200) and (004) planes of anatase TiO2, respectively. In addition, the (004) plane indicated the anatase TiO2 single crystal with exposed {001} facets, and the shape of anatase TiO2 was truncated octahedron. Further, the {101} facets could be also observed through TEM technique (Supplementary Information Fig. 2S).


Anatase TiO2 Nanoparticles with Exposed {001} Facets for Efficient Dye-Sensitized Solar Cells.

Chu L, Qin Z, Yang J, Li X - Sci Rep (2015)

TEM and HRTEM images of the as-prepared samples.(a,b) H-titanate nanowires, (c, d) random shape TiO2 nanostructures obtained in pure water, (e,f) truncated octahedron TiO2 nanoparticles obtained in NH4F solution.
© Copyright Policy - open-access
Related In: Results  -  Collection

License
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getmorefigures.php?uid=PMC4507182&req=5

f3: TEM and HRTEM images of the as-prepared samples.(a,b) H-titanate nanowires, (c, d) random shape TiO2 nanostructures obtained in pure water, (e,f) truncated octahedron TiO2 nanoparticles obtained in NH4F solution.
Mentions: The transmission electron microscopy (TEM) was used to further characterize the crystal structure and morphology of H2Ti5O11·H2O and TiO2 nanostrctures in Figure 3. Fig. 3(a,b) shows the H2Ti5O11·H2O nanowire sample. The lattice fringes with distances of 0.940 nm in the HRTEM image of Fig. 3(b) corresponded well with (200) plane of H2Ti5O11·H2O phase. Figure 3(c) shows TEM image of random shape TiO2 nanostructures by the further hydrothermal reaction in pure water. The HRTEM image (Fig. 3(d)) corresponding the dark red-box area shows interplanar spacing of 0.352 nm, which matches well with (101) plane of anatase TiO2. When the second-step hydrothemal reaction was taken in NH4F solution, the H2Ti5O11·H2O nanowires were decomposed into regular TiO2 nanopaticles (Fig. 3(e)). The HRTEM image corresponding the cyan-box area in Fig. 3(e) was revealed in Fig. 3(f), where the interplanar spacing of 0.192 and 0.237 nm corresponded to (200) and (004) planes of anatase TiO2, respectively. In addition, the (004) plane indicated the anatase TiO2 single crystal with exposed {001} facets, and the shape of anatase TiO2 was truncated octahedron. Further, the {101} facets could be also observed through TEM technique (Supplementary Information Fig. 2S).

Bottom Line: At the first-step hydrothermal reaction, H-titanate nanowires were obtained in NaOH solution with Ti powder, and at second-step hydrothermal reaction, anatase TiO2 nanoparticles with exposed {001} facets were formed in NH4F solution.If the second-step hydrothermal reaction was carried out in pure water, the H-titanate nanowires were decomposed into random shape anatase-TiO2 nanostructures, as well as few impurity of H2Ti8O17 phase and rutile TiO2 phase.Then, the as-prepared TiO2 nanostructures synthesized in NH4F solution and pure water were applied to the photoanodes of dye-sensitized solar cells (DSSCs), which exhibited power conversion efficiency (PCE) of 7.06% (VOC of 0.756 V, JSC of 14.80 mA/cm(2), FF of 0.631) and 3.47% (VOC of 0.764 V, JSC of 6.86 mA/cm(2), FF of 0.662), respectively.

View Article: PubMed Central - PubMed

Affiliation: School of Science, Nanjing University of Posts and Telecommunications (NUPT), Nanjing 210046, P. R. China.

ABSTRACT
Anatase TiO2 nanoparticles with exposed {001} facets were synthesized from Ti powder via a sequential hydrothermal reaction process. At the first-step hydrothermal reaction, H-titanate nanowires were obtained in NaOH solution with Ti powder, and at second-step hydrothermal reaction, anatase TiO2 nanoparticles with exposed {001} facets were formed in NH4F solution. If the second-step hydrothermal reaction was carried out in pure water, the H-titanate nanowires were decomposed into random shape anatase-TiO2 nanostructures, as well as few impurity of H2Ti8O17 phase and rutile TiO2 phase. Then, the as-prepared TiO2 nanostructures synthesized in NH4F solution and pure water were applied to the photoanodes of dye-sensitized solar cells (DSSCs), which exhibited power conversion efficiency (PCE) of 7.06% (VOC of 0.756 V, JSC of 14.80 mA/cm(2), FF of 0.631) and 3.47% (VOC of 0.764 V, JSC of 6.86 mA/cm(2), FF of 0.662), respectively. The outstanding performance of DSSCs based on anatase TiO2 nanoparticles with exposed {001} facets was attributed to the high activity and large special surface area for excellent capacity of dye adsorption.

No MeSH data available.