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NH3-treated WO3 as low-cost and efficient counter electrode for dye-sensitized solar cells.

Song D, Chen Z, Cui P, Li M, Zhao X, Li Y, Chu L - Nanoscale Res Lett (2015)

Bottom Line: Correspondingly, the power conversion efficiency (PCE) of the DSC is significantly increased from 0.9% for pristine WO3 CE to 5.9% for NH3-treated WO3 CE.In addition, it is also shown that NH3 treatment is more efficient than H2 or N2 treatment in enhancing the catalytic performance of WO3 CE.This work highlights the potential of NH3-treated WO3 for the application in DSCs and provides a facile method to get highly efficient and low-cost CEs from catalytic inert metal oxides.

View Article: PubMed Central - PubMed

Affiliation: State Key Laboratory of Alternate Electrical Power System with Renewable Energy Sources, School of Renewable Energy, North China Electric Power University, No. 2 Beinong Rd, Changping, Beijing, 102206 China.

ABSTRACT
A novel low-cost and efficient counter electrode (CE) was obtained by treating catalytic inert tungsten trioxide (WO3) nanomaterial in NH3 atmosphere at elevated temperatures. The formation of tungsten oxynitride from WO3 after NH3 treatment, as evidenced by X-ray photoelectron spectroscopy and X-ray diffraction, increases the catalytic activity of the CE. Correspondingly, the power conversion efficiency (PCE) of the DSC is significantly increased from 0.9% for pristine WO3 CE to 5.9% for NH3-treated WO3 CE. The photovoltaic performance of DSC using NH3-treated WO3 CE is comparable to that of DSC using standard Pt CE (with a PCE of 6.0%). In addition, it is also shown that NH3 treatment is more efficient than H2 or N2 treatment in enhancing the catalytic performance of WO3 CE. This work highlights the potential of NH3-treated WO3 for the application in DSCs and provides a facile method to get highly efficient and low-cost CEs from catalytic inert metal oxides.

No MeSH data available.


SEM images (a, b) and EDS spectra (c, d) of WO3CE and NH3-treated WO3CE. Insets in (c) and (d) are the corresponding detailed elemental distribution.
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Fig3: SEM images (a, b) and EDS spectra (c, d) of WO3CE and NH3-treated WO3CE. Insets in (c) and (d) are the corresponding detailed elemental distribution.

Mentions: The morphology of the two different WO3 CEs was also characterized by SEM. Figure 3a,b presents the top-view SEM images of WO3 and NH3-treated WO3 CE, respectively. It is clear that these two CEs are both porous which is useful for the diffusion of iodide/triiodide redox couples in the films. The EDS patterns shown in Figure 3c,d from these two CEs are quite different. No signal of N can be observed in WO3 CE (Figure 3c), while the signal of N is obvious in NH3-treated WO3 (Figure 3d). In addition, the atomic ratio of O to W is decreased from 3.19 to 1.05 by NH3 treatment, suggesting that the oxygen sites are partially substituted by nitrogen atoms in reductive NH3 atmosphere.Figure 3


NH3-treated WO3 as low-cost and efficient counter electrode for dye-sensitized solar cells.

Song D, Chen Z, Cui P, Li M, Zhao X, Li Y, Chu L - Nanoscale Res Lett (2015)

SEM images (a, b) and EDS spectra (c, d) of WO3CE and NH3-treated WO3CE. Insets in (c) and (d) are the corresponding detailed elemental distribution.
© Copyright Policy - open-access
Related In: Results  -  Collection

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Fig3: SEM images (a, b) and EDS spectra (c, d) of WO3CE and NH3-treated WO3CE. Insets in (c) and (d) are the corresponding detailed elemental distribution.
Mentions: The morphology of the two different WO3 CEs was also characterized by SEM. Figure 3a,b presents the top-view SEM images of WO3 and NH3-treated WO3 CE, respectively. It is clear that these two CEs are both porous which is useful for the diffusion of iodide/triiodide redox couples in the films. The EDS patterns shown in Figure 3c,d from these two CEs are quite different. No signal of N can be observed in WO3 CE (Figure 3c), while the signal of N is obvious in NH3-treated WO3 (Figure 3d). In addition, the atomic ratio of O to W is decreased from 3.19 to 1.05 by NH3 treatment, suggesting that the oxygen sites are partially substituted by nitrogen atoms in reductive NH3 atmosphere.Figure 3

Bottom Line: Correspondingly, the power conversion efficiency (PCE) of the DSC is significantly increased from 0.9% for pristine WO3 CE to 5.9% for NH3-treated WO3 CE.In addition, it is also shown that NH3 treatment is more efficient than H2 or N2 treatment in enhancing the catalytic performance of WO3 CE.This work highlights the potential of NH3-treated WO3 for the application in DSCs and provides a facile method to get highly efficient and low-cost CEs from catalytic inert metal oxides.

View Article: PubMed Central - PubMed

Affiliation: State Key Laboratory of Alternate Electrical Power System with Renewable Energy Sources, School of Renewable Energy, North China Electric Power University, No. 2 Beinong Rd, Changping, Beijing, 102206 China.

ABSTRACT
A novel low-cost and efficient counter electrode (CE) was obtained by treating catalytic inert tungsten trioxide (WO3) nanomaterial in NH3 atmosphere at elevated temperatures. The formation of tungsten oxynitride from WO3 after NH3 treatment, as evidenced by X-ray photoelectron spectroscopy and X-ray diffraction, increases the catalytic activity of the CE. Correspondingly, the power conversion efficiency (PCE) of the DSC is significantly increased from 0.9% for pristine WO3 CE to 5.9% for NH3-treated WO3 CE. The photovoltaic performance of DSC using NH3-treated WO3 CE is comparable to that of DSC using standard Pt CE (with a PCE of 6.0%). In addition, it is also shown that NH3 treatment is more efficient than H2 or N2 treatment in enhancing the catalytic performance of WO3 CE. This work highlights the potential of NH3-treated WO3 for the application in DSCs and provides a facile method to get highly efficient and low-cost CEs from catalytic inert metal oxides.

No MeSH data available.