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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.


N 1 s (a) and W 4f (b) XPS spectra of WO3and NH3-treated WO3samples. The solid lines represent the measured data, and the dashed lines represent the Gaussian fitted curves.
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Fig2: N 1 s (a) and W 4f (b) XPS spectra of WO3and NH3-treated WO3samples. The solid lines represent the measured data, and the dashed lines represent the Gaussian fitted curves.

Mentions: However, as cubic tungsten nitride (WN, JCPDS no. 751012) and WOxNy (JCPDS No. 251254) have almost identical lattice structures and hence diffraction peaks in the XRD pattern, it is difficult to distinguish them only with XRD results [16-18]. Hence, the surface chemical element composition was studied by XPS. Figure 2a shows the N 1 s XPS spectra of WO3 and NH3-treated WO3 samples. In the condition of WO3, the low-intensity and relatively broad peak at 400.2 eV can be ascribed to the γ-N state caused by chemisorbed nitrogen molecules on the WO3 surface [19]. In the condition of NH3-treated WO3, the high-intensity peak at 396.9 eV can be observed, which corresponds to the β-N state and is essentially the atomic N [18,19], demonstrating that nitrogen has been successfully incorporated into the WO3.Figure 2


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)

N 1 s (a) and W 4f (b) XPS spectra of WO3and NH3-treated WO3samples. The solid lines represent the measured data, and the dashed lines represent the Gaussian fitted curves.
© Copyright Policy - open-access
Related In: Results  -  Collection

License
Show All Figures
getmorefigures.php?uid=PMC4385038&req=5

Fig2: N 1 s (a) and W 4f (b) XPS spectra of WO3and NH3-treated WO3samples. The solid lines represent the measured data, and the dashed lines represent the Gaussian fitted curves.
Mentions: However, as cubic tungsten nitride (WN, JCPDS no. 751012) and WOxNy (JCPDS No. 251254) have almost identical lattice structures and hence diffraction peaks in the XRD pattern, it is difficult to distinguish them only with XRD results [16-18]. Hence, the surface chemical element composition was studied by XPS. Figure 2a shows the N 1 s XPS spectra of WO3 and NH3-treated WO3 samples. In the condition of WO3, the low-intensity and relatively broad peak at 400.2 eV can be ascribed to the γ-N state caused by chemisorbed nitrogen molecules on the WO3 surface [19]. In the condition of NH3-treated WO3, the high-intensity peak at 396.9 eV can be observed, which corresponds to the β-N state and is essentially the atomic N [18,19], demonstrating that nitrogen has been successfully incorporated into the WO3.Figure 2

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.