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Few-layer MoSe₂ possessing high catalytic activity towards iodide/tri-iodide redox shuttles.

Lee LT, He J, Wang B, Ma Y, Wong KY, Li Q, Xiao X, Chen T - Sci Rep (2014)

Bottom Line: Here we present a new application in dye-sensitized solar cell as catalyst for the reduction of I₃(-) to I(-) at the counter electrode.In this electrode, Mo film is found to significantly decrease the sheet resistance of the counter electrode, contributing to the excellent device performance.Since all of the elements in the electrode are of high abundance ratios, this type of electrode is promising for the fabrication of large area devices at low materials cost.

View Article: PubMed Central - PubMed

Affiliation: Department of Physics, The Chinese University of Hong Kong, Shatin N. T., Hong Kong, P. R. China.

ABSTRACT
Due to the two-dimensional confinement of electrons, single- and few-layer MoSe₂ nanostructures exhibit unusual optical and electrical properties and have found wide applications in catalytic hydrogen evolution reaction, field effect transistor, electrochemical intercalation, and so on. Here we present a new application in dye-sensitized solar cell as catalyst for the reduction of I₃(-) to I(-) at the counter electrode. The few-layer MoSe₂ is fabricated by surface selenization of Mo-coated soda-lime glass. Our results show that the few-layer MoSe₂ displays high catalytic efficiency for the regeneration of I(-) species, which in turn yields a photovoltaic energy conversion efficiency of 9.00%, while the identical photoanode coupling with "champion" electrode based on Pt nanoparticles on FTO glass generates efficiency only 8.68%. Thus, a Pt- and FTO-free counter electrode outperforming the best conventional combination is obtained. In this electrode, Mo film is found to significantly decrease the sheet resistance of the counter electrode, contributing to the excellent device performance. Since all of the elements in the electrode are of high abundance ratios, this type of electrode is promising for the fabrication of large area devices at low materials cost.

No MeSH data available.


Related in: MedlinePlus

Scalable fabrication of the MoSe2–based counter electrode.(a) Digital photo of the as-prepared counter electrode with area of 100 mm × 10 mm; (b−d) SEM images of the large-area counter electrodes from different sites. Photograph in part (a) courtesy of Bokai Zhang.
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f5: Scalable fabrication of the MoSe2–based counter electrode.(a) Digital photo of the as-prepared counter electrode with area of 100 mm × 10 mm; (b−d) SEM images of the large-area counter electrodes from different sites. Photograph in part (a) courtesy of Bokai Zhang.

Mentions: The scalability of Mo-coated soda-lime glass preparation has been well-established in the CIGS solar technologies. This lays the ground for the large-area fabrication of few-layer MoSe2 CE via the direct selenization. Herein, we performed initial attempt to fabricate a rectangular electrode with surface parameter of 100 mm × 10 mm (Figure 5). The selenization in isothermal tube furnace ensures the identical morphology throughout the Mo substrate (Figure 5b–d and S6), and the uniformity and crack-free surface was shown in the low magnification SEM images (Figure S7). The CE's stability in the I−/I3− system is preliminarily examined by consecutive CV scanning for 20 cycles. It turns out that the CV curves do not show obvious changes, indicating that the MoSe2 CE could resist the electrolyte corrosion and the applied potential (Figure S8). Furthermore, the devices fabricated with the electrodes from different areas exhibit resemble performance, manifesting the scalability.


Few-layer MoSe₂ possessing high catalytic activity towards iodide/tri-iodide redox shuttles.

Lee LT, He J, Wang B, Ma Y, Wong KY, Li Q, Xiao X, Chen T - Sci Rep (2014)

Scalable fabrication of the MoSe2–based counter electrode.(a) Digital photo of the as-prepared counter electrode with area of 100 mm × 10 mm; (b−d) SEM images of the large-area counter electrodes from different sites. Photograph in part (a) courtesy of Bokai Zhang.
© Copyright Policy - open-access
Related In: Results  -  Collection

License
Show All Figures
getmorefigures.php?uid=PMC3924216&req=5

f5: Scalable fabrication of the MoSe2–based counter electrode.(a) Digital photo of the as-prepared counter electrode with area of 100 mm × 10 mm; (b−d) SEM images of the large-area counter electrodes from different sites. Photograph in part (a) courtesy of Bokai Zhang.
Mentions: The scalability of Mo-coated soda-lime glass preparation has been well-established in the CIGS solar technologies. This lays the ground for the large-area fabrication of few-layer MoSe2 CE via the direct selenization. Herein, we performed initial attempt to fabricate a rectangular electrode with surface parameter of 100 mm × 10 mm (Figure 5). The selenization in isothermal tube furnace ensures the identical morphology throughout the Mo substrate (Figure 5b–d and S6), and the uniformity and crack-free surface was shown in the low magnification SEM images (Figure S7). The CE's stability in the I−/I3− system is preliminarily examined by consecutive CV scanning for 20 cycles. It turns out that the CV curves do not show obvious changes, indicating that the MoSe2 CE could resist the electrolyte corrosion and the applied potential (Figure S8). Furthermore, the devices fabricated with the electrodes from different areas exhibit resemble performance, manifesting the scalability.

Bottom Line: Here we present a new application in dye-sensitized solar cell as catalyst for the reduction of I₃(-) to I(-) at the counter electrode.In this electrode, Mo film is found to significantly decrease the sheet resistance of the counter electrode, contributing to the excellent device performance.Since all of the elements in the electrode are of high abundance ratios, this type of electrode is promising for the fabrication of large area devices at low materials cost.

View Article: PubMed Central - PubMed

Affiliation: Department of Physics, The Chinese University of Hong Kong, Shatin N. T., Hong Kong, P. R. China.

ABSTRACT
Due to the two-dimensional confinement of electrons, single- and few-layer MoSe₂ nanostructures exhibit unusual optical and electrical properties and have found wide applications in catalytic hydrogen evolution reaction, field effect transistor, electrochemical intercalation, and so on. Here we present a new application in dye-sensitized solar cell as catalyst for the reduction of I₃(-) to I(-) at the counter electrode. The few-layer MoSe₂ is fabricated by surface selenization of Mo-coated soda-lime glass. Our results show that the few-layer MoSe₂ displays high catalytic efficiency for the regeneration of I(-) species, which in turn yields a photovoltaic energy conversion efficiency of 9.00%, while the identical photoanode coupling with "champion" electrode based on Pt nanoparticles on FTO glass generates efficiency only 8.68%. Thus, a Pt- and FTO-free counter electrode outperforming the best conventional combination is obtained. In this electrode, Mo film is found to significantly decrease the sheet resistance of the counter electrode, contributing to the excellent device performance. Since all of the elements in the electrode are of high abundance ratios, this type of electrode is promising for the fabrication of large area devices at low materials cost.

No MeSH data available.


Related in: MedlinePlus