| 411. |
- Liu, X.R., et al.
(författare)
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Sulphate-ceria composite ceramics for energy environmental co-generation technology
- 2005
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Ingår i: HIGH-PERFORMANCE CERAMICS III, PTS 1 AND 2. - 0878499598 ; , s. 425-430
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Konferensbidrag (refereegranskat)abstract
- In this work ion conductivity and FC application were studied for the new type composite material based on SDC (samariurn doped ceria) and Li2SO4. Significant conductivity enhancement was achieved, e.g. 10(-2) - 0.4 Scm(-1) for the SDC-Li2SO4 compared to 10(-4) -10(-2) Scm(-1) for the SDC between 400 and 650degreesC. Some ion conductivity mechanisms were proposed correspondingly. Using the SDC-Li2SO4 composite materials as the electrolytes, we achieved high performances, 200-540 mWcm(-2). for intennediate temperature (450-650degreesC) solid oxide FC (ITSOFC) applications. Sulfates, typically Li2SO4, have an excellent chemical stability in sulfur containing atmosphere. The sulfate-ceria (SDC-Li2SO4) Composite materials can thus meet the demands to develop the sulfur tolerant and H2S FC technologies, which was also demonstrated successfully with significant importance for both fundamental and applied research.
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| 412. |
- Mao, L., et al.
(författare)
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Introducing chenodeoxycholic acid coadsorbent and strong electron-withdrawing group in indoline dyes to design high-performance solar cells : A remarkable theoretical improvement
- 2021
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Ingår i: Journal of Materials Chemistry C. - : Royal Society of Chemistry (RSC). - 2050-7526 .- 2050-7534. ; 9:17, s. 5800-5807
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Tidskriftsartikel (refereegranskat)abstract
- The addition of coadsorbents and the introduction of electron-withdrawing groups in dye sensitizers are considered feasible strategies for improving the power conversion efficiency (PCE) of dye-sensitized solar cells (DSSCs). However, facile and precise predictions of the influence of these two strategies on their photovoltaic properties, including PCE, are challenging. In this contribution, we studied a known D-A-π-A indoline dye WS-2 adsorbed on a TiO2 anode represented by a supercell model. The PCE of this dye was evaluated to be between 9.69% and 13.70%, depending on the supercell representation, compared with an experimental value of 8.55%. The PCE could be increased to 16.39% on a moderate supercell by adding chenodeoxycholic acid (CDCA) as a coadsorbent. Such an enhancement could be ascribed to the intermolecular interaction between WS-2 and CDCA, suppressing excessively high dye coverage and thereby resulting in a remarkable increase in the open-circuit voltage. Based on WS-2, a new molecule WS-2a was rationally designed by substituting the benzothiadiazole moiety of WS-2 with a stronger electron-withdrawing thienyl-diketopyrrolopyrrole group. Consequently, the maximum absorption band showed a large red-shift from 522 to 638 nm, broadening the spectral response into the near-infrared region. A higher PCE of 16.62% was obtained for WS-2a. Moreover, the coadsorption of WS-2a and CDCA onto the TiO2 supercell achieved the best photovoltaic efficiency with a value as high as 24.15%. Therefore, the present study quantitatively reveals the impact of the coadsorbent and electron-withdrawing groups on the optoelectronic properties of dyes, which opens a new avenue to design high-efficiency D-A-π-A-structured organic sensitizers for promising DSSC applications. A discussion on the qualification of these results is given.
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| 413. |
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| 414. |
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| 415. |
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| 416. |
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| 417. |
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| 418. |
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| 419. |
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| 420. |
- Nestor, Stephen T., et al.
(författare)
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Studies on solubility and S-alkylation of 2-thiouracil in ionic liquids
- 2018
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Ingår i: Journal of Molecular Liquids. - : Elsevier. - 0167-7322 .- 1873-3166. ; 265, s. 463-467
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Tidskriftsartikel (refereegranskat)abstract
- Ionic liquids have been exploited to assist dissolution of poorly soluble (and poorly bioavailable) drugs, enhancing permeation through physiological barriers to deliver drugs to target sites. Herein, the solubility of 6-methyl-2-thiouracil - a common antithyroid drug, with low solubility in water and common organic solvents- was studied by employing six different imidazolium-based ionic liquids with variable anions. We demonstrate facile, regiospecific S-alkylation of 2-thiouracil with various lipophilic side chains in high yields (91-94%) and in the absence of catalysts. The reaction yields are correlated with the H-bond formation ability between the ILs' anions and the solute, indicating that the hydrogen bond is perhaps responsible for the high solubility of 2-thiouracil in [C(2)mim][OAc] and [C(2)mim][Cl].
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