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Ionics - Two chemical bath deposition (CBD) solutions were prepared at two different temperatures of 60 and 80 °C for dye-sensitized solar cell (DSSC) application. The deposition time... 相似文献
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Eka Cahya Prima Mariya Al Qibtiya Brian Yuliarto Suyatman Hermawan Kresno Dipojono 《Ionics》2016,22(9):1687-1697
This work reports the novel contribution of chlorophyll b as natural anthocyanin co-pigment in unpurified black rice extract for improved electron transport and performance of natural dye-sensitized solar cell. The dyes are extracted as prominent photosensitizers by considering the concentration, the dye electronic structure, the extraction, and immersion time. The anthocyanin dye containing 1.92 mM cyanidin-3-O-glucoside structure has been extracted without purification. Interestingly, 0.33 mM chlorophyll b is found as a natural co-sensitizer in unpurified anthocyanin. The role of chlorophyll b supporting the electron transfer of anthocyanin dye will be investigated for improved cell performance. Both purified and unpurified dyes are compared in the same anthocyanin concentration. The combined Tauc plot and voltametric method will be conducted to show the interfacial electronic band edges of TiO2-dye-electrolyte. Electrochemical impedance spectroscopy method will investigate electron transfer dynamic in both cell systems. As a result, chlorophyll b has dominantly acted as two intermediate states in boosting electron injection and dye regeneration to improve cell efficiency from 1.31 to 2.17 % due to the narrower LUMO–TiO2 conduction band gap and the narrower HOMO-iodide (I ?) potential gap, respectively. According to the electron transport, the co-sensitizer contributes to the smaller transport resistance (R t?=?21.9 Ω), the higher chemical diffusion coefficient (Dn?=?1.696?×?10?3 cm2/s), the higher chemical capacitance (Cμ?=?14.32 μF), and the faster electron transport (τd?=?39.88 μs). 相似文献
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Indra Saptiama Dr. Yusuf Valentino Kaneti Prof. Brian Yuliarto Dr. Hiroaki Kumada Dr. Kunihiko Tsuchiya Dr. Yoshitaka Fujita Dr. Victor Malgras Dr. Nobuyoshi Fukumitsu Prof. Takeji Sakae Dr. Kentaro Hatano Prof. Katsuhiko Ariga Prof. Yoshiyuki Sugahara Prof. Yusuke Yamauchi 《Chemistry (Weinheim an der Bergstrasse, Germany)》2019,25(18):4843-4855
The effective utilization of various biomolecules for creating a series of mesoporous boehmite (γ-AlOOH) and gamma-alumina (γ-Al2O3) nanosheets with unique hierarchical multilayered structures is demonstrated. The nature and concentration of the biomolecules strongly influence the degree of the crystallinity, the morphology, and the textural properties of the resulting γ-AlOOH and γ-Al2O3 nanosheets, allowing for easy tuning. The hierarchical γ-AlOOH and γ-Al2O3 multilayered nanosheets synthesized by using biomolecules exhibit enhanced crystallinity, improved particle separation, and well-defined multilayered structures compared to those obtained without biomolecules. More impressively, these γ-AlOOH and γ-Al2O3 nanosheets possess high surface areas up to 425 and 371 m2 g−1, respectively, due to their mesoporous nature and hierarchical multilayered structure. When employed for molybdenum adsorption toward medical radioisotope production, the hierarchical γ-Al2O3 multilayered nanosheets exhibit Mo adsorption capacities of 33.1–40.8 mg g−1. The Mo adsorption performance of these materials is influenced by the synergistic combination of the crystallinity, the surface area, and the pore volume. It is expected that the proposed biomolecule-assisted strategy may be expanded for the creation of other 3D mesoporous oxides in the future. 相似文献
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