Browsing by Author "Hsu, Hsin-Ling"

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Dye-sensitized solar cells based on agarose gel electrolytes using allylimidazolium iodides and environmentally benign solvents
(2013-02-28)
Hsu, Hsin-Ling
;
Tien, Cheng-Fang
;
Yang, Ya-Ting
;
Leu, Jihperng
;
材料科學與工程學系
Novel agarose gel electrolytes are prepared by allylimidazolium iodides-based ionic liquids and environmentally benign co-solvents (propylene carbonate (PC) and dimethyl sulfoxide (DMSO)) for dye-sensitized solar cells (DSSCs). Among 1-allyl-3-ethylimidadolium iodide (AEII), 1-allyl-3-propylimidazolium iodide (APII), 1-3-diallylimidazolium iodide (DAM, and 1-methyl-3-propylimidazolium iodide (MPII) ionic liquids, the agarose gel electrolyte containing AEII exhibits the best DSSC performance. The efficiency of the DSSC using the agarose gel electrolyte containing 1.5 M AEII and 0.65 wt% agarose is 5.89% with the highest I-3(-) diffusion coefficient of 7.7 x 10(-6) cm(2) s(-1). The performance of the AEII ionic liquid-based agarose gel electrolyte is comparable to the liquid electrolyte based on 3-methoxypropionitrile (MPN) (5.84%) under illumination at AM 1.5, 100 mW cm(-2). Moreover, the DSSC performance of the allylimidazolium iodides ionic liquid-based agarose electrolyte is determined by the interaction between ionic liquid and agarose, which affects the rigidity of the ion channels and the I-3(-) diffusion coefficient. (C) 2013 Elsevier Ltd. All rights reserved.
Effect of pore size/distribution in TiO2 films on agarose gel electrolyte-based dye-sensitized solar cells
(2014-06-01)
Hsu, Hsin-Ling
;
Tien, Cheng-Fang
;
Leu, Jihperng
;
材料科學與工程學系
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Department of Materials Science and Engineering
This study develops a simple method to change the distribution of the pore size in a TiO2 layer, using polyethylene glycol (PEG), while maintaining nearly the same surface area and porosity to clarify how large pores affect the performance of dye-sensitized solar cells (DSSCs). Specifically, a heating step at 100 A degrees C for a specific duration is added prior to PEG removal and TiO2 sintering at 400 A degrees C. This process transforms the role of the PEG from a surfactant to a pore generator (porogen) and forms larger pores, depending on the loading and aggregation time for the PEG to gain larger pores. The effect of larger pores in TiO2 films under 30 % PEG loading, on the performance of an agarose gel electrolyte-based DSSC, was further investigated using the ionic liquid, 1-allyl-3-ethylimidazolium iodide (AEII). The I-V characteristic and the electrochemical impedance spectroscopy analysis show that larger pores readily improve redox couple diffusion in a TiO2 porous electrode and modify the interface between electrolyte and TiO2. Using the optimized TiO2 film with larger pores (30 % PEG loading, 100 A degrees C/60 min), an efficiency of 7.43 % is achieved for the agarose gel electrolyte-based DSSC, which represents a 26.1 % improvement over TiO2 without the addition of PEG.
Effects of environmentally benign solvents in the agarose gel electrolytes on dye-sensitized solar cells
(2011-07-01)
Hsu, Hsin-Ling
;
Hsu, Wan-Ting
;
Leu, Jihperng
;
材料科學與工程學系
;
Department of Materials Science and Engineering
The ionic agarose gel electrolytes are prepared by using environmental benign solvents and co-solvents to improve the agarose solubility and capacities of the additives for dye-sensitized solar cells. The effects of single solvents (dimethyl sulfoxide (DMSO), propylene carbonate (PC), propylene glycol, triethylene glycol, and tetraethylene glycol) and DMSO-based co-solvents are examined on the conductivities, diffusion coefficients of triiodide, and energy conversion efficiencies. The highest conductivity, 14.2 mS cm(-1), and the highest diffusion coefficient of triiodide, 2.7 x 10(-6) cm(2) s(-1), are achieved for the electrolyte containing the co-solvent of 80 vol.% PC and 20 vol.% DMSO. The environmental benign co-solvent such as DMSO/PC can significantly increase the conversion efficiency to 3.4% with agarose compared to pure MPII with agarose (1.4%), while retaining similar to 80% of the energy conversion efficiencies of the reference cell without agarose under the illumination at AM 1.5, 100 mW cm(-2). (C) 2011 Elsevier Ltd. All rights reserved.
METHOD FOR FORMING A POROUS MATERIAL
(2009-12-31)
Leu, Jih-Perng
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Hsu, Kuo-Yuan
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Hsu, Hsin-Ling
;
Chen, Guan-Yu
;
Takasaka, Nobuo
A method for forming a porous material is to mix a porous first basic material with a sacrificial material compatible with the first basic material to let the sacrificial material permeate into the pores of the first basic material to form a first finished product. Subsequently, the first finished product is mixed with a second basic material and heated over the vaporization temperature of the sacrificial material to let the ingredients of the second basic material change and increase viscous force and impossible to enter the pores of the first basic material. Simultaneously, the sacrificial material is heated and vaporized to exhaust out of the pores of the first basic material, disabling the second basic material to permeate into the pores of the first basic material and thus forming a second finished product for reserving the ingredients in the pores of the first basic material.
TiO2 Nanowires on Anodic TiO2 Nanotube Arrays (TNWs/TNAs): Formation Mechanism and Photocatalytic Performance
(2012)
Hsu, Ming-Yi
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Hsu, Hsin-Ling
;
Leu, Jihperng
;
材料科學與工程學系
;
Department of Materials Science and Engineering
TiO2 nanowires connected directly with TiO2 nanotubes arrays (TNWs/TNAs) were successfully fabricated with a mixture of ethylene glycol and water that contained NH4F electrolyte via a one-step method without mechanical stirring. The morphology of the TNWs/TNAs structure was investigated by changing the anodizing voltage and processing time to elucidate its formation mechanism. Well-developed anodic oxide nanowires are only observed under specific anodizing voltage and processing time conditions. The evolution of TNWs follows four stages: (1) thinning of the tube wall thickness with high roughness near the TNA mouths, (2) forming strings of through holes in the upper section of the TNAs, (3) splitting into nanowires, and (4) collapsing and further thinning of nanowires. For photocatalytic application, TNWs/TNAs film demonstrated a better photocatalytic performance than regular TNAs due to higher surface area predominantly and improved charge transport. Moreover, TNWs/TNAs film (20 nm wire/40 nm pore diameter) achieved a performance comparable to that of the film made from TiO2 nanoparticles. (C) 2012 The Electrochemical Society. [DOI: 10.1149/2.063208jes] All rights reserved.