Browsing by Author "Liang, Ru-Meng"

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Effect of annealing on the electrodeposited Cu(2)O films for photoelectrochemical hydrogen generation
(2010-10-01)
Liang, Ru-Meng
;
Chang, Yun-Min
;
Wu, Pu-Wei
;
Lin, Pang
;
材料科學與工程學系
Cu(2)O films were electrodeposited on stainless steel substrates followed by Ar annealing for photoelectrochemical hydrogen generation. Plating variables including time and pH for the plating bath were explored to obtain desirable film qualities. X-ray diffraction (XRD) patterns indicated that the as-deposited Cu(2)O films exhibited preferred orientations in (200) and (111) planes from the plating bath of pH 9 and pH 11, respectively. Images from scanning electron microscope (SEM) revealed pyramid-like grains in 1 mu m size for the Cu(2)O films from pH 9 plating bath and large plate-like grains in 3-8 mu m size from pH 11 plating bath. Identical results from SEM and XRD were obtained from the Cu(2)O films at longer plating time. After annealing at 350 degrees C for 30 and 60 min, the Cu(2)O phase was nicely maintained but SEM images demonstrated coarser grains. Photoelectrochemical activity for H(2) generation was obtained on the Cu(2)O films before and after annealing by recording relevant photoelectrochemical currents at -0.3 V in 0.5 M aqueous Na(2)SO(4) solution. For the Cu(2)O films from both baths, substantial increments in photoelectrochemical current were observed for the annealed samples as opposed to as-deposited ones. The largest photoelectrochemical current was obtained at 0.143 mA/cm(2) from the Cu(2)O film of pH 9 plating bath with 60 min annealing, which exhibited a 560% increase over the as-deposited sample. We attributed the enhanced photoelectrochemical current to the improved crystallinity and reduced defects for the annealed Cu(2)O films. (C) 2010 Elsevier B.V. All rights reserved.
Effect of annealing on the electrodeposited Cu2O films for photoelectrochemical hydrogen generation
(2010-10-01)
Liang, Ru-Meng
;
Chang, Yun-Min
;
Wu, Pu-Wei
;
Lin, Pang
;
交大名義發表
Cu2O films were electrodeposited on stainless steel substrates followed by Ar annealing for photoelectrochemical hydrogen generation. Plating variables including time and pH for the plating bath were explored to obtain desirable film qualities. X-ray diffraction (XRD) patterns indicated that the as-deposited Cu2O films exhibited preferred orientations in (200) and (111) planes from the plating bath of pH 9 and pH 11, respectively. Images from scanning electron microscope (SEM) revealed pyramid-like grains in 1 mu m size for the Cu2O films from pH 9 plating bath and large plate-like grains in 3-8 mu m size from pH 11 plating bath. Identical results from SEM and XRD were obtained from the Cu2O films at longer plating time. After annealing at 350 degrees C for 30 and 60 min, the Cu2O phase was nicely maintained but SEM images demonstrated coarser grains. Photoelectrochemical activity for H-2 generation was obtained on the Cu2O films before and after annealing by recording relevant photoelectrochemical currents at -0.3 V in 0.5 M aqueous Na2SO4 solution. For the Cu2O films from both baths, substantial increments in photoelectrochemical current were observed for the annealed samples as opposed to as-deposited ones. The largest photoelectrochemical current was obtained at 0.143 mA/cm(2) from the Cu2O film of pH 9 plating bath with 60 min annealing, which exhibited a 560% increase over the as-deposited sample. We attributed the enhanced photoelectrochemical current to the improved crystallinity and reduced defects for the annealed Cu2O films. (C) 2010 Elsevier B.V. All rights reserved.
Electrochemical reduction of CO(2) by Cu(2)O-catalyzed carbon clothes
(2009-05-15)
Chang, Tin-Yu
;
Liang, Ru-Meng
;
Wu, Pu-Wei
;
Chen, Jing-Yu
;
Hsieh, Yu-Chi
Cu(2)O cubes with average edge lengths of 640 nm were prepared by a chemical reduction approach. The as-synthesized Cu(2)O particles were deposited on carbon clothes for electrochemical characterizations in cyclic voltammetry (CV) and potentiostatic measurements. In 0.5 M NaOH electrolytes saturated with N(2) or CO(2), both the Cu(2)O and carbon clothes were stable at the potential range of 0 to -1.7 V. Comparisons in the Current responses from the CV and potentiostatic measurements suggested the Cu(2)O with notable catalytic abilities for the CO(2) reduction. The mass activity was estimated at 0.94 mA/mg. Chemical analysis from gas chromatography confirmed the methanol to be the predominant product. (C) 2009 Elsevier B.V. All rights reserved.
Electrochemical reduction of CO2 by Cu2O-catalyzed carbon clothes
(2009-05-15)
Chang, Tin-Yu
;
Liang, Ru-Meng
;
Wu, Pu-Wei
;
Chen, Jing-Yu
;
Hsieh, Yu-Chi
Cu2O cubes with average edge lengths of 640 nm were prepared by a chemical reduction approach. The as-synthesized Cu2O particles were deposited on carbon clothes for electrochemical characterizations in cyclic voltammetry (CV) and potentiostatic measurements. In 0.5 M NaOH electrolytes saturated with N-2 or CO2, both the Cu2O and carbon clothes were stable at the potential range of 0 to -1.7 V. Comparisons in the Current responses from the CV and potentiostatic measurements suggested the Cu2O with notable catalytic abilities for the CO2 reduction. The mass activity was estimated at 0.94 mA/mg. Chemical analysis from gas chromatography confirmed the methanol to be the predominant product. (C) 2009 Elsevier B.V. All rights reserved.
Highly Efficient and Stable Inverted Polymer Solar Cells Integrated with a Cross-Linked Fullerene Material as an Interlayer
(2010-04-07)
Hsieh, Chao-Hsiang
;
Cheng, Yen-Ju
;
Li, Pei-Jung
;
Chen, Chiu-Hsiang
;
Dubosc, Martin
A novel PCBM-based n-type material, [6,6]-phenyl-C(61)-butyric styryl dendron ester (PCBSD). functionalized with a dendron containing two styryl groups as thermal cross-linkers, has been rationally designed and easily synthesized. In situ cross-linking of PCBSD was carried out by heating at a low temperature of 160 degrees C for 30 min to generate a robust, adhesive, and solvent-resistant thin film. This cross-linked network enables a sequential active layer to be successfully deposited on top of this interlayer to overcome the problem of interfacial erosion and realize a multilayer inverted device by all-solution processing. An inverted solar cell device based on an ITO/ZnO/C-PCBSD/P3HT:PCBM/PEDOT:PSS/Ag configuration not only achieves enhanced device characteristics, with an impressive PCE of 4.4%, but also exhibits an exceptional device lifetime without encapsulation; it greatly outperforms a reference device (PCE = 3.5%) based on an ITO/ZnO/P3HT:PCBM/PEDOT:PSS/Ag configuration without the interlayer. This C-PCBSD interlayer exerts multiple positive effects on both P3HT/C-PCBSD and PCBM/C-PCBSD localized heterojunctions at the interface of the active layer, including improved exciton dissociation efficiency, reduced charge recombination, decreased interface contact resistance, and induction of vertical phase separation to reduce the bulk resistance of the active layer as well as passivation of the local shunts at the ZnO interface. Moreover, this promising approach can be applied to another inverted solar cell, ITO/ZnO/C-PCBSD/PCPDTBT:PC(71)BM/PEDOT:PSS/Ag, using PCPDTBT as the p-type low-band-gap conjugated polymer to achieve an improved PCE of 3.4%. Incorporation of this cross-linked C(60) interlayer could become a standard procedure in the fabrication of highly efficient and stable multilayer inverted solar cells.