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采用溶胶 凝胶、浆体涂敷、磁控溅射等方法制备了二氧化钛单层以及多层膜.通过透射电镜、扫描电镜以及X射线衍射实验分析了不同薄膜的结构.通过比较不同薄膜制作的染料敏化太阳电池性能探讨了薄膜结构的影响.实验所获得的电池开路电压可达708mV,短路电流可达13.26mA(电池面积为1.8cm2). 相似文献
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用光电化学方法研究了不对称菁类染料敏化TiO2纳米结构电极的光电转换过程.结果表明,该染料的电子激发态能级位置与TiO2纳米粒子导带边位置匹配较好,光激发染料后,其激发态电子可以注入到TiO2纳米多孔膜的导带,从而使TiO2纳米结构电极的吸收光谱和光电流谱红移至可见光区,其 IPCE(Incident photon-to-electron conversion efficiency)值最高可达84.3%.并进一步结合现场紫外-可见吸收光谱研究了外加电势对激发态染料往TiO2纳米多孔膜注入电子过程的影响. 相似文献
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菁类染料敏化的固态纳米TiO2光电化学电池 总被引:12,自引:0,他引:12
染料敏化TiO2光电化学电池具有较高的能量转换效率,价格仅为传统单晶硅太阳能电池的1/10,成为半导体光电化学领域的研究热点^[1-4]。但该类电池内的电解液可流动,造成电池密封困难,限制其实用化。针对这一问题,采用无机p-型半导体材料^[5,6]和高分子导体等电解液替代物组装固态光电化学电池成为该领域的新的研究方向^[7-9]。我们^[10]用凝胶网络高分子电解质组装成固态电池,取得了令人满意的结果。电池中原使用的敏化剂是顺二硫氰根-双(2,2′-联吡啶-4,4′-二羧酸)合钌(Ⅱ)(cis-bis)(thiocyanato)bis(2,2′-bipyridyl-4,4′-dicarboxylate)ruthenium(Ⅱ),其价格昂贵,合成路线复杂。本文用自合成的、价格低廉的纯有机不对称菁类染料(Cyanine dye,以下简称为CD)敏化TiO2电极和基于聚氧乙烯(PEO)的凝胶网络高分子电解质组装成固态电池,并研究了所得固态电池的光电转换性能。 相似文献
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研究了Ho3+离子表面修饰对TiO2纳米晶电极光电性能的影响.TiO2表面氧化钬的存在一方而降低了染料和TiO2之间的电子注入速率,而另一方面它也能够抑制电荷复合.结果表明,在TiO2纳米晶薄膜表面修饰一定厚度的HO3+离子层,在电极表面就形成了一个势垒,能够有效抑制电极表面的电荷复合,从而提高了染料敏化太阳能电池的光电压和光电转化效率.在93.1 mW·cm-2白光照射下,TiO2/Ho-0.1和TiO2/Ho-0.2(0.1和0.2分别是修饰TjO2电极的Ho3+液的浓度,单位是mol·L-1)两个电极的光电转化效率分别达到8.3%和7.6%,与TiO2电极(7.2%)比较,分别增大了15%和5%. 相似文献
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研究了Ho3+离子表面修饰对TiO2纳米晶电极光电性能的影响. TiO2表面氧化钬的存在一方面降低了染料和TiO2之间的电子注入速率, 而另一方面它也能够抑制电荷复合. 结果表明, 在TiO2纳米晶薄膜表面修饰一定厚度的Ho3+离子层, 在电极表面就形成了一个势垒, 能够有效抑制电极表面的电荷复合, 从而提高了染料敏化太阳能电池的光电压和光电转化效率. 在93.1 mW·cm-2白光照射下, TiO2/Ho-0.1 和TiO2/Ho-0.2(0.1 和0.2分别是修饰TiO2电极的Ho3+溶液的浓度, 单位是mol·L-1)两个电极的光电转化效率分别达到8.3%和7.6%, 与TiO2电极(7.2%)比较, 分别增大了15%和5%. 相似文献
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用光电流作用谱、光电流-电势图等光电化学方法研究了ITO/3-甲基噻吩和2-噻吩甲酸共聚物(CTCMT)膜电极和ITO/TiO2/CTCMT复合膜电极的光电转换性质.结果表明,CTCMT膜为p型半导体,禁带宽度为2.36eV,价带位置为-5.52eV.在ITO/TiO2/CTCMT复合膜电极中存在p-n异质结,在一定条件下异质结的存在有利于光生电子-空穴对的分离.CTCMT膜修饰ITO/TiO2电极可使光电流增强,光电流起始波长红移至600nm以上,使宽禁带半导体电极的光电转换效率得到改善. 相似文献
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N,N′-对羧苄基吲哚三菁敏化纳米TiO2电极的研究 总被引:1,自引:0,他引:1
应用光电化学方法研究了N, N′-对羧苄基吲哚三菁(Cy5)染料敏化TiO2纳米晶电极的光电化学行为,优化了敏化的条件.结合Cy5的循环伏安曲线和光吸收阈值,初步确定Cy5电子基态和激发态能级位置.结果表明,Cy5电子激发态能级位置能与TiO2纳米粒子导带边位置相匹配,因而使用该染料敏化可以显著提高TiO2纳米晶的光电流,使TiO2纳米晶电极吸收波长由紫外光区红移至可见光区和近红外区,光电转换效率得到明显改善,在膜厚为6.5μm、敏化时间为6 h的条件下IPCE值(incident photo-to-electricity conversion efficiency)最高可达46.4%,总的光电转换效率η为1.70%. 相似文献
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Weiwei Tan Jinmao Chen Xiaowen Zhou Jingbo Zhang Yuan Lin Xueping Li Xurui Xiao 《Journal of Solid State Electrochemistry》2009,13(5):651-656
The electrophoretic deposition combined with common pressure hydrothermal treatment was employed to prepare nanocrystalline
TiO2 thin film from suspension of tetra-n-butyl titanate and P25 at low temperature. The tetra-n-butyl titanate was hydrolyzed and crystallized into anatase to interconnect nanocrystalline TiO2 particles and to stick them to a conductive substrate by common pressure hydrothermal treatment to improve the electron transport
properties of the deposited thin film. A dye-sensitized solar cell based on TiO2 thin film prepared by the low temperature method yielded the conversion efficiency of 6.12%. Due to the relative slower electron
transport rate in the deposited film, its conversion efficiency was slightly lower than that of the cell with TiO2 thin film prepared by the conventional high temperature sintering method. Since it is free of high temperature sintering
step, this method can be used to prepare nanocrystalline TiO2 thin film on plastic polymer conductive substrate for fabrication of flexible dye-sensitized solar cell. 相似文献
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纳米结构TiO2/聚3-己基噻吩多孔膜电极光电性能研究 总被引:6,自引:0,他引:6
用光电流作用谱、光电流-电势图等光电化学方法研究了ITO/聚3-己基噻吩(ITO/ P3HT)膜和纳米结构TiO2/聚3-己基噻吩(TiO2/P3HT)复合膜的光电转换性质. 结果表明, P3HT膜的禁带宽度为1.89 eV, 价带位置为-5.4 eV. 在ITO/TiO2/ P3HT复合膜电极中存在p-n异质结, 在一定条件下异质结的存在有利于光生电子-空穴对的分离. P3HT修饰ITO/TiO2电极可使光电流发生明显的红移, 从而提高了宽禁带半导体的光电转换效率. 相似文献
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JiangBinXIA FuYouLI ShuMingYANG ChunHuiHUANG 《中国化学快报》2004,15(5):619-622
Composite nanoporous electrode SnO2/TiO2 was fabricated for the dye sensitized solar cell (DSSC) with N3 (Cis-Ru). After introducing of TiO2, the open-circuit photovoltage (Voc) was higher than that of the pure SnO2 electrode, while short-circuit photocurrent (Isc) was varied with the ratio of the TiO2. Appropriate content of the TiO2 can be beneficial to the efficiency of the solar cell, and it gives negative impact on the composite electrode when the content of TiO2 is higher. 相似文献
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Electrochemical impedance spectra of CdSe quantume dots sensitized nanocrystalline TiO_2 solar cells
XU XueQing & XU Gang Guangzhou Institute of Energy Conversion Renewable Energy Gas Hydrate Key Laboratory of Chinese Academy of Sciences Guangzhou China 《中国科学B辑(英文版)》2011,(1)
Quantum dots sensitized nanocrystalline TiO2 solar cells (QDSSCs) are promising third-generation photovoltaic devices.In comparison with conventional dye-sensitized solar cells (DSSCs),the efficiency of QDSSCs is still very low (about 3%).In this paper,the electrochemical impedance spectroscopy technology has been adopted to investigate the quasi-Fermi level and the carrier dynamics of the colloidal CdSe QDs sensitized TiO2 eletrode with S2-/Sxredox electrolytes and the series resistance of the QDSSCs.In co... 相似文献
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Keisuke Asagoe Supachai Ngamsinlapasathian Yoshikazu Suzuki Susumu Yoshikawa 《Central European Journal of Chemistry》2007,5(2):605-619
TiO2 (B) and TiO2 anatase nanowires were prepared at 150 °C for 120 h by a hydrothermal method followed by calcination in air at 400 °C for
2 h and at 700 °C for 2 h for TiO2 (B) and TiO2 anatase, respectively. Although dye-sensitized solar cells (DSC) with fully nanowire electrodes showed a rather low light-to-electricity
conversion efficiency of 1.33 % for TiO2 (B) and 2.42% for TiO2 anatase, 10 wt % nanowire-dispersed electrodes in a P-25 TiO2-nanoparticle matrix demonstrated improved efficiency of 6.17 % for TiO2 (B) and 6.53% for TiO2 anatase, these exceeding that of pure P-25 electrodes in this work (η=5.59%). The dominant mechanisms of the improvement at 10 wt% for the two different polymorphs are thought to be different,
i.e., a light-scattering and film-thickness increment for the TiO2 (B) system, whereas there is an improved conduction path through the matrix for the TiO2 anatase system.
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HAOSan-cun FANLe-qing WUJi-huai HUANGYun-fang LINJian-ming 《高等学校化学研究》2004,20(2):205-209
A dye-sensitized nanocrystalline TiO2 solar cell(DYSC) was assembled, of which counter electrode was modified already by platinum, nickel and carbon. It was found that the DYSC had better photoelectric performance when the electrode was modified by platinum than by nickel and carbon. The influence of the incidence light wavelength on the incidence monochromatic photoelectric conversion effieieney(IPCE) was investigated.The result shows that the IPCE mainly depends on the short-circuit current density(Isc) of a DYSC, and the IPCE reaches 48.32% under the irradiation with the wavelength of 560 nm when the counter electrode of a DYSC was modified by platinum. The influence of incident light intensity on the photoelectric properties of a DYSC was also investigated. It was found that the Isc and open-circuit voltage(Voc) increased and the fill factor(ff) of the DYSC decreased with the increase of the incident light intensity. 相似文献
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热处理温度对纳晶TiO_2微结构和光催化活性的影响(英文) 总被引:2,自引:0,他引:2
以丙烯酸修饰的钛酸丁酯为前躯体,采用溶胶 凝胶法制备纳晶TiO2.用XRD,TEM,BET以及TG DTA考察了热处理温度对纳晶TiO2微结构的影响.测试结果表明,热处理温度对样品的微结构以及光催化活性有很大的影响.采用溶胶 凝胶法制备纳晶TiO2的最佳焙烧温度范围为400~600℃,低于400℃样品中的有机成分难以彻底消除且样品的结晶度不高;高于600℃,TiO2颗粒存在明显的热团聚,使晶粒尺度变大,粒径分布不均以及比表面积显著降低,这些因素都会造成样品活性降低. 相似文献
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采用模板辅助法制备了SnO2/TiO2复合空心球,样品直径为1.5~4.0μm,比表面积达到了92.9 m^2·g^-1,复合空心球表现出优越的光散射性能.以这种复合空心球作为染料敏化太阳能电池的光阳极,电池的光电转换效率可达到7.72%,高于SnO2微米球(2.70%)和TiO2微米球(6.26%).此外,以锐钛矿型TiO2纳米晶作为底层,SnO2/TiO2复合空心球作为光散射层制备的双层结构光阳极,电池光电转换效率进一步提升至8.43%. 相似文献