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苯基磷酸联吡啶钌络合物敏化纳晶多孔TiO_2薄膜电极光电性能研究 总被引:8,自引:0,他引:8
苯基磷酸联吡啶钌络合物敏化纳晶多孔TiO2薄膜电极光电性能研究*杨蓉王维波敬炳文肖绪瑞**张曼华沈涛(中国科学院感光化学研究所,北京100101)关键词联吡啶钌,TiO2薄膜,染料敏化用有机光敏染料敏化半导体,通过染料分子的吸附功能基团与半导体相互作... 相似文献
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采用水热法合成了Zn2+离子掺杂的TiO2纳米粒子(掺杂量0.5%),并用光电化学方法研究了Ru(bpy)2(NCS)2(bpy=2,2'-bipydine-4,4'-dicarboxylicacid)分别敏化Zn2+掺杂的TiO2电极和PbS/Zn2+-TiO2复合半导体纳米多孔膜电极的光电化学行为.实验证明Ru(bpy)2(NCS)2敏化PbS/Zn2+-TiO2复合半导体纳米多孔膜电极比单独敏化Zn2+-TiO2电极的光电效果好,且敏化电极的光电流产生的起始波长都比Zn2+-TiO2电极向长波方向移动;在360600nm范围内,Ru(bpy)2(NCS)2敏化PbS/Zn2+-TiO2复合半导体纳米多孔膜电极比单独敏化Zn2+掺杂TiO2电极的效果更好. 相似文献
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选用大小粒径分别为200nm和21nm的TiO2颗粒,采用刮涂法制备了几种不同条件的TiO2薄膜电极,研究了大小颗粒TiO2的复合方式和质量比对其所组装染料敏化太阳能电池光电性能的影响。应用红外吸收光谱仪和扫描电子显微镜对TiO2薄膜电极进行了表征,在100mW/cm2(AM 1.5G)光照下,测试了电池的光电性能。结果表明:将大颗粒TiO2作为光散射层,且大颗粒TiO2和小颗粒TiO2质量比为1∶3时,所制薄膜不但可以保持纳米粉体高比表面积的优点,同时可以提高对太阳光的散射率,用其组装的电池光电性能最好,转换效率达到2.46%。 相似文献
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染料敏化太阳能电池(DSSCs)为无机固态光伏电池提供了可靠的可代替概念。染料敏化太阳能电池的光电转换效率主要依赖于纳米晶多孔半导体TiO2薄膜电极的染料。由于天然染料的低成本和工艺制备简单的优点,天然染料作为敏化剂已成为DSSC研究热点。作为DSSC的敏化剂的天然染料,如花青素类、胡萝卜素类、叶绿素类、类黄酮,可从不同植物不同部分提取出。主要介绍和讨论天然敏化剂的发展和实用化必须解决的关键问题。 相似文献
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将纳米TiO2颗粒以电泳沉积法披覆于导电玻璃上,同时整合光电极、反电极、电解质及染料制备出染料敏化太阳能电池.首先将TiO2纳米颗粒与异丙醇所混合的电泳悬浮液通过电泳技术沉积出适当厚度的多层膜结构;精确控制制程中的电流、电压与沉积时间而获得单层厚度为3.3μm的TiO2薄膜.此多层膜通过低温烧结增加其致密性及染料披覆效果.最后将此多层薄膜作为工作电极,封装成染料敏化太阳能电池,经由I-V曲线检测结果显示,所制染料敏化太阳能电池的光电转换效率为5.29%,且这种染料敏化太阳能电池的制造成本十分低廉. 相似文献
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采用水热合成法制备出TiO2纳米管,通过XRD、TEM和氮气等温吸附-脱附仪等测试手段对TiO2纳米管进行了表征.用烧结的TiO2纳米管和P25粉末混合制成薄膜电极,并研究了薄膜电极的表面形貌、染料吸附量和光电性能.研究表明,加入TiO2纳米管可以制备出机械稳定的薄膜;掺杂TiO2纳米管的含量越多,薄膜电极的染料吸附量越大;掺杂5%烧结纳米管粉末的薄膜电极的光电性能最好,其短路电流可达3.25mA,光电转换效率达到1.67%. 相似文献
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Takashiro Akitsu Barbara Miroslaw Shanmugavel Sudarsan 《International journal of molecular sciences》2022,23(17)
Composite materials very often provide new catalytic, optical or other physicochemical properties not observed for each component separately. Photofunctions in hybrid systems are an interesting topic of great importance for industry. This review presents the recent advances, trends and possible applications of photofunctions of hybrid systems composed of Schiff base metal complexes and metal or semiconductor (nano)materials. We focus on photocatalysis, sensitization in solar cells (DSSC—dye sensitized solar cell), ligand-induced chirality and applications in environmental protection for Cr(VI) to Cr(III) reduction, in cosmetology as sunscreens, in real-time visualization of cellular processes, in bio-labeling, and in light activated prodrug applications. 相似文献
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二氧化钛光催化分解水制氢技术进展 总被引:1,自引:0,他引:1
简单介绍了二氧化钛光催化分解水制氢的基本原理。综述了加入牺牲剂、碳酸钠、贵金属负载化、金属离子掺杂、阴离子掺杂、染料光敏化、半导体复合以及离子注入等提高二氧化钛光催化制氢的方法,讨论了这几种改性技术的机理以及对提高二氧化钛在可见光下的制氢效率的作用。重点讨论了阴离子掺杂和离子注入技术的机理和研究进展,指出离子注入是目前扩展二氧化钛光响应的最为有效的技术。最后讨论了光催化分解水制氢的氢氧分离问题,并通过与其他制氢技术的对比分析,指出光催化制氢将是通往氢经济的非常有潜力的制氢技术。 相似文献
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The inclusion of the metal free semiconductor graphitic carbon nitride (g-CN) into polymer systems brings a variety of new options, for instance as a heterogeneous photoredox polymer initiator. In this context, we present here the decoration of the inner surface of poly(styrene-co-divinylbenzene) beads with organomodified g-CN via one pot suspension photopolymerization. The resulting beads are varied by changing reaction parameters, such as, crosslinking ratio, presence of porogens, and mechanical agitation. The photocatalytic activity of so-formed beads was tested by aqueous rhodamine B dye photodegradation experiments. Additionally, dye adsorption/desorption properties were examined in aqueous as well as in organic solvents. Photoinduced surface modification with vinylsulfonic acid and 4-vinyl pyridine is introduced. Overall, metal-free semiconductor g-CN donates photoactivity to polymer networks that can be employed for dye photodegradation and acid–base catalyst transformation through facile photoinduced surface modifications. 相似文献
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Charge transfer on the photoelectrode of dye sensitized solar cell (DSC) is composed of the various processes as follows: photoexcitation of electron in the dye; electron injection from the excited dye into the conduction band of oxide semiconductor; electron diffusion in the oxide semiconductor, reaction between oxidized dye and iodide ions (I−); and charge recombination. The charge recombination is one of the main factors that limit the efficiency of photoelectric conversion at photoelectrode. It is well known that 4-tert-butyl pyridine (TBP) is the useful additive in order to suppress the charge recombination. The authors fabricated the DSC with two photoelectrode materials such as titanium dioxide (TiO2) and zinc oxide (ZnO), and analyzed the charge recombination by using electrochemical impedance spectroscopy. Theoretical equation of Faradaic impedance was derived from the reaction model of photoelectorde, and the charge transfer resistance of the photoelectrode was defined from the Faradaic impedance. In addition, the influence of the charge recombination on the impedance spectrum of the photoelectrode was discussed by the comparison between simulated and experimental results. 相似文献
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纳米TiO_2光催化剂的改性进展 总被引:1,自引:0,他引:1
较低的光量子效率是限制TiO2光催化技术实用化的主要原因,对其改性是提高TiO2光量子效率的重要手段。介绍了采用掺杂过渡金属、表面光敏化、表面螯合及衍生、贵金属沉积、复合半导体和添加电子捕获剂等方法对TiO2光催化剂进行改性,并对这些方面研究所取得的进展进行了简单的评述。 相似文献