引用本文:
张莉, 杨迈之, 乔学斌, 郝彦忠, 高恩勤, 蔡生民, 孟凡顺, 田禾. 双染料复合敏化SnO2纳米多孔膜光电极的研究[J]. 应用化学,
1999, 16(4): 1-5.
Citation: Zhang Li, Yang Maizhi, Qiao Xuebin, Hao Yanzhong, Gao Enqin, Cai Shengmin, Meng Fanshun, Tian He. Dye Cosensitization of Nanoporous SnO2 Photoelectrode[J]. Chinese Journal of Applied Chemistry, 1999, 16(4): 1-5.
Citation: Zhang Li, Yang Maizhi, Qiao Xuebin, Hao Yanzhong, Gao Enqin, Cai Shengmin, Meng Fanshun, Tian He. Dye Cosensitization of Nanoporous SnO2 Photoelectrode[J]. Chinese Journal of Applied Chemistry, 1999, 16(4): 1-5.
双染料复合敏化SnO2纳米多孔膜光电极的研究
摘要:
研究了五甲川菁和联吡啶钌双染料复合敏化SnO2纳米结构电极的光电化学行为.结果表明,五甲川菁在550~700 nm范围有强吸收带,而联吡啶钌在400~600 nm吸光性好,它们在电极表面的共吸附使吸光范围几乎覆盖整个可见和近红外光区.它们的激发态能级为-0.91V(vs.NHE)和-0.6V(vs.NHE),都高于SnO2纳米粒子的导带位置,有利于它们的激发态电子注入SnO2纳米粒子的导带,即各自吸收不同波长范围的光,共同产生阳极光电流.因而这种双染料复合敏化比单一五甲川菁染料或联吡啶钌敏化效果有更显著的提高,同时光电转化率得到明显改善,最高单色光量子转换效率(IPCE)可达68%.
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关键词:
- 双染料复合敏化
- / SnO2纳米结构多孔膜电极
- / 光电化学
- / 光电转换
English
Dye Cosensitization of Nanoporous SnO2 Photoelectrode
Abstract:
The photoelectrochemical behavior of the nanostructure SnO2 porous film cosensitized by a cyanine dye (PMC) and cis-di(thiocyanato)bis(2,2'-bipyridyl-4,4'-dicarboxylate)ruthenium(Ⅱ) dye (RuL2(SCN)2) have been investigated. The ground state level and the excited state level of the dyes were determined by cyclic voltammetry and optical absorption spectroscopy. The results showed that the excited state levels of both dyes matched the conduction band edge of SnO2 nanoparticle. The optical absorption band of PMC situates in the region of 550 to 700 nm and that of RuL2(SCN)2 in the region of 400 to 600 nm. Therefore the cosensitization of these two dyes can widen the optical absorption region. As a result, the photocurrent intensity of nanostructure SnO2 electrode was increased obviously by co-sensitization in both visible and near infra-red regions. Consequently the light-to-electricity conversion efficiency was improved evidently. The maximum value of IPCE has reached 68%.
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