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Effect of Imidazole-based Additives on the Voltage of Dye Sensitized Solar Cells with Cu(II/I) Redox Mediators
Electrochimica Acta ( IF 5.5 ) Pub Date : 2025-01-27 , DOI: 10.1016/j.electacta.2025.145758
Ladislav Kavan, Michael Graetzel

Acetonitrile solutions of Cu(tmby)22+ exhibit aging-dependent changes of UV-Vis spectra, which were attributed to partial reduction to Cu(tmby)2+. This effect is boosted by the addition of imidazole bases, i.e., N-methyl-benzimidazole (NMB) or 5-chloro-1-ethyl-2-methyl-imidazole (CEMI). These bases have only small effect on the diffusion coefficients of Cu(tmby)22+, but downshift the redox potential of Cu(tmby)22+/+ by ca. 0.1-0.2 V. The addition of CEMI to the electrolyte solution decreases the flatband potential of the TiO2 anatase (101) face. The corresponding position of conduction band minimum is upshifted by 0.19 or 0.26 eV, depending on the counterion type, Li+ or Na+, respectively. The formal redox potentials of Cu(tmby)22+/+ in the CEMI-modified electrolyte solution, interrelated with the respective flatband potentials in TiO2, provide a refined estimate of the maximum accessible open-circuit photovoltage of DSSC.

中文翻译:


咪唑类助剂对含 Cu(II/I) 氧化还原介质的染料敏化太阳能电池电压的影响



Cu(tmby) 2 2+ 的乙腈溶液表现出紫外-可见光谱的老化依赖性变化,这归因于 Cu(tmby) 2 + 的部分还原。通过添加咪唑碱,即 N-甲基苯并咪唑 (NMB) 或 5-氯-1-乙基-2-甲基-咪唑 (CEMI) 来增强这种效果。这些碱对 Cu(tmby) 2 2+ 的扩散系数影响很小,但会使 Cu(tmby) 2 2+/+ 的氧化还原电位降低约 0.1-0.2 V。向电解质溶液中添加 CEMI 会降低 TiO 2 锐钛矿 (101) 表面的平带电位。导带最小值的相应位置分别上移 0.19 或 0.26 eV,具体取决于反离子类型 Li + 或 Na + 。CEMI 改性电解质溶液中 Cu(tmby) 2 2+/+ 的正式氧化还原电位与 TiO 2 中的相应平带电位相互关联,提供了 DSSC 最大可接近开路光电压的精确估计。
更新日期:2025-01-28
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