Diffusion in the electrolyte and charge-transfer reaction at the platinum electrode in dye-sensitized solar cells
Diffusion in the electrolyte and charge-transfer reaction at the platinum electrode in dye-sensitized solar cells
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DOI：
10.1016/s0013-4686(01)00540-0
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发表时间：
2001-08-01
影响因子：
6.6
通讯作者：
Georg, A
中科院分区：
文献类型：
--
作者：
Hauch, A;Georg, A
电化学阻抗谱作为一种合适的技术来表征电解质/铂界面的染料敏化太阳能电池（DSC）。的电解质/铂界面的电荷转移电阻进行了检查不同的溶剂，阳离子，镀铂的透明导电氧化物和铂层的厚度的方法。一个结果是2nm的Pt对于使用乙腈作为溶剂的DSC是足够的。已发现催化剂中毒的影响。通过测量扩散极限电流密度，评估了不同溶剂下IT在电解质中的扩散常数。测量了不同偏压下的扩散过电位。在高电位下，发现电解液中有三碘离子生成，通过测量电解液中碘离子和三碘离子浓度与电荷转移电阻的关系，研究了铂/电解液界面电荷转移反应的机理。速率决定步骤被认为是电子从I-转移到Pt电极。(C)2001爱思唯尔科技有限公司版权所有。
Electrochemical impedance spectroscopy was applied as a suitable technique to characterize the electrolyte/platinum interface of a dye-sensitized solar cell (DSC). The charge-transfer resistance of the electrolyte/platinum interface was examined for different solvents, cations, methods of platinizing the transparent conducting oxide and thicknesses of the platinum layer. One result is that 2 nm of Pt is sufficient for a DSC with acetonitrile as the solvent. Effects of poisoning the catalyst have been discovered. The diffusion constant of IT in the electrolyte was evaluated for different solvents by measuring the diffusion-limited current density. The diffusion overpotential was measured for different bias potentials. At high potentials, a triiodide production in the electrolyte was found. The mechanism of the charge-transfer reaction at the platinum/electrolyte interface was investigated by measuring the dependence of the charge-transfer resistance on the concentrations of iodide and triiodide ions in the electrolyte. The rate-determining step was found to be the electron transfer from I- to the Pt electrode. (C) 2001 Elsevier Science Ltd. All rights reserved.