Binder-addition effect in TiO₂ nanoparticles on dye-sensitized solar cells evidenced by spectroscopic techniques

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• 作者：Hung-An Hsiao ; Ching-Chich Leu ; Chien-Hsin Yang ; Tzong-Liu Wang ; Yeong-Tarng Shieh
• 关键词：Anatase titanium dioxide ; Hydrothermal method ; Dye-sensitized solar cell ; Space repulsion ; Static repulsion
• 刊名：Electrochimica Acta
• 出版年：30 November, 2013
• 年：2013
• 卷：111
• 期：Complete
• 页码：784-790
• 全文大小：2251 K

文摘

This study presents a two-stage hydrothermal process to synthesize anatase TiO₂ nanoparticles. The first stage formed sodium titanate (Na₂Ti₉O₁₉). Octahedral TiO₆ in Na₂Ti₉O₁₉ shares crystal edges similar to those of octahedral TiO₆ in anatase TiO₂. This study used Na₂Ti₉O₁₉ as an intermediary to generate pure anatase TiO₂. The second stage involves disintegrating the structure of the Na₂Ti₉O₁₉ crystals through an ion exchange of Na⁺ in Na₂Ti₉O₁₉ with H⁺ in HNO₃, resulting in the formation of pure anatase TiO₂ nanoparticles (7 to 10 nm). The static (acid addition) and space repulsion (binder addition) methods (surface area with BET = 81.594 m² g^鈭?) were used to hinder the coalescence of TiO₂ nanoparticles. The proposed approach produces well-dispersed nanoparticles compared to the method using only static repulsion (surface area with BET = 68.071 m² g^鈭?). These two TiO₂ materials were used to prepare photoelectrodes with a film thickness of approximately 6 渭m in dye-sensitized solar cells (DSSCs), which achieved device efficiencies of 6.23% and 4.66%, respectively.