Charge transfer in photorechargeable composite films of TiO2 and polyaniline
Charge transfer in photorechargeable composite films of TiO2 and polyaniline
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DOI：
10.7567/jjap.54.071101
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发表时间：
2015-06
影响因子：
1.5
通讯作者：
T. Nomiyama;K. Sasabe;Kenta Sakamoto;Yuji Horie
中科院分区：
文献类型：
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作者：
T. Nomiyama;K. Sasabe;Kenta Sakamoto;Yuji Horie
光充电电池（PRB）是一种在单个电池中具有储能功能的光伏器件。 PRB 的光活性电极是由裸露的多孔 TiO2 和 TiO2-聚苯胺 (PANi) 混合物组成的双层薄膜，分别用作光伏电流发生器和离子去掺杂的电化学能量存储。为了研究 TiO2 和 PANi 之间的电荷转移，通过改变 TiO2-PANi 混合物的厚度 LS 来测量光充电量子效率 QE（[放电时的电子计数]/[光充电时的入射光子计数]）。紫外光子的量子效率 QEuv 在 LS ∼ 7 µm 处的最大值为 ∼7%。电荷转移的时间常数τTP约为10−1 s，比TiO2内激发电子的寿命长十倍或更多。这些事实表明，光充电过程中的主要速率限制因素是TiO2和PANi之间的电荷转移。
A photorechargeable battery (PRB) is a photovoltaic device having an energy storage function in a single cell. The photoactive electrode of PRB is a bilayer film consisting of bare porous TiO2 and a TiO2–polyaniline (PANi) mixture that work as a photovoltaic current generator and an electrochemical energy storage by ion dedoping, respectively. To study the charge transfer between TiO2 and PANi, the photorechargeable quantum efficiency QE ([electron count on discharge]/[incident photon count on photocharge]) was measured by varying the thickness LS of the TiO2–PANi mixture. The quantum efficiency QEuv for UV photons had a maximum of ∼7% at LS ∼ 7 µm. The time constant τTP for the charge transfer was about 10−1 s, which was longer ten times or more than the lifetime of excited electrons within TiO2. These facts reveal that the main rate-limiting factor in the photocharging process is the charge transfer between TiO2 and PANi.