Water-Soluble Polyelectrolyte-Grafted Multiwalled Carbon Nanotube Thin Films for Efficient Counter Electrode of Dye-Sensitized Solar Cells
Water-Soluble Polyelectrolyte-Grafted Multiwalled Carbon Nanotube Thin Films for Efficient Counter Electrode of Dye-Sensitized Solar Cells
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DOI：
10.1021/nn100574g
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发表时间：
2010-06-01
期刊：
影响因子：
17.1
通讯作者：
Jang, Sung-Yeon
中科院分区：
文献类型：
--
作者：
Han, Jinkyu;Kim, Hyunju;Jang, Sung-Yeon
水溶性，聚电解质接枝多壁碳纳米管（MWCNTs），MWCNT-g-PSSNa，使用“接枝”路线合成。采用静电喷涂技术制备了MWCNT-g-PSSNa薄膜，并将其作为染料敏化太阳能电池的对电极。电子喷雾的MWCNT-g-PSSNa薄膜基CE（MWCNT-CE）在大面积上是均匀的，并且剥离良好的MWCNT形成高度互连的网络结构。考察了不同厚度MWCNT-CE的电催化活性。MWCNT-g-PSSNa薄膜在DSSC中显示出作为CE的高效率。使用MWCNT-g-PSSNa薄膜基CE（DSSC-MWCNT）的DSSC的功率转换效率（PCE）在CE膜厚度近似于0.3 μ m时>6%。当膜厚约为1 μ m时，最佳PCE>7%，比传统的碳基CE薄20-50倍。MWCNTCE/电解质界面的电荷转移电阻在MWCNT-CE厚度为0.31 μ m时为1.52 Ω cm（2），低于Pt-CE/电解质界面的1.78 Ω cm（2）。这突出了DSSC的低成本CE制造的潜力，使用一种简单的沉积技术，在低温下从一个环境“友好”的解决方案。
Water-soluble, polyelectrolyte-grafted multiwalled carbon nanotubes (MWCNTs), MWCNT-g-PSSNa, were synthesized using a "grafting to" route. MWCNT-g-PSSNa thin films fabricated by an electrostatic spray (e-spray) technique were used as the counter electrode (CE) for dye-sensitized solar cells (DSSCs). The e-sprayed MWCNT-g-PSSNa thin-film-based CEs (MWCNT-CE) were uniform over a large area, and the well-exfoliated MWCNTs formed highly interconnected network structures. The electrochemical catalytic activity of the MWCNT-CE at different thicknesses was investigated. The MWCNT-g-PSSNa thin film showed high efficiency as a CE in DSSCs. The power conversion efficiency (PCE) of the DSSCs using the MWCNT-g-PSSNa thin-film-based CE (DSSC-MWCNT) was >6% at a CE film thickness of similar to 0.3 mu m. The optimum PCE was >7% at a film thickness of similar to 1 mu m which is 20-50 times thinner than conventional carbon-based CE. The charge transfer resistance at the MWCNTCE/electrolyte interface was 1.52 Omega cm(2) at a MWCNT-CE thickness of 0.31 mu m, which is lower than that of a Pt-CE/electrolyte interface, 1.78 Omega cm(2). This highlights the potential for the low-cost CE fabrication of DSSCs using a facile deposition technique from an environmentally "friendly" solution at low temperatures.