Quantifying internal charge transfer and mixed ion-electron transfer in conjugated radical polymers,Chemical Science

当前位置： X-MOL 学术 › Chem. Sci. › 论文详情

Our official English website, www.x-mol.net, welcomes your feedback! (Note: you will need to create a separate account there.)

Quantifying internal charge transfer and mixed ion-electron transfer in conjugated radical polymers
Chemical Science ( IF 7.6 ) Pub Date : 2020-08-31 , DOI: 10.1039/d0sc03567j
Shaoyang Wang ₁ , Alexandra D Easley ₂ , Ratul M Thakur ₁ , Ting Ma ₁ , Junyeong Yun ₁ , Yiren Zhang ₃ , Christopher K Ober ₃ , Jodie L Lutkenhaus _{1,

2}

Affiliation

Macromolecular radicals are receiving growing interest as functional materials in energy storage devices and in electronics. With the need for enhanced conductivity, researchers have turned to macromolecular radicals bearing conjugated backbones, but results thus far have yielded conjugated radical polymers that are inferior in comparison to their non-conjugated partners. The emerging explanation is that the radical unit and the conjugated backbone (both being redox active) transfer electrons between each other, essentially “quenching” conductivity or capacity. Here, the internal charge transfer process is quantified using a polythiophene loaded with 0, 25, or 100% nitroxide radicals (2,2,6,6-tetramethyl-1-piperidinyloxy [TEMPO]). Importantly, deconvolution of the cyclic voltammograms shows mixed faradaic and non-faradaic contributions that contribute to the internal charge transfer process. Further, mixed ion-electron transfer is determined for the 100% TEMPO-loaded conjugated radical polymer, from which it is estimated that one triflate anion and one propylene carbone molecule are exchanged for every electron. Although these findings indicate the reason behind their poor conductivity and capacity, they point to how these materials might be used as voltage regulators in the future.

中文翻译：

量化共轭自由基聚合物中的内部电荷转移和混合离子电子转移

大分子自由基作为能量存储设备和电子产品中的功能材料越来越受到人们的关注。由于需要增强导电性，研究人员已转向带有共轭主链的大分子自由基，但迄今为止的结果已经产生了与非共轭聚合物相比较差的共轭自由基聚合物。新出现的解释是，自由基单元和共轭主链（两者都具有氧化还原活性）在彼此之间转移电子，本质上是“猝灭”电导率或容量。此处，使用负载有 0%、25% 或 100% 硝基氧自由基（2,2,6,6-四甲基-1-哌啶氧基 [TEMPO]）的聚噻吩对内部电荷转移过程进行量化。重要的是，循环伏安图的反卷积显示了法拉第和非法拉第的混合贡献，这些贡献有助于内部电荷转移过程。此外，测定了100%负载TEMPO的共轭自由基聚合物的混合离子-电子转移，由此估计每个电子交换一个三氟甲磺酸根阴离子和一个丙烯碳分子。尽管这些发现表明了它们导电性和容量较差的原因，但它们指出了这些材料将来如何用作电压调节器。

更新日期：2020-09-23

点击分享查看原文

点击收藏

公开下载

阅读更多本刊最新论文本刊介绍/投稿指南11