基于TEMPO的高分支聚合物作为用于氧化还原流电池应用的催化剂.
Koosha Ehtiati1,2, Ilya Anufriev1,3, Christian Friebe4
1Laboratory of Organic and Macromolecular Chemistry (IOMC), Friedrich Schiller University Jena Humboldtstrasse 10 Jena 07743 Germany ulrich.schubert@uni-jena.de.
RSC advances
|October 21, 2024
概括
超分支聚合物降低了氧化还原流电池电解质粘度,并改善了电荷转移. 然而,副作用和TEMPO禁用限制了性能,需要进一步研究实际应用.
科学领域:
- 材料科学 材料科学 材料科学
- 电化学 电化学 电化学
- 聚合物化学 聚合物化学
背景情况:
- 氧化还原活性聚合物 (RAP) 通过使用尺寸排除膜来降低氧化还原流电池 (RFB) 的潜在成本.
- 在RAP中,高电解质粘度和缓慢的扩散/电子转移率阻碍了它们与小分子相比的性能.
- RAP结构和水力动力学特性之间的关系仍未得到充分探索.
研究的目的:
- 为了合成和研究高分支的2,2,6,6-四甲基基氧化 (TEMPO) 基聚合物作为RFBs的低粘度阴解质.
- 阐明聚合物结构和分子质量分布对水力动力学性质的影响.
- 评估这些RAP在RFB应用中的潜力.
主要方法:
- 通过阶段增长聚合 (aza-Michael 添加) 和聚合后修改合成基于 TEMPO 的聚合物.
- 聚合物结构和分子质量分布的表征使用尺寸排除色谱 (SEC) 与粘度检测.
- 粘度测量和交叉检查,以确定最佳的摩尔质量和水力动力学特性.
- 在RFB配置中进行电化学测试.
主要成果:
- 成功合成了基于TEMPO的高分支聚合物,具有紧的结构和降低粘度 (约. 在1M TEMPO单位时21 mPas).
- 与线性对应物相比,超分支聚合物的扩散速度更快,电荷转移率更高.
- 观察到的RFB性能差,归因于氧化TEMPO部分的副作用和TEMPO单元的部分停用.
结论:
- 超分支聚合物架构有效地降低了粘度,并增强了RFB基于TEMPO的RAP的移动性.
- 仍然存在挑战,包括透析 (交叉) 期间的物质损失,TEMPO停用以及在电池条件下的副作用.
- 需要进一步的研究来应对这些挑战,以便实际实施这些有前途的RAP.
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