膜
聚合物
化学工程
材料科学
超分子聚合物
超分子化学
电池(电)
流量(数学)
分离(统计)
化学
纳米技术
色谱法
高分子化学
分子
有机化学
计算机科学
复合材料
工程类
几何学
数学
生物化学
量子力学
机器学习
物理
功率(物理)
作者
Zutao Sheng,Sisi Xiao,Guang Zeng,Qing He,Zhaoyong Chen,Junfei Duan,Sangshan Peng
标识
DOI:10.1016/j.memsci.2024.123280
摘要
Pseudo-nanophase separation, enabled by noncovalently grafted sidechains, offers a promising approach for constructing high-performance membranes, featuring rapid ion transport, robust chemical stability, and simplified manufacturing. However, striking a balance between ionic conductivity and mechanical/chemical stability proves challenging since excessive hydrophilic grafting leads to overswelling and compromised integrity of the membranes, rendering them unsuitable for demanding applications like vanadium redox flow batteries (VRFBs). In this study, we describe a new approach for achieving high-performance VRFB membranes via employing polymer as supramolecular sidechains, rather than small molecules. This strategy achieves remarkable pseudo-nanophase separation while minimizing the utilization of functional (hydrophilic) sites. As a result, the resulting membranes exhibit exceptional robustness and proton conductivity, with an extraordinarily low area resistance of merely 0.11 Ω cm2, thus circumventing the prevailing trade-off between ionic conductivity and mechanical/chemical stability. Ultimately, VRFBs integrated with these membranes achieve energy efficiencies up to 80% even at high current densities of 240 mA cm-2, accompanied by a remarkably low capacity decay rate of 0.064% per cycle during long-cycle tests. This work not only achieves ultra-high conductivity with minimal functional groups, but also advances pseudo-nanophase separation strategies and provides valuable insights into optimized utilization of limited functional groups in membrane design.
科研通智能强力驱动
Strongly Powered by AbleSci AI