纳米团簇
Nafion公司
多金属氧酸盐
膜
超分子化学
钒
离子键合
选择性
材料科学
质子输运
化学
化学工程
无机化学
高分子化学
纳米技术
有机化学
离子
电化学
电极
分子
催化作用
物理化学
生物化学
工程类
作者
Haibo He,Shihao Song,Liang Zhai,Zexu Li,Sihan Wang,Peng Zuo,Zhu You-liang,Haolong Li
标识
DOI:10.1002/anie.202409006
摘要
Proton exchange membranes with high selectivity are urgently required in energy and electronic technologies. Nafion, a state‐of‐the‐art commercial proton exchange membrane material, faces significant challenges. It suffers from the permeation of undesirable substances, like hydrogen in fuel cells and vanadium ions in redox flow batteries, due to the unmatched sizes between its ionic domains (3~5 nm) and these substances. In this work, we present a supramolecular modification strategy that simultaneously enhances the proton conductivity and selectivity of Nafion. We employ fluoroalkyl‐grafted polyoxometalate (POMs) nanoclusters as supramolecular additives to modify Nafion via co‐assembly. These POMs can precisely and robustly decorate at Nafion ionic domains, with their fluoroalkyl chains anchoring into the perfluorinated matrix while their inorganic clusters stay in the ionic regions. The hybrid membranes, with continuous proton hopping sites and nanoscale steric hindrance offered by POMs, exhibit a 56% increase in proton conductivity and a 100% improvement in proton/vanadium selectivity. This leads to significantly enhanced power density and energy efficiency in fuel cells and vanadium flow batteries, respectively. These results underscore the intriguing potential of molecular cluster additives in improving the functions of ion‐conducting membranes.
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