膜
氢氧化物
流动电池
化学工程
电化学
电导率
材料科学
电池(电)
离子电导率
储能
离子
无机化学
化学
电极
有机化学
电解质
功率(物理)
物理化学
工程类
物理
量子力学
生物化学
作者
Jing Hu,Pengfei Wang,Jianbo Hu,Menglian Zheng,Mingdong Dong
标识
DOI:10.1002/advs.202401404
摘要
Abstract The development of membranes with rapid and selective ionic transport is imperative for diverse electrochemical energy conversion and storage systems, including fuel cells and flow batteries. However, the practical application of membranes is significantly hindered by their limited conductivity and stability under strong alkaline conditions. Herein, a unique composite membrane decorated with functional Cu 2+ cross‐linked chitosan (Cts‐Cu‐M) is reported and their high hydroxide ion conductivity and stability in alkaline flow batteries are demonstrated. The underlying hydroxide ions transport of the membrane through Cu 2+ coordinated nano‐confined channels with abundant hydrogen bonding network via Grotthuss (proton hopping) mechanism is proposed. Consequently, the Cts‐Cu‐M membrane achieves high hydroxide ion conductivity with an area resistance of 0.17 Ω cm 2 and enables an alkaline zinc‐based flow battery to operate at 320 mA cm −2 , along with an energy efficiency of ≈80%. Furthermore, the membrane enables the battery for 200 cycles of long‐cycle stability at a current density of 200 mA cm −2 . This study offers an in‐depth understanding of ion transport for the design and preparation of high‐performance membranes for energy storage devices and beyond.
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