磺化共价有机框架改性壳聚糖质子交换膜的制备及其性能研究
Synthesis of sulfonated covalent organic framework modified chitosan electrolyte for efficient proton exchange
李建全 1李瑶 1王乐天 1王朝2
作者信息
- 1. 武汉理工大学 材料复合新技术国家重点实验室,湖北 武汉 430070
- 2. 武汉理工大学 材料复合新技术国家重点实验室,湖北 武汉 430070;武汉理工大学 湖北省燃料电池重点实验室,湖北 武汉 430070
- 折叠
摘要
开发低成本、高性能的质子交换膜电解质对能源转化与存储领域的发展至关重要.将磺化共价有机框架(TPBD-SO3H)引入到壳聚糖(CS)基体中,制备了一系列CS/TPBD-SO3H复合膜,并对其结构与性能进行了表征.结果表明:TPBD-SO3H与CS之间能够产生交联作用,提高了复合膜的热稳定性和机械性能,其中拉伸强度达到了最高的80.2 MPa,与CS 膜相比提高了 201%;交联作用降低了复合膜的溶胀率,与 CS 膜相比下降了约 40%.TPBD-SO3H的孔道结构以及丰富的磺酸基团起到优化质子传输路径的作用,使复合膜的质子电导率在80℃,95%RH条件下,最高达到了24.7 mS/cm,为CS膜的2 倍.
Abstract
Exploration on the proton exchange electrolytes with cost-effective and high-performance is crit-ical to the development of energy conversion and storage field.The sulfonated covalent organic framework(TPBD-SO3H)was introduced into the chitosan(CS)matrix to fabricate a series of CS/TPBD-SO3H composite membranes,followed by analysis of their structures and properties.The results indicate that a cross-linking interaction between TPBD-SO3H and CS offers an enhanced thermal stability and optimized mechanical properties of the composite membranes.The tensile strength reached a maximum value of 80.2 MPa,exhibiting a 201%of improvement compared to the CS membrane.Simultaneously,the cross-linking interaction also brings a reduction in the swelling rate of the composite membranes,with a de-crease of approximately～40%compared to the CS membrane.More importantly,the porous structure of TPBD-SO3H,along with its abundant sulfonic acid groups,plays a crucial role in the efficient proton transportation.The composite membrane exhibiting a proton conductivity of up to 24.7 mS/cm under con-ditions of 80℃and 95%RH,which is twice that of the CS membrane.
关键词
质子交换膜/共价有机框架/壳聚糖/磺化Key words
proton exchange membrane/covalent organic framework/chitosan/sulfonation引用本文复制引用
基金项目
国家自然科学基金青年基金(21902122)
湖北省自然科学基金(20221j0082)
出版年
2024
NETL
NSTL
万方数据