纤维素
膜
纳米纤维
质子
氢铵
化学
分子
氨基酸
质子交换膜燃料电池
热稳定性
质子输运
电导率
高分子化学
离子交换
化学工程
有机化学
材料科学
物理化学
生物化学
离子
纳米技术
物理
工程类
量子力学
作者
Guodong Zhao,Xin Xu,Youbo Di,Hang Wang,Bowen Cheng,Lei Shi,Yan Zhu,Yan Yin
标识
DOI:10.1016/j.jpowsour.2019.227035
摘要
Inspired by the structure of amino acid residues chain in transmembrane proteins, amino acid molecules are immobilized onto cellulose nanofibers to form clusters as quasi-one dimensional proton-conducting pathways for nanofiber hybrid proton exchange membranes. The structure of conducting clusters and properties of the hybrid proton exchange membranes are examined. The results show that the amino acid clusters enhance the proton conductivity, and the proton exchange membrane with Ser-clusters shows the highest proton conductivity of 0.264 S/cm at 80 °C under 100% humidity and temperature. Diffusion coefficients and mean square displacements of hydronium ion are then calculated using Density-Functional Tight-Binding method to better understand the proton-conducting mechanism of amino acid clusters, and the results of molecular dynamics simulation are in good agreement with the experiments. Besides, the structure of three-dimensional hydrophilic network of nanofibers exhibits significant effect on the performance of water uptake, dimensional stability, methanol permeability and thermal stability of the hybrid proton exchange membranes. Fuel cell performance test confirms that these membranes are suitable for direct methanol fuel cells.
科研通智能强力驱动
Strongly Powered by AbleSci AI