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用于高导电性和稳定的阴离子交换膜燃料电池中通过共价组装形成的离子通道。

Ionic Highways from Covalent Assembly in Highly Conducting and Stable Anion Exchange Membrane Fuel Cells.

作者信息

Kim Yoonseob, Wang Yanming, France-Lanord Arthur, Wang Yichong, Wu You-Chi Mason, Lin Sibo, Li Yifan, Grossman Jeffrey C, Swager Timothy M

机构信息

Department of Chemistry , Massachusetts Institute of Technology , Cambridge , Massachusetts 02139 , United States.

Department of Chemical and Biological Engineering , Hong Kong University of Science and Technology , Clear Water Bay , Kowloon , Hong Kong SAR , China.

出版信息

J Am Chem Soc. 2019 Nov 13;141(45):18152-18159. doi: 10.1021/jacs.9b08749. Epub 2019 Nov 4.

Abstract

A major challenge in the development of anion exchange membranes for fuel cells is the design and synthesis of highly stable (chemically and mechanically) conducting membranes. Membranes that can endure highly alkaline environments while rapidly transporting hydroxides are desired. Herein, we present a design using cross-linked polymer membranes containing along charge-delocalized pyrazolium cations and homoconjugated triptycenes. These ionic highway membranes show improved performance. Specifically, a conductivity of 111.6 mS cm at 80 °C was obtained with a low 7.9% water uptake and 0.91 mmol g ion exchange capacity. In contrast to existing materials, ionic highways produce higher conductivities at reduced hydration and ionic exchange capacities. The membranes retain more than 75% of their initial conductivity after 30 days of an alkaline stability test. The formation of ionic highways for ion transport is confirmed by density functional theory and Monte Carlo studies. A single cell with platinum metal catalysts at 80 °C showed a high peak density of 0.73 W cm (0.45 W cm from a silver-based cathode) and stable performance throughout 400 h tests.

摘要

开发用于燃料电池的阴离子交换膜的一个主要挑战是设计和合成高度稳定(化学和机械方面)的导电膜。需要能够在高碱性环境中耐受同时快速传输氢氧化物的膜。在此,我们提出一种设计,使用含有沿电荷离域的吡唑鎓阳离子和同共轭三棱柱的交联聚合物膜。这些离子高速公路膜表现出改进的性能。具体而言,在80°C下获得了111.6 mS cm的电导率,吸水率低至7.9%,离子交换容量为0.91 mmol g。与现有材料相比,离子高速公路在降低的水合作用和离子交换容量下产生更高的电导率。在碱性稳定性测试30天后,膜保留了其初始电导率的75%以上。密度泛函理论和蒙特卡罗研究证实了用于离子传输的离子高速公路的形成。在80°C下使用铂金属催化剂的单电池显示出0.73 W cm的高峰值功率密度(基于银的阴极的峰值功率密度为0.45 W cm),并且在400小时测试中性能稳定。

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