Anion exchange membrane with high conductivity and mechanical stability for fuel cell applications
Anion exchange membrane fuel cells (AEMFCs) are advantageous over proton exchange membrane fuel cells in terms of electrode reaction kinetics and electrocatalyst versatility. As one of the key materials for this type of fuel cell, AEM transports anions from cathode to anode during cell operation and governs the performance of AEMFC. In this work, we report on the fabrication of two novel types of AEMs and their performances in alkaline fuel cells. One is PTFE based composite anion exchange membrane prepared via in situ thermal polymerization of chloromethyl monomer in pre-treated PTFE matrix followed by quaternary amination and alkalization. Attributed to a high chloromethyl monomer uptake and a morphology featuring hydrophobic matrix confined hydrophilic domain, this membrane showed hydroxide conductivity up to 0.049 S cm_1 at room temperature and a maximum direct hydrazine hydrate fuel cell power density of 110mWcm_2 at a voltage of 0.7 V. The second type of AEM we fabricated is imidazolium functionalized polysulfone membrane, which exhibited ion exchange capacity, conductivity and thermal stability that are comparable or superior to those of conventional membranes. Its alkaline stability appears to relate with the structure of backbone, and the optimized membrane can be stable for up to 1000 h when used in direct borohydride fuel cell.
anion exchange membrane fuel cell PTFE imidazolium conductivity stability
Fengxiang Zhang Huamin Zhang Chao Qu
Center for energy storage batteries and technologies, Dalian Institute of Chemical Physics, Chinese Academy of Sciences, Dalian China 457 Zhongshan Road, Dalian, 116023
国际会议
大连
英文
86
2012-05-28（万方平台首次上网日期，不代表论文的发表时间）