Development of highly stable anion exchange membranes for high performance alkaline fuel cells

合成了含氨基取代荧基的阴离子导电芳香族多嵌段共聚物，季节化多嵌段共聚物可制得韧性好、可弯曲、透明的膜。扫描电子显微镜观察证实，良好控制的多嵌段结构导致了疏水/亲水相分离和相互连接的离子传输途径。离聚体膜在水中表现出较高的氢氧化物离子电导率。在严重的加速老化条件下，对膜的耐久性进行了评估，发现有轻微的降解。用QPE膜在80℃下进行了无贵金属直接联氨燃料电池的实验，获得了最大功率密度。

Anion conductive aromatic multiblock copolymers containing ammonium-substituted fluorene groups, were synthesized The quaternized multiblock copolymers produced ductile, bendable, and transparent membranes. A well-controlled multiblock structure was responsible for the developed hydrophobic/hydrophilic phase separation and interconnected ion transporting pathway, as confirmed by scanning transmission electron microscopic observation. The ionomer membranes showed high hydroxide ion conductivities in water. The durabilities of the membranes were evaluated under severe, accelerated-aging conditions, and minor degradation was recognized. A noble metal-free direct hydrazine fuel cell was operated with the QPE membrane at 80 degree C. High maximum power density was achieved.