Molecular sieve as an effective barrier for methanol crossover in direct methanol fuel cells
Molecular sieve as an effective barrier for methanol crossover in direct methanol fuel cells
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DOI：
10.1016/j.ijhydene.2020.01.133
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发表时间：
2020-03
影响因子：
7.2
通讯作者：
Xuejing Sun;Congrong Yang;Zhangxun Xia;Fulai Qi;Hai Sun;Gongquan Sun
中科院分区：
文献类型：
--
作者：
Xuejing Sun;Congrong Yang;Zhangxun Xia;Fulai Qi;Hai Sun;Gongquan Sun
甲醇交叉仍然是广泛使用的Nafion®膜直接甲醇燃料电池商业化的一个重大障碍。本文将分子筛引入到聚合物电解质膜的设计中，以减轻甲醇交叉。UZM-9分子筛的中间窗口尺寸为0.42 nm，可有效分离水合甲醇（约1.10 nm）和水合质子（约0.23 nm）。经UZM-9改性后，甲醇通过膜的扩散速率被有效抑制，比原Nafion®膜低约四倍。在2 mol L−1甲醇溶液条件下，其峰值功率密度达到80 mW cm−2，是采用Nafion®膜的直接甲醇燃料电池的2.5倍。这些结果为减轻直接甲醇燃料电池中的甲醇交叉开辟了一条有希望的途径。
Methanol crossover is still a significant barrier to the commercialization of direct methanol fuel cells with wide-used Nafion® membrane. Herein, molecular sieve is introduced into the design of polymer electrolyte membrane to alleviate methanol crossover. The UZM-9 zeolite with an intermediate window size of 0.42 nm can effectively separate hydrated methanol (ca. 1.10 nm) and hydrated proton (ca. 0.23 nm). The methanol diffusion rate through the membrane is effectively suppressed after modified with UZM-9, which is about four times lower than the origin Nafion® membrane. The resulted peak power density reached 80 mW cm−2with 2 mol L−1methanol solution feed, which is 2.5-fold higher than that of direct methanol fuel cell with commercial Nafion® membrane. These results open a promising route to alleviate methanol crossover in direct methanol fuel cells.