Conjugated Microporous Polymers with Dense Sulfonic Acid Groups as Efficient Proton Conductors
Conjugated Microporous Polymers with Dense Sulfonic Acid Groups as Efficient Proton Conductors
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具有稠密磺酸基团的共轭微孔聚合物作为高效质子导体
DOI：
10.1021/acs.langmuir.8b00926
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发表时间：
2018
期刊：
影响因子：
3.9
通讯作者：
Han Bao-Hang
中科院分区：
文献类型：
--
作者：
Yang Si-Jie;Ding Xuesong;Han Bao-Hang
质子交换膜燃料电池作为一种新型的绿色可持续能源，近年来受到了广泛的关注。多孔有机聚合物具有高比表面积、可调孔径、优异的热稳定性和化学稳定性以及可引入特定功能基团等特点，近年来在燃料电池电解质领域显示出了令人瞩目的发展前景。本文通过Suzuki-Miyaura偶联反应合成了具有丰富π结构和永久孔隙率的BO-CMP-1和BO-CMP-2，并对其热稳定性和化学稳定性进行了研究。由于它们的刚性结构和丰富的亲电取代位置，这两种新型的多孔聚合物通过后磺化共价修饰有密集的磺酸基团，如SBO-CMP-1和SBO-CMP-2所示。系统地研究了SBO-CMP的质子导电性，以评价其作为质子导电材料的性能。发现它们的性能高度依赖于湿度和温度，并且它们显示出相对高的质子传导性。SBO-CMP-1和SBO-CMP-2在70 °C和100%相对湿度下的质子电导率分别为1.29 × 10- 2和5.21 × 10-3S cm-1。SBO-CMP-1的0.32 eV和SBO-CMP-2的0.40 eV的低活化能值表明质子传导的Grotthuss机制。
Proton-exchange membrane fuel cells, emerging as green and sustainable energy sources, have attracted extensive attention in recent decades. Porous organic polymers, which feature in high surface area values, tunable pore sizes, excellent thermal and chemical stabilities, and the flexibility to incorporate specific functional groups, have recently displayed their striking images as potential electrolytes for fuel cells. In this work, BO-CMP-1 and BO-CMP-2 that possess rich π-structure and permanent porosity and have high thermal and chemical stability were synthesized through Suzuki–Miyaura coupling reaction. Owing to their rigid structures and abundant electrophilic substitution positions, these two novel porous polymers were covalently decorated with dense sulfonic acid groups by postsulfonation, as denoted by SBO-CMP-1 and SBO-CMP-2. The proton conductivity of SBO-CMPs is systematically studied to evaluate their performance as proton-conductive materials. It was found that their performance is highly humidity- and temperature-dependent and they show relatively high proton conductivity. For SBO-CMP-1 and SBO-CMP-2, their proton conductivities are 1.29 × 10–2and 5.21 × 10–3S cm–1, respectively, at 70 °C and 100% relative humidity. Low activation energy values of 0.32 eV for SBO-CMP-1 and 0.40 eV for SBO-CMP-2 suggest the Grotthuss mechanism for proton conduction.