A novel long-side-chain sulfonated poly(2,6-dimethyl-1,4-phenylene oxide) membrane for vanadium redox flow battery

作者：Yan, Xiaoming; Sun, Jiahui; Gao, Li; Zheng, Wenji; Dai, Yan; Ruan, Xuehua; He, Gaohong^*

来源：International Journal of Hydrogen Energy, 2018, 43(1): 301-310.

DOI：10.1016/j.ijhydene.2017.10.143

• Cation exchange membrane
• PPO
• Long side chain
• Vanadium redox flow battery
• Microphase separation

A novel long-side-chain sulfonated poly(2,6-dimethyl-1,4-phenylene oxide) (S-L-PPO) membrane was successfully prepared for VRFB applications. The long side chains were introduced onto the PPO backbones by a simple and controllable acylation with 4-fluorobenzoyl chloride and a subsequent condensation with sodium 4-hydroxybenzenesulfonate. The introduction of long side chains drives the formation of a good hydrophilic/hydrophobic micro-phase separation structure, which is evidenced by AFM. The S-L-PPO membrane with a degree of sulfonation (DS) of 51% showed an ultralow vanadium permeability (4.3 x 10(-9) cm(2) s(-1)) and a decent proton conductivity (44 mS cm(-1)). As a result, the energy efficiency of VRFB with S-LPPO-51% membrane was up to 81.8% that was higher than that with Nafion 212 (78.0%) at a current density of 120 mA cm(-2). In addition, the self-discharge duration of the cell with S-LPPO-51% membrane was 222 h that was nine times longer than that of Nafion 212 (23 h). All these indicate that the membrane prepared here is promising for the application in VRFB.

• 出版日期2018-1-4
• 单位大连理工大学; 精细化工国家重点实验室