Lou Xuechun, Ye Jiaye, Xia Lu, Chang Shunli, Zhao Xiaoli, Wu Chun, Ding Mei
College of Materials Science and Engineering, Changsha University of Science and Technology, Changsha 410114, China.
State Key Laboratory of Mechanical Transmission, School of Materials Science and Engineering, Chongqing University, Chongqing 400044, China.
J Nanosci Nanotechnol. 2019 Apr 1;19(4):2247-2252. doi: 10.1166/jnn.2019.16467.
In this work, a sulfonated poly(ether ether ketone)/titanium oxide composite membrane (SPEEK/TiO₂) was prepared by solution casting method. The TiO₂ nanoparticles in the polymer matrix not only improved the vanadium ion selectivity of SPEEK/TiO₂, but also enhanced the mechanical stability of this membrane by forming hydrogen bonds with SPEEK. Based on the SPEEK/TiO₂ composite membrane, vanadium redox flow battery (VRB) exhibited ultrahigh coulombic efficiency (over 99.3%) and excellent energy efficiency (over 84.8%) under current density of 120 mA cm2 for 200 cycles. More importantly, the device also presented excellent discharge capacity retention performance of about 95.4% and 86.9% after 100 and 200 cycles under this current density, respectively. The good performance and low cost of this membrane indicate that it is a promising candidate in VRB applications and an excellent substitute for Nafion membranes.
在本工作中，通过溶液浇铸法制备了磺化聚醚醚酮/二氧化钛复合膜（SPEEK/TiO₂）。聚合物基体中的TiO₂纳米颗粒不仅提高了SPEEK/TiO₂对钒离子的选择性，还通过与SPEEK形成氢键增强了该膜的机械稳定性。基于SPEEK/TiO₂复合膜，钒氧化还原液流电池（VRB）在120 mA cm²的电流密度下循环200次时表现出超高的库仑效率（超过99.3%）和优异的能量效率（超过84.8%）。更重要的是，在该电流密度下，该装置在100次和200次循环后分别呈现出约95.4%和86.9%的优异放电容量保持性能。这种膜的良好性能和低成本表明它是VRB应用中有前景的候选材料，也是Nafion膜的优良替代品。
