Ye Jiaye, Wu Chun, Qin Wei, Zhong Fangfang, Ding Mei
College of Materials Science and Engineering, Changsha University of Science and Technology, Changsha 410114, China.
J Nanosci Nanotechnol. 2020 Aug 1;20(8):4714-4721. doi: 10.1166/jnn.2020.18503.
The purpose of this study was to improve the repulsion ability of sulfonated poly(ether ether ketone) (SPEEK) membrane for the vanadium ions crossover. For this purpose graphene oxide (GO) nanosheet and titanium dioxide (TiO₂) nanoparticles were employed into the polymer matrix to prepare SPEEK/GO/TiO₂ hybrid membrane via solution-casting method for vanadium redox flow battery (VRFB). The morphology, permeability of vanadium ions and device performance of asprepared membrane were investigated and discussed. It was observed that with the barrier block effect by the filler, the VRFB single cell with the optimized SPEEK/GO/TiO₂ hybrid membrane exhibited high coulombic efficiency (99%), excellent energy efficiency (85%) and vigorous cyclability (~97.2% capacity retention after 100 cycles). Moreover, the VRFB cell with this blend membrane showed lower vanadium ions permeability than Nafion 212 or pure SPEEK membranes. These results demonstrated that the comprehensive properties of hybrid membrane have been remarkably improved comparing to pristine SPEEK which suggested that the hybrid membrane was applicable for VRFB energy storage system.
本研究的目的是提高磺化聚醚醚酮（SPEEK）膜对钒离子渗透的排斥能力。为此，将氧化石墨烯（GO）纳米片和二氧化钛（TiO₂）纳米颗粒引入聚合物基体中，通过溶液浇铸法制备用于钒氧化还原液流电池（VRFB）的SPEEK/GO/TiO₂复合膜。对所制备膜的形态、钒离子渗透性和器件性能进行了研究和讨论。观察到，由于填料的阻挡效应，具有优化的SPEEK/GO/TiO₂复合膜的VRFB单电池表现出高库仑效率（约99%）、优异的能量效率（约85%）和良好的循环稳定性（100次循环后容量保持率约97.2%）。此外，具有这种共混膜的VRFB电池显示出比Nafion 212或纯SPEEK膜更低的钒离子渗透性。这些结果表明，与原始SPEEK相比，复合膜的综合性能得到了显著改善，这表明该复合膜适用于VRFB储能系统。
