A hybrid membrane of sulfonated poly(ether ether ketone)/polydopamine-coated carbon nanotubes loaded phosphotungstic acid (S/DCNTs-HPW) is proposed for vanadium redox flow battery (VRFB). With the DCNTs-HPW nanofillers as the proton donor and acceptor, a high proton conductivity and low vanadium ions permeability of the S/DCNTs-HPW hybrid membranes is demonstrated owing to the formed acid-base interaction. Specifically, S/DCNTs-HPW-1 gives higher ion selectivity (25.4 × 10³ S min cm⁻³) than that of pristine SPEEK (4.3 × 10³ S min cm⁻³) and Nafion 117 (4.0 × 10³ S min cm⁻³). Cell utilizing S/DCNTs-HPW-1 reveals excellent coulombic efficiency (98.2–99.4%) and energy efficiency (89.5–69.0%) under the current density of 50–160 mA cm⁻², and a 34.5% charge capacity retention under 100 cycles is achieved based on the excellent membrane structure and chemical stability. The S/DCNTs-HPW-1 membrane shows a self-discharge time of 576 h, which is longer than that of the Nafion 117 membrane (23 h). Thus, the S/DCNTs-HPW hybrid membranes are suggested for potential use as alternative PEMs in the VRFB system.

提出了一种载有磷钨酸的磺化聚醚醚酮/聚多巴胺涂层碳纳米管混合膜（S / DCNTs-HPW），用于钒还原液流电池（VRFB）。用DCNTs-HPW纳米填料作为质子供体和受体，由于形成的酸碱相互作用，证明了S / DCNTs-HPW杂化膜的高质子传导性和低钒离子渗透性。具体而言，S / DCNTs-HPW-1与原始SPEEK（4.3×10 ³  S min cm ^-3）和Nafion 117（4.0×10 ³  S min ）相比，具有更高的离子选择性（25.4×10 ³  S min cm ^-3）。厘米^-3）。利用S / DCNTs-HPW-1的电池在50–160 mA cm ^-2的电流密度下显示出出色的库仑效率（98.2–99.4％）和能量效率（89.5–69.0％），以及在100以下电流下保留34.5％的电荷容量基于优异的膜结构和化学稳定性，可实现循环。S / DCNTs-HPW-1膜的自放电时间为576 h，比Nafion 117膜的自放电时间（23 h）长。因此，建议将S / DCNTs-HPW混合膜作为VRFB系统中的替代PEM的潜在用途。