Due to the good balance between the low vanadium permeability and high proton conductivity, AIEM (amphoteric ion exchange membrane) has attracted vast consideration for all vanadium redox flow battery (VRB) application. Similar to the AIEM, BPMs (bipolar membranes) also have both anion and cation exchange groups in the anion-selective layer and cation-selective layer. In this paper, a series of BPMs based on PTFE (polytetrafluoroethylene) reinforced QAPSF (quaternized polysulfone) and SPEEK (sulfonated poly ether ether ketone) are prepared and investigated for the VRB application. As expected, all the membranes have presented typical sandwiched structure with an obvious intermediate layer observed by SEM. Owing to the “Donnan exclusion effect” of anion groups in QAPSF, all the BPMs have shown very low VO²⁺ permeability. Particularly, the battery with Q/P/S-3:2 membrane has shown average coulombic efficiency of 98.9% at current density of 40–80 mA cm⁻². Considering the simple adjustment and abundant choice of cation or anion resins, BPMs membranes should be a promising candidate for VRB application after further investigation.

由于低钒渗透性和高质子传导性之间的良好平衡，AIEM（两性离子交换膜）已在所有钒氧化还原液流电池（VRB）应用中引起了广泛的关注。与AIEM相似，BPM（双极膜）在阴离子选择层和阳离子选择层中同时具有阴离子和阳离子交换基团。本文制备了一系列基于PTFE（聚四氟乙烯）增强的QAPSF（季铵化聚砜）和SPEEK（磺化聚醚醚酮）的BPM，并研究了其在VRB中的应用。不出所料，所有膜都呈现出典型的夹心结构，并通过SEM观察到明显的中间层。由于QAPSF中阴离子基团的“唐南排斥效应”，所有BPM都显示出非常低的VO ²⁺渗透性。特别是，具有Q / P / S-3：2膜的电池在40-80 mA cm ^-2的电流密度下显示出98.9％的平均库仑效率。考虑到阳离子或阴离子树脂的简单调整和丰富的选择，经过进一步研究后，BPMs膜应成为VRB应用的有前途的候选者。