To further mitigate the phosphoric acid leakage in high temperature proton exchange membrane (PEM), the microporosity of Tröger's base (TB) membrane based on a V-shaped bridged bicyclic diamine has been fine-tailored readily by polymeric blending with a miscible polymer of intrinsic microporosity (PIM-1). As expected, the average cavity radius in the range of 3.46–4.21 Å has been achieved when the blending ratio of PIM-1 increases from 5 to 20 mol% due to the interaction between the amine group of TB and the nitrile group of PIM-1. The resulting PEMs show excellent PA retention ability. Notably, PIM/TB9 membrane with a suitable cavity radius of 3.5 Å and largest FFV₄ of 49.1% exhibits an exciting PA retention of about 80%, which is much better than the pristine TB membrane. Thus, the remaining proton conductivity of PIM/TB9 is almost 5 times higher than that of TB membrane after 22 relative humidity cycle tests. Moreover, the resulting cell can run smoothly within a wide temperature range from 0 to 160 °C. The single cell performs for over 150 AST cycles and remains stable for >600 h with no visible voltage decay at 80 °C. Therefore, these results indicate the technical feasibility to improve the PA retention via fine-tuning the intrinsic microporosity of the PEMs through a direct blending method.

为了进一步减轻高温质子交换膜 (PEM) 中的磷酸泄漏，基于 V 形桥连双环二胺的 Tröger 基 (TB) 膜的微孔率已经通过与本征可混溶聚合物的聚合物共混而轻松地进行了精细调整微孔隙率 (PIM-1)。正如预期的那样，当 PIM-1 的混合比例从 5 mol% 增加到 20 mol% 时，由于 TB 的胺基和 PIM- 1. 所得 PEM 显示出出色的 PA 保留能力。值得注意的是，PIM/TB9 膜具有 3.5 Å 的合适腔半径和最大 FFV ₄49.1% 的 PA 保留率约为 80%，这比原始 TB 膜好得多。因此，经过 22 次相对湿度循环测试后，PIM/TB9 的剩余质子电导率几乎是 TB 膜的 5 倍。此外，所得电池可在 0 至 160 °C 的宽温度范围内平稳运行。单电池可执行 150 多个 AST 循环，并在 80 °C 下保持稳定 >600 小时，没有可见的电压衰减。因此，这些结果表明通过直接混合方法微调 PEM 的固有微孔率来提高 PA 保留的技术可行性。