The sluggish migration of proton from anode to cathode poses a significant challenge in osmotic microbial fuel cell (OsMFC), leading to a pH imbalance that impairs overall performance. Forward osmosis (FO) membrane provides a possibility to solve this issue by designing proton-conducting channels. Herein, we proposed a novel idea of synergistic acceleration of proton migration by constructing hydrophilic nanochannels and assembling acid-base pairs in FO membrane. It was realized by incorporating heterogenic functionalized metal-organic frameworks (MOFs) into a polyamide layer to fabricate thin film nanocomposite (TFN) FO membrane. The formation of acid-base pairs (S-O···H-N) between NH₂-MIL-101(Cr) and SO₃H-MIL-101(Cr) significantly reduced proton migration energy barrier as revealed by density functional theory analysis. As a result, the synergistic effect of hydrophilic nanochannels and acid-base pairs created by the heterogenic MOFs significantly boosted proton transport. The OsMFC employing the as-prepared membrane (FO-3) achieved a peak power density of 9.80 ± 0.52 W·m^-3. Additionally, the volume of pure water extracted was approximately 1.45 times greater than that of the control, and the average chemical oxygen demand (COD) removal efficiency increased by 10.64 %. This innovative protocol of fabricating highly proton-conducting MOFs-TFN FO membranes creates a unique perspective for effectively regulating pH imbalance in OsMFC for large-scale applications.

中文翻译：

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渗透微生物燃料电池中质子迁移的协同加速：正渗透膜中功能化金属有机框架产生的亲水性纳米通道耦合酸碱对

质子从阳极到阴极的缓慢迁移对渗透微生物燃料电池 （OsMFC） 构成了重大挑战，导致 pH 值失衡，从而损害整体性能。正渗透 （FO） 膜提供了一种通过设计质子传导通道来解决这个问题的可能性。在此，我们提出了一种通过在 FO 膜中构建亲水纳米通道和组装酸碱对来协同加速质子迁移的新想法。它是通过将异基因功能化金属有机框架 （MOF） 掺入聚酰胺层以制造薄膜纳米复合材料 （TFN） FO 膜来实现的。酸碱对 （S-O···密度泛函理论分析揭示了 NH 2-MIL-101（Cr） 和 SO₃H-MIL-101（Cr） 之间的 H-N） 显著降低了质子迁移能垒。结果，异质 MOF 产生的亲水性纳米通道和酸碱对的协同作用显着促进了质子转运。采用制备的膜 （FO-3） 的 OsMFC 实现了 9.80 ± 0.52 W·^m-3 的峰值功率密度。此外，提取的纯水体积约为对照的 1.45 倍，平均化学需氧量 （COD） 去除效率提高了 10.64 %。这种制造高质子导电 MOFs-TFN FO 膜的创新方案为大规模应用中有效调节 OsMFC 中的 pH 失衡创造了独特的视角。