Harnessing Solar-Salinity Synergy with Porphyrin-Based Ionic Covalent-Organic-Framework Membranes for Enhanced Ionic Power Generation

Weipeng Xian, Changjia Zhu, Zhuozhi Lai, Qing Guo, Di Wu, Qing-Wei Meng, Sai Wang, Shengqian Ma and Qi Sun*, 
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Abstract

Nature seamlessly integrates multiple functions for energy conversion, utilizing solar energy and salinity gradients as the primary drivers for ionic power generation. The creation of artificial membranes capable of finely controlling ion diffusion within nanoscale channels, driven by diverse forces, remains a challenging endeavor. In this study, we present an innovative approach: an ionic covalent-organic framework (COF) membrane constructed using chromophoric porphyrin units. The incorporation of ionic groups within these nanoconfined channels imparts the membrane with exceptional charge screening capabilities. Moreover, the membrane exhibits photoelectric responsivity, enhancing the ion conductivity upon exposure to light. As a result, this leads to a substantial increase in the output power density. In practical terms, when subjected to a salinity gradient of 0.5/0.01 M NaCl and exposed to light, the device achieved an outstanding peak power density of 18.0 ± 0.9 W m–2, surpassing the commercial benchmark by 3.6-fold. This innovative membrane design not only represents a significant leap forward in materials science but also opens promising avenues for advancing sustainable energy technologies.

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利用基于卟啉的离子共价-有机框架膜的太阳能-盐水协同作用来提高离子发电量
大自然无缝整合了多种能量转换功能,利用太阳能和盐度梯度作为离子发电的主要驱动力。在各种力量的驱动下,制造能够精细控制纳米级通道内离子扩散的人工膜仍然是一项具有挑战性的工作。在本研究中,我们提出了一种创新方法:利用发色卟啉单元构建离子共价有机框架(COF)膜。在这些纳米限定通道中加入离子基团,使膜具有卓越的电荷筛选能力。此外,这种膜还具有光电响应性,在光线照射下可增强离子传导性。因此,输出功率密度大大提高。在实际应用中,在 0.5/0.01 M NaCl 的盐度梯度和光照条件下,该装置的峰值功率密度达到了 18.0 ± 0.9 W m-2,比商业基准高出 3.6 倍。这种创新的膜设计不仅代表了材料科学的重大飞跃,也为推动可持续能源技术的发展开辟了前景广阔的道路。
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