For the porous-membrane-based osmotic energy generator, the potential synergistic enhancement mechanism of various key parameters is still controversial, especially because optimizing the trade-off between permeability and selectivity is still a challenge. Here, to construct a permeability and selectivity synergistically enhanced osmotic energy generator, the two-dimensional porous membranes with tunable charge density are prepared by inserting sulfonated polyether sulfone into graphene oxide. Influences of charge density and pore size on the ion transport are explored, and the ionic behaviors in the channel are calculated by numerical simulations. The mechanism of ion transport in the process is studied in depth, and the fundamental principles of energy conversion are revealed. The results demonstrate that charge density and pore size should be matched to construct the optimal ion channel. This collaborative enhancement strategy of permeability and selectivity has significantly improved the output power in osmotic energy generation; compared to the pure graphene oxide membrane, the composite membrane presents almost 20 times improvement.

中文翻译：

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用于渗透能量收集的渗透性和选择性协同增强的纳米流体膜

对于基于多孔膜的渗透能发生器，各种关键参数的潜在协同增强机制仍然存在争议，特别是因为优化渗透性和选择性之间的权衡仍然是一个挑战。这里，为了构建渗透性和选择性协同增强的渗透能发生器，通过将磺化聚醚砜插入氧化石墨烯中制备了具有可调电荷密度的二维多孔膜。探讨了电荷密度和孔径对离子传输的影响，并通过数值模拟计算了通道中的离子行为。深入研究了该过程中离子输运的机理，揭示了能量转换的基本原理。结果表明，电荷密度和孔径应匹配才能构建最佳离子通道。这种渗透性和选择性的协同增强策略显着提高了渗透能产生的输出功率；与纯氧化石墨烯膜相比，复合膜的性能提高了近20倍。