Sparse multi-nanopore osmotic power generators
Sparse multi-nanopore osmotic power generators
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DOI：
10.1016/j.xcrp.2022.101065
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发表时间：
2022-10-19
影响因子：
8.9
通讯作者：
Kawai, Tomoji
中科院分区：
文献类型：
--
作者：
Tsutsui, Makusu;Yokota, Kazumichi;Kawai, Tomoji
超薄纳米孔膜是一种新兴的能量收集系统，能够从盐度梯度发电。在这里，我们报告其实际可行性的评估，通过探索的能量转换效率的单个密集的多孔在薄氮化硅。当孔径缩小到20 nm时，单孔的离子电流特性显示出准完美的阳离子选择性。渗透选择性纳米孔显示在1,000倍跨膜盐浓度差下产生160 pW的渗透功率。同时，尽管通过将多个孔平行整合获得了更大的能量，但是过多的孔隙率也导致了能量转换效率的降低，从而证明了对于具有1 μ m的网格间距的100 nm尺寸的多纳米孔，每平方米100 W的最佳功率密度。本研究结果为设计高效的纳米孔膜渗透发电机提供了指导。
Ultrathin nanopore membrane is an emerging energy harvesting system capable of generating electricity from salinity gradients. Here, we report on the evaluation of its practical feasibility by exploring the energy conversion efficiency of single to densely packed multi-pores in a thin silicon nitride. The ionic current characteristics of single pores reveal a quasi-perfect cation selectivity when shrinking the diameter to 20 nm. The perm-selective nanopore is shown to yield osmotic power of 160 pW under a 1,000-fold transmembrane salt concentration difference. Meanwhile, whereas larger energy is gained by parallelly integrating multiple pores, excessive porosity also led to degraded energy conversion efficiency, thereby demonstrating an optimal power density of 100 W per square meter for 100 nm-sized multi-nanopores with a grid spacing of 1 mu m. The present findings offer a guide to design highly efficient nanopore membrane osmotic power generators.