The electric organs of electric eels are able to convert ionic gradients into high-efficiency electricity because their electrocytes contain numerous “subnanoscale” protein ion channels that can achieve highly selective and ultrafast ion transport. Despite increasing awareness of blue energy production through nanochannel membranes, achieving high-performance energy output remains considerably unexplored. Here, we report on a heterogeneous subnanochannel membrane, consisting of a continuous UiO-66-NH₂ metal-organic framework (MOF) and a highly ordered alumina nanochannel membrane. In the positively charged membrane, the angstrom-scale windows function as ionic filters for screening anions with different hydrated sizes. Driven by osmosis, the subnanochannel membrane can produce an exceptionally high Br⁻/NO₃⁻ selectivity of ~1240, hence yielding an unprecedented power of up to 26.8 W/m² under a 100-fold KBr gradient. Achieving ultrahigh selective and ultrafast osmotic transport in ion channel–mimetic MOF-based membranes opens previously unexplored avenues toward advanced separation technologies and energy-harvesting devices.

鳗鱼的电器官能够将离子梯度转换为高效电，因为它们的细胞包含许多“亚纳米级”蛋白质离子通道，可以实现高度选择性和超快速的离子传输。尽管人们越来越意识到通过纳米通道膜产生蓝色能量的意识，但仍未开发出实现高性能能量输出的方法。在这里，我们报告异质亚通道膜，由连续的UiO-66-NH ₂金属有机框架（MOF）和高度有序的氧化铝纳米通道膜组成。在带正电的膜中，埃级窗口充当离子过滤器，用于筛选具有不同水合尺寸的阴离子。在渗透作用下，亚纳米通道膜可产生异常高的溴^- / NO ₃ ^-〜1240的选择性，因此，高产可达的前所未有的功率26.8瓦/米² 100倍KBr压梯度下。在基于离子通道的基于MOF的膜中实现超高的选择性和超快速的渗透运输，为先进的分离技术和能量收集装置打开了以前未曾探索的途径。