| 1 | Designing artificial ion channels with strict K^(+)/Na^(+)selectivity toward next-generation electric-eel-mimetic ionic power generation显示文摘A biological potassium channel is>1000 times more permeable to K^(+)than to Na^(+)and exhibits a giant permeation rate of~10^(8)ions/s.It is a great challenge to construct artificial potassium channels with such high sele ctivity and ion conduction rate.Herein,we unveil a long-overlo oked structural feature that underpins the ultra-high K^(+)/Na^(+)selectivity.By carrying out massive molecular dynamics simulation for ion transport through carbonyl-oxygen-modified bi-layer graphene nanopores,we find that the twisted carbonyl rings enable strict potassium selectivity with a dynamic K^(+)/Na^(+)selectivity ratio of 1295 and a K^(+)conduction rate of 3.5×10^(7)ions/s,approaching those of the biological counterparts.Intriguingly,atomic trajectories of K^(+)permeation events suggest a dual-ion transport mode,i.e.two like-charged potassium ions are successively captured by the nanopores in the graphene bi-layer and are interconnected by sharing one or two interlayer water molecules.The dual-ion behavior allows rapid release of the exiting potassium ion via a soft knock-on mechanism,which has previously been found only in biological ion channels.As a proof-of-concept utilization of this discovery,we propose a novel way for ionic power generation by mixing KCl and NaCl solutions through the bi-layer graphene nanopores,termed potassium-permselectivity enabled osmotic power generation(PoPee-OP G).Theoretically,the biomimetic device achieves a very high power density of>1000 W/m^(2)with graphene sheets of<1%porosity.This study provides a blueprint for artificial potassium channels and thus paves the way toward next-generation electric-eel-mimetic ionic power generation. | Jipeng Li Linhan Du Xian Kong Jianzhong Wu Diannan Lu Lei Jiang Wei Guo | 2023 | National Science Review2023，10，12： | 0 |
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