Designing artificial ion channels with strict K+/Na+ selectivity toward next-generation electric-eel-mimetic ionic power generation
作者机构：State Key Laboratory of Marine Resource Utilization in South China Sea School of Materials Science and Engineering Hainan University Department of Chemical EngineeringTsinghua University South China Advanced Institute for Soft Matter Science and TechnologyGuangdong Provincial Key Laboratory of Functional and Intelligent Hybrid Materials and Devices School of Emergent Soft MatterSouth China University of Technology Department of Chemical and Environmental EngineeringUniversity of California Research Institute for Frontier ScienceBeihang University Center for Quantum Physics and Intelligent SciencesDepartment of Physics Capital Normal University
出 版 物：《National Science Review》 (国家科学评论(英文版))
年 卷 期：2023年第10卷第12期
页 面：193-202页
核心收录：
学科分类：08[工学] 09[农学] 0901[农学-作物学] 0836[工学-生物工程] 090102[农学-作物遗传育种]
基 金：supported by the National Natural Science Foundation of China (21975268) the Recruitment Program of Guangdong (2016ZT06C322) the TCL Science and Technology Innovation Fund Hainan University’s Scientific Research Foundation (KYQD(ZR)-22120)
主 题：artificial ion channel bi-layer graphene dehydrated ion transport bio-inspired materials energy conversion
摘 要：A biological potassium channel is 1000 times more permeable to K+than to Na+and exhibits a giant permeation rate of ～108ions/*** is a great challenge to construct artificial potassium channels with such high sele ctivity and ion conduction ***,we unveil a long-overlo oked structural feature that underpins the ultra-high K+/Na+*** 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 × 107ions/s,approaching those of the biological ***,atomic trajectories of K+permeation events suggest a dual-ion transport mode,*** 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 *** 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 *** 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/m2with graphene sheets of 1% *** study provides a blueprint for artificial potassium channels and thus paves the way toward next-generation electric-eel-mimetic ionic power generation.
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