文献类型：期刊文献

英文题名：Non-Negligible Roles of Pore Size Distribution on Electroosmotic Flow in Nanoporous Materials

作者：Lian, Cheng[1,2];Su, Haiping[1,2];Li, Chunzhong[3];Liu, Honglai[1,2];Wu, Jianzhong[4]

机构：[1]East China Univ Sci & Technol, Shanghai Engn Res Ctr Hierarch Nanomat, State Key Lab Chem Engn, Shanghai 200237, Peoples R China;[2]East China Univ Sci & Technol, Sch Chem & Mol Engn, Shanghai 200237, Peoples R China;[3]East China Univ Sci & Technol, Sch Chem Engn, Shanghai Engn Res Ctr Hierarch Nanomat, Minist Educ,Key Lab Ultrafine Mat, Shanghai 200237, Peoples R China;[4]Univ Calif Riverside, Dept Chem & Environm Engn, Riverside, CA 92521 USA

年份：2019

卷号：13

期号：7

起止页码：8185

外文期刊名：ACS NANO

收录：;EI(收录号：20193707423306);WOS:【SCI-EXPANDED(收录号:WOS:000477786400082)】；

基金：This work was sponsored by the National Natural Science Foundation of China (91834301, 21808055), State Administration of Foreign Experts Affairs of China (B08021), China Postdoctoral Science Foundation (2019M651416), and Shanghai Sailing Program (18YF1405400, 19YF1411700). J.W. thanks the financial support from the Fluid Interface Reactions, Structures and Transport (FIRST) Center, an Energy Frontier Research Center funded by the U.S. Department of Energy, Office of Basic Energy Sciences. We also thank Professor Marc-Olivier Coppens for the helpful discussion.

语种：英文

外文关键词：ion transport; nanoporous electrodes; network connectivity; pore size distribution; molecular modeling

摘要：Electroosmotic flow in nanoporous materials is of fundamental importance for the design and development of filtration membranes and electrochemical devices such as supercapacitors and batteries. Recent experiments suggest that ion transport in a porous network is substantially different from that in individual nanochannels due to the pore size distribution and pore connectivity. Herein, we report a theoretical framework for ion transport in nanoporous materials by combing the classical density functional theory to describe the electrical double layer (EDL) structure, the Navier Stokes equation for the fluid flow, and the effective medium approximation to bridge the gap between individual nanopores and the network connectivity. We find that ion conductivity in nanoporous materials is extremely sensitive to the pore size distribution when the average size of micropores is comparable to the EDL thickness. The theoretical predictions provide an explanation of the giant gap between the conductivity of a single pore and that of a porous network and highlight the mechanism of ion transport through nanoporous materials important for numerous practical applications.