High-performance osmotic energy conversion (OEC) requires both high ionic selectivity and permeability in nanopores. Here, through systematical explorations of influences from individual charged nanopore surfaces on the performance of OEC, we find that the charged exterior surface on the low-concentration side (surfaceL) is essential to achieve high-performance osmotic power generation, which can significantly improve the ionic selectivity and permeability simultaneously. Detailed investigation of ionic transport indicates that electric double layers near charged surfaces provide high-speed passages for counterions. The charged surfaceL enhances cation diffusion through enlarging the effective diffusive area, and inhibits anion transport by electrostatic repulsion. Different areas of charged exterior surfaces have been considered to mimic membranes with different porosities in practical applications. Through adjusting the width of the charged ring region on the surfaceL, electric power in single nanopores increases from 0.3 to 3.4 pW with a plateau at the width of ~200 nm. The power density increases from 4200 to 4900 W/m2 and then decreases monotonously that reaches the commercial benchmark at the charged width of ~480 nm. While, energy conversion efficiency can be promoted from 4% to 26%. Our results provide useful guide in the design of nanoporous membranes for high-performance osmotic energy harvesting.
Electron-electrolyte coupling in AC transport through nanofluidic channels
Laboratoire de Physique de l’École Normale Supérieure, ENS, Université PSL, CNRS, Sorbonne Université, Université Paris Cité（巴黎高等师范学院物理实验室，ENS，巴黎文理研究大学，法国国家科学研究中心，索邦大学，巴黎西岱大学）；Institute of Science and Technology Austria (ISTA)（奥地利科学与技术研究所）；Fritz Haber Institute of the Max Planck Society（马克斯·普朗克学会弗里茨·哈伯研究所）；The Quantum Plumbing Lab, École Polytechnique Fédérale de Lausanne (EPFL)（洛桑联邦理工学院量子管道实验室）
Dynamics of charge fluctuations in nanocapacitors: effects of salt concentration and electrode metallicity from Brownian dynamics
Sorbonne Université（索邦大学）；CNRS（法国国家科学研究中心）；Laboratoire PHENIX (Physicochimie des Electrolytes et Nanosystèmes Interfaciaux)（PHENIX实验室（界面电解质与纳米系统物理化学））；Réseau sur le Stockage Electrochimique de l’Energie (RS2E)（电化学储能网络）
Modulation of Electroosmotic Flow through Short Nanopores by Charged Exterior Surfaces
School of Mechanical and Electronic Engineering, Shandong Jianzhu University（山东建筑大学机电工程学院）；Key Laboratory of High Efficiency and Clean Mechanical Manufacture of the Ministry of Education, State Key Laboratory of Advanced Equipment and Technology for Metal Forming, School of Mechanical Engineering, Shandong University（山东大学机械工程学院高效洁净制造教育部重点实验室、金属成形先进装备与技术国家重点实验室）；Shenzhen Research Institute of Shandong University（山东大学深圳研究院）
Modulation of Ionic Current Rectification in Short Unipolar Nanopores
Shandong University（山东大学）；Shenzhen Research Institute of Shandong University（山东大学深圳研究院）；Tianjin University（天津大学）；University of California, Irvine（加州大学尔湾分校）
Ionic transport through sub-10 nm diameter hydrophobic high-aspect ratio nanopores: experiment, theory and simulation
在纳米尺度上离子传输的基本理解是必不可少的开发基于纳米孔技术和新一代高性能纳滤膜分离和纯化应用的生物传感器。我们在这里研究了离子通过具有高纵横比（长度L=6 μm，直径范围从1到10 nm）和具有良好控制的圆柱形几何形状的单个纯中性疏水纳米孔的传输。我们开发了一个详细的混合介观理论方法的纳米孔内的电解质电导率，明确考虑离子平流电渗流和可能的流动滑移在孔表面。通过拟合实验电导数据，我们表明，对于纳米孔直径大于4 nm的恒定弱表面电荷密度约10 $^{-2}$ C m $^{-2}$需要纳入模型中，以考虑在低盐浓度的几个皮西门子的电导平台。对于更紧密的纳米孔，我们的分析导致更高的表面电荷密度，这可以归因于靠近孔表面的离子溶剂化结构的改变，正如我们进行的分子动力学模拟中观察到的那样。
