Enhanced osmotic energy conversion in staircase nanochannels: Effects of shape and surface charge

IF 8.3 1区工程技术 Q1 ENGINEERING, CHEMICAL

Desalination Pub Date : 2025-01-29 DOI:10.1016/j.desal.2025.118615

Changzheng Li , Mengzhen Liao , Zhenquan Li , Tao Rui , Fuyuan He , Jingying Dai

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Abstract

Reverse electrodialysis is an effective method for the scalable extraction of osmotic energy from salinity gradient directly. Previous studies have demonstrated that the irregular surface and hierarchical design of nanochannels are conducive to ion transport. Herein, the staircase nanochannel was proposed to enhance the osmotic energy conversion, and the impact of shape and surface charge on the power generation performance was investigated in numerical simulation. Among various staircase nanochannels, the tetralayer nanochannel exhibits optimal power generation performance, achieving an output power 239 % higher than the cylindrical nanochannel. When the concentration ratio is 500 with ions diffusing from the bottom to the top, the nanochannel featuring two electropositive narrow pores and two electronegative large pores generates a power output of 1.16 pw, 23.76 % higher than the electronegative tetralayer nanochannel. Furthermore, reducing the size of the top pore can significantly improve the power generation performance of the nanochannel. When the concentration ratio is 1000 and the top pore radius is 5 nm, the maximum power output reaches 1.26 pw. This work revealed the ion transport characteristics of staircase nanochannels, providing a theoretical foundation for designing and optimizing nanostructures to capture osmotic energy in the future.

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来源期刊

Desalination 工程技术-工程：化工

CiteScore

14.60

自引率

20.20%

发文量

619

审稿时长

41 days

期刊介绍： Desalination is a scholarly journal that focuses on the field of desalination materials, processes, and associated technologies. It encompasses a wide range of disciplines and aims to publish exceptional papers in this area. The journal invites submissions that explicitly revolve around water desalting and its applications to various sources such as seawater, groundwater, and wastewater. It particularly encourages research on diverse desalination methods including thermal, membrane, sorption, and hybrid processes. By providing a platform for innovative studies, Desalination aims to advance the understanding and development of desalination technologies, promoting sustainable solutions for water scarcity challenges.