Enhanced selective ion transport by assembling nanofibers to membrane pairs with channel-like nanopores for osmotic energy harvesting. (1st December 2022)

• Record Type: Journal Article
• Authors: Zhang, Minghao; Sheng, Nan; Song, Qun; Zhang, Hua; Chen, Shiyan; Wang, Huaping; Zhang, Kai
• Is Part Of: Nano energy. Volume 103(2022)Part A
• Publication Date: 2022-12-01
• Subjects: Nanofluid -- Reverse electrodialysis -- Channels -- Surface charge density -- Osmotic energy; Nanoscience -- Periodicals; Nanotechnology -- Periodicals; Nanostructured materials -- Periodicals; Power resources -- Technological innovations -- Periodicals; Nanoscience; Nanostructured materials; Nanotechnology; Power resources -- Technological innovations; Periodicals; 621.042
• DOI: 10.1016/j.nanoen.2022.107786
• Languages: English
• ISSNs: 2211-2855

Abstract

Abstract: Nanofluid reverse electrodialysis (RED) is considered the most promising technology for harvesting osmotic energy. As materials used for RED, natural nanofluid materials are renewable but suffer from low power densities due to weak surface charge densities or irregular ion transport channels, while advanced materials from sophisticated manufacturing are too expensive. Here, a pair of novel natural nanofluid membranes with channel-like nanopores for highly improved selective ion transport were developed by assembling negatively and positively charged bacterial cellulose nanofibers via a space-confined flattened extrusion process. The regular internal channel-like nanopores with strongly increased surface charges assured less electrical imperfectness and therefore high ion selectivity, leading to RED systems with a high output power density of 0.72 W m −2 (5.58 W m −2 of negatively charged membranes), far superior to other existing natural nanofluidic RED systems. This strategy of efficiently enhancing the selective ion transport will open up a new route for the development of nanofluidic RED devices, and allows a wide range of their applications in other energy fields. Graphical Abstract: ga1 Highlights: The cylindrical channel-like nanopore structures are more electrically "perfect". Modification of natural materials to achieve very high Zeta potential. The power density is much higher than reported pure natural nanofluidic RED devices.