Key Words:EXCHANGE MEMBRANES; SALINITY; NANOCHANNELS

Abstract:The utilization of reverse electrodialysis (RED) technology for efficient conversion of salinity-gradient energy represents a promising strategy for advancing green and low-carbon energy development. The key challenge of RED technology lies in the fabrication of high-performance ion exchange membranes that possess both large surface areas and long-term stability. Silk fibroin (SF), characterized by their abundance of negative charges, ease of processability, and robust mechanical properties, make them particularly suitable for use in energy harvesting through ion permeation. However, a critical limitation in the application of SF membranes is the artificial control of their pore size, which constrains their performance and scalability. Herein, we propose a novel approach for fabricating SF membranes with tunable pore sizes by integrating ionic liquid (IL) with SF. Upon immersion in pure water, the IL dissolve, creating ion transport channels within the membrane. The dimensions of these transport channels can be precisely regulated by adjusting the ratio of IL to SF, thereby enabling control over the membrane's output power density. Under simulated seawater/river water conditions, the resulting SF membrane demonstrates a stable output power density of 9.6 W/m2. This straightforward strategy presents a promising approach for enhancing the efficiency of salinity-gradient energy harvesting.

Volume:532

Issue:

Translation or Not:no