Kim, Sung-Hyun Lee, Yang-Woo Kim, Donghyeok Won, Jong-Bin Son, Jeong Gon Cho, Jinhan So, Ju-Hee Koo, Hyung-Jun 2026-01-15T10:00:43Z 2026-01-15T10:00:43Z 2026-01-12 2025-12 0363-907X https://pubs.kist.re.kr/handle/201004/154053 Inspired by the electrical discharge mechanism of electric fish, we report a bio-inspired power source based on agarose hydrogels. The device generates electrical energy by exploiting ion concentration gradients across high- and low-salinity hydrogels, in combination with polyelectrolyte membrane gels exhibiting ion selectivity based on Donnan exclusion. Systematic optimization of hydrogel composition identified optimal ion concentrations and agarose content that balance energy output and mechanical stability. To further enhance performance, asymmetric redox pairs-ferrocyanide/ferricyanide at the anode and vanadium oxide at the cathode-were introduced, boosting both voltage and current outputs. Additionally, a continuous flow system was incorporated to replenish ionic gradients, addressing limitations from ion gradient depletion during extended operation. Simulations and experimental results confirmed that the flow-assisted configuration maintained stable ion distributions, enabling sustained power output over time. This work demonstrates a safe, scalable, and environmentally friendly platform for water-based energy harvesting, with potential applications in bio-interfacing and soft energy devices. English John Wiley & Sons Inc. Agarose Hydrogel-Based Power Source: Electrode Potential Engineering and Flow System Integration for Enhanced and Sustained Performance Article 10.1155/er/8352032 1 International Journal of Energy Research, v.2025, no.1 International Journal of Energy Research 2025 1 Y scie scopus 001644560600001 2-s2.0-105025591793 Energy & Fuels Nuclear Science & Technology Energy & Fuels Nuclear Science & Technology Article SALINITY GRADIENTS NETWORK HYBRID GENERATION agarose hydrogels electric fish flow systems ion gradients ion-selective membranes redox pairs