Enhanced Clean Energy Generation through Capacitive Electrode Utilization in Reverse Electrodialysis

Abstract In this study, we explore the potential of a novel energy generation method, Capacitive Reverse Electrodialysis (CRED), which combines seawater and river water to produce electricity. CRED integrates a membrane stack, similar to Reverse Electrodialysis (RED), with capacitive electrodes. The salinity gradient between the two water sources generates a potential difference across ion-selective membranes, enabling sustainable energy production. Unlike traditional RED systems that rely on redox reactions, CRED utilizes capacitive electrodes, preventing saturation and enhancing system longevity by periodically switching the water flows and reversing the direction of the electric current. The larger membrane stack in CRED allows for greater charge accumulation than previous capacitive mixing methods, leading to higher voltage and more efficient energy capture. As a result, CRED achieves a power density approximately ten times higher than previous capacitive power extraction trials, reaching performance levels comparable to or exceeding those of conventional RED systems with redox-based electrodes. Overall, CRED demonstrates a promising alternative to traditional energy generation methods, offering a stable, secure, environmentally friendly, and high-performance solution for harnessing energy from the mixing of saltwater and freshwater.