Abstract
Salinity Gradient Power (SGP) is one such power, which is environmentally sound as well as sustainable, that can be generated from reversible mixing of two kinds of water with different salt concentrations. This Reverse Electrodialysis (RED) technology uses a concentration gradient to derive a potential. The salinity gradient is created using a fuel cell type cell with a micro-porous ion exchange membrane, both anionic (AEM) and cationic (CEM). The study was performed for various gradients. Salt : Fresh, from 100 : 0 to 16000 : 0 was established using NaCl solution, in the electrode chambers. A potential of 25mV/cm was realized at ambient temperatures and pressures for a bipolar AEM/CEM cell. The achievable potential is still below theoretical values. The higher the salinity gradient the larger is the potential generated. This is limited by the membrane characteristics. This process is a unique technology for potential generation.
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