Improvement in the Power Output of a Reverse Electrodialysis System by the Addition of Poly(sodium 4-styrenesulfonate)

• Published in: Denki kagaku oyobi kōgyō butsuri kagaku Vol. 89; no. 5; pp. 467 - 471
• Main Authors: KITAZUMI, Yuki, SHIRAI, Osamu, SOWA, Keisei, YAMADA, Yusuke
• Format: Journal Article
• Language: English
• Published: Tokyo The Electrochemical Society of Japan 05.09.2021; Japan Science and Technology Agency
• Subjects: Dilution; Electric contacts; Electrical resistivity; Electrodialysis; Energy; Energy dissipation; Energy loss; Poly(sodium 4-styrenesulfonate); Renewable energy; Reverse Electrodialysis; Rivers; Salinity; Salinity effects; Salinity Gradient Energy; Seawater; Sodium Chloride
• ISSN: 1344-3542; 2186-2451
• DOI: 10.5796/electrochemistry.21-00073

Salinity gradient energy generated by the contact between seawater and river water is one of the promising renewable energies. In the reverse electrodialysis (RED), salinity gradient energy is directly translated into the electricity. The representative problem is a large electrical resistance of river water or dilute solutions. The dilute solutions are poor electrically conductive. This results in a huge energy loss when an electrical current passes through it.In this study, sodium chloride (NaCl) or poly(sodium 4-styrenesulfonate) (NaPSS) was added to the dilute solutions to increase the conductivities and enhance the power outputs of the RED cells. When NaCl was added, the power output reached 11.4 ± 0.6 µW. On the other hand, when NaPSS was added, the power output increased up to 19.6 ± 0.6 µW.