MUMBAI, India, March 13 -- Intellectual Property India has published a patent application (202621006048 A) filed by Indian Institute Of Science Education And Research, Bhopal, Madhya Pradesh, on Jan. 21, for 'a process for direct electrolysis of untreated natural seawater for selective oxygen evolution and anti-scaling.'
Inventor(s) include Mahesh Ijjada; and Vignesh Raja P.
The application for the patent was published on March 13, under issue no. 11/2026.
According to the abstract released by the Intellectual Property India: "The present invention relates to a process for the direct electrolysis of untreated natural seawater for sustainable hydrogen production. Conventional seawater electrolysis is hindered by preferential chloride oxidation at the anode and scaling at the cathode caused by calcium and magnesium precipitation. The disclosed process overcomes these challenges through electrolyte modification without requiring desalination or removal of dissolved ions. Natural seawater is supplemented with a phosphate-based additive and carbon dioxide to establish a controlled acidic buffering environment during electrolysis. This electrolyte configuration selectively promotes the oxygen evolution reaction while suppressing chloride oxidation, thereby reducing the formation of toxic chlorine-containing by-products. Simultaneously, the acidic environment inhibits hydroxide generation at the cathode, preventing calcium and magnesium scale formation during hydrogen evolution. The process is compatible with various electrode materials and operates at industrially relevant current densities. The invention provides a scalable, cost-effective, and water-efficient route for green hydrogen production from natural seawater."
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