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PROFESSOR K.Y. CHAN

Electrochemical Energy Storage System

Cheap and Efficient energy storage is essential for both Power Grid Interfacing and Automotive Industry

operating voltage of aqueous power sources have been limited by the electrochemical windows of water, theoretically 1.23 V at a fixed pH solution
high voltage multiple electrolytes battery consists of a lead acid positive electrode & a nickel metal hydride negative electrode, which is operated in separated acid & alkaline electrolyte via a bipolar membrane or two ion membranes, is shown to have higher voltage & higher capacity than the individual lead acid or nickel metal hydride cell

the MH(alkaline)/PbO2 (acid) rechargeable cell has OCV 2.65 V, stable operation at 2.4 V & repeated charging-discharging cycles


Schematic of A 3 electrolytes battery with: 1. Acid chambers (Left) 2. Neutral chambers (Center) & 3. Alkaline chambers (Right)	Prototype of dual electrolyte battery	Cell performances of 3 electrolytes battery & Lead acid battery

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