Exploration of cobalt phosphate as a potential catalyst for rechargeable aqueous sodium-air battery
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Journal of Power Sources, ISSN: 0378-7753, Vol: 311, Page: 29-34
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- Energy; Chemistry; Engineering; Aqueous electrolyte; Cobalt phosphate; Electrocatalyst; Sodium super ionic conductor; Sodium-air battery
Bifunctional catalysts are prominent to attain high capacity, maximum energy efficiency and long cycle-life for aqueous rechargeable Na-air batteries. In this work, we report the synthesis of bi-functional noble metal free, Co 3 (PO 4 ) 2 nanostructures by facile precipitation technique and evaluated its electrocatalytic activity. Co 3 (PO 4 ) 2 nanostructure was investigated as a potential electrocatalyst for rechargeable aqueous Na-air battery for the first time. The synthesized Co 3 (PO 4 ) 2 grain-like nanostructures showed better oxygen evolution activity compared to Pt/C catalyst. The fabricated Na-air battery with the Co 3 (PO 4 ) 2 catalyst as air-cathode delivered low overpotential and its round trip energy efficiency reached up to 83%. The Na-air battery exhibited stable cycle performance up to 50 cycles.