Cobalt and Nickel Phosphates as Multifunctional Air-Cathodes for Rechargeable Hybrid Sodium-Air Battery ApplicationsClick to copy article linkArticle link copied!
- Baskar Senthilkumar*Baskar Senthilkumar*E-mail: [email protected] (B.S.).Laboratoire de Réactivité et Chimie des Solides (LRCS), CNRS UMR 7314, Université de Picardie Jules Verne, 33 Rue Saint Leu, 80039 Amiens Cedex, FranceMore by Baskar Senthilkumar
- Ahamed Irshad*Ahamed Irshad*E-mail: [email protected] (A.I.).Loker Hydrocarbon Research Institute, Department of Chemistry, University of Southern California, Los Angeles, California 90089, United StatesMore by Ahamed Irshad
- Prabeer Barpanda*Prabeer Barpanda*E-mail: [email protected] (P.B.).Faraday Materials Laboratory, Materials Research Centre, Indian Institute of Science, C.V. Raman Avenue, Bangalore 560012, IndiaMore by Prabeer Barpanda
Abstract

Noble-metal-free bifunctional electrocatalysts are indispensable to realize low-cost and energy-efficient rechargeable metal-air batteries. In addition, power density, energy density, and cycle life of these metal-air batteries can be improved further by utilizing the fast faradaic reactions of metal ions in the catalyst layer together with the oxygen evolution/reduction reactions (OER/ORR) for charge storage. In this work, we propose mixed metal phosphates of nickel and cobalt, NixCo3–x(PO4)2 (x = 0,1, 1.5, 2, and 3), as multifunctional air-cathodes exhibiting bifunctional electrocatalytic activity and reversible metal redox reaction (M3+/2+, M = Ni and Co). Submicron-sized NixCo3–x(PO4)2 particles were synthesized by a solution combustion synthesis technique with urea acting as the fuel. Electrocatalytic activity toward the oxygen evolution reaction (OER) and oxygen reduction reaction (ORR) in 0.1 M NaOH was systematically tuned by varying the Ni-to-Co ratio. The synthesized NixCo3–x(PO4)2 with x = 1.5 (NCP11) showed superior bifunctional catalytic activity to other samples. Moreover, the catalyst material delivered a specific capacity of ∼110 mAh g–1 by the redox reactions of its metal sites. The hybrid Na-air battery fabricated using the NCP11 catalyst-loaded air-cathode exhibited low overpotential, stable cycling performance, and round-trip energy efficiency exceeding 78% in a 0.1 M NaOH aqueous electrolyte.
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