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Hierarchical nanostructured NiCo2O4 as an efficient bifunctional non-precious metal catalyst for rechargeable zinc-air batteries
- Hierarchical nanostructured NiCo2O4 as an efficient bifunctional non-precious metal catalyst for rechargeable zinc-air batteries
- Prabu, Moni; Ketpang, Kriangsak; Shanmugam, Sangaraju
- DGIST Authors
- Shanmugam, Sangaraju
- Issue Date
- Nanoscale, 6(6), 3173-3181
- Article Type
- Air; Bi-Functional Electrocatalysts; Catalysis; Catalyst Activity; Cathodes; Chemistry; Cobalt; Cobalt Oxide; Electric Batteries; Electric Power Supplies; Electrocatalysts; Electrocatalytic Activity; Electrochemical Analysis; Electrochemical Techniques; Electrode; Electrodes; Electrolytic Reduction; Electrospinning Techniques; Metal Acetylacetonates; Morphology; Nano-Structures; Nanomaterial; Nickel; Nickel Monoxide; Non-Precious Metal Catalysts; Oxide; Oxides; Oxygen Reduction and Evolution; Porosity; Power Supply; Precious Metals; Precursor Concentration; Rechargeable Zinc-Air Batteries; Zinc
- A nickel-doped cobalt oxide spinel structure is a promising non-precious metal electrocatalyst for oxygen evolution and oxygen reduction in rechargeable metal-air batteries and water electrolyzers operating with alkaline electrolytes. One dimensional NiCo2O4 (NCO) nanostructures were prepared by using a simple electrospinning technique with two different metal precursors (metal nitrate/PAN and metal acetylacetonate/PAN). The effect of precursor concentration on the morphologies was investigated. Single-phase, NCO with an average diameter of 100 nm, porous interconnected fibrous morphology was revealed by FESEM and FETEM analysis. The hierarchical nanostructured 1D-spinel NiCo2O4 materials showed a remarkable electrocatalytic activity towards oxygen reduction and evolution in an aqueous alkaline medium. The extraordinary bi-functional catalytic activity towards both ORR and OER was observed by the low over potential (0.84 V), which is better than that of noble metal catalysts [Pt/C (1.16 V), Ru/C (1.01 V) and Ir/C (0.92 V)], making them promising cathode materials for metal-air batteries. Furthermore, the rechargeable zinc-air battery with NCO-A1 as a bifunctional electrocatalyst displays high activity and stability during battery discharge, charge, and cycling processes. © The Royal Society of Chemistry.
- Royal Society of Chemistry
- Related Researcher
Advanced Energy Materials Laboratory
Electrocatalysts for fuel cells; water splitting; metal-air batteries; Polymer electrolyte membranes for fuel cells; flow batteries; Hydrogen generation and utilization
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- Department of Energy Science and EngineeringAdvanced Energy Materials Laboratory1. Journal Articles
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