Catalyst for Oxygen Reduction and Evolution Reactions and Method for Manufacturing the Same

Single-Crystal NiS2 Nanosheets with Exposed {200} Facets as Oxygen Reduction and Evolution Catalysts

This technology maximizes the catalytically active surface area by designing single-crystal NiS2 (nickel sulfide) nanosheets with exposed {200} facets in a two-dimensional structure to enhance the oxygen reduction reaction (ORR) and oxygen evolution reaction (OER) efficiency of lithium-air battery cathodes.

Conventional lithium-air batteries suffer from low energy efficiency due to a high overpotential gap between ORR and OER, and the high manufacturing costs of noble metal catalysts, such as platinum (Pt), used to address this issue have hindered commercialization.

By reacting Ni(OH)2 nanosheet precursors, synthesized via a hydrothermal method, with sulfur (S) powder through solid/gas-phase reactions, this technology produces structurally controlled single-crystal NiS2 nanosheets with exposed {200} facets. This ensures high activity, high stability, and low cost, providing a practical advantage in securing commercial competitiveness for lithium secondary battery cathode materials.

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Key Features:

• A catalyst composed of nickel disulfide nanosheets in which multiple nickel disulfide units are interconnected and arranged in a two-dimensional structure.
• A catalyst for oxygen reduction and oxygen evolution reactions, where the nickel disulfide nanosheets have a single-crystal structure with exposed {200} facets.
• A configuration that designs single-crystal nickel disulfide nanosheets with specific exposed facets into a two-dimensional structure.
• A nanosheet catalyst configured to increase the oxygen reduction and oxygen evolution efficiency of lithium-air battery cathodes.

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