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<p>Development of facile and cost-effective methods for the preparation of electrode materials are highly important for commercial energy storage and conversion applications. Herein, we develop a liquid-free synthesis of nickel cobalt oxide (NiCo₂O₄) nanostructures using a simple mixing and pyrolysis of metal salt precursors. The liquid-free synthesized NiCo₂O₄ showed truncated rhombohedral morphology with good crystallinity and uniformity. The NiCo₂O₄ exhibited a maximum specific capacitance of 306.1 F/g at 1 A/g with battery-like redox behaviour with good rate capability. Additionally, the faradaic electrode showed good cycling stability with a capacitance retention of 96.3% after 10,000 charge–discharge cycles. Furthermore, the NiCo₂O₄ nanostructures was used as an electrocatalyst, which showed superior electrocatalytic performance in alkaline electrolyte with a low Tafel slope of 80&#xa0;mV/dec and reduced charge-transfer resistance. These electrochemical features are attributed to the porous interconnected nanostructures, good electrochemical active sites, and efficient ion/electron transport provided by NiCo₂O₄ electrode. Overall, the dry-synthesis method is scalable, and eliminates hazardous solvents, making it is ideal for large-scale production of electrode materials for next-generation energy storage and conversion applications.&#xa0;</p>

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Liquid-free simple synthesis of nickel cobaltite nanostructures for high-performance supercapacitors and electrocatalyst applications

  • 期刊论文

  • 发表日期：

    2025年6月24日

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  • Muneerah Al-Aqeel

摘要

Development of facile and cost-effective methods for the preparation of electrode materials are highly important for commercial energy storage and conversion applications. Herein, we develop a liquid-free synthesis of nickel cobalt oxide (NiCo₂O₄) nanostructures using a simple mixing and pyrolysis of metal salt precursors. The liquid-free synthesized NiCo₂O₄ showed truncated rhombohedral morphology with good crystallinity and uniformity. The NiCo₂O₄ exhibited a maximum specific capacitance of 306.1 F/g at 1 A/g with battery-like redox behaviour with good rate capability. Additionally, the faradaic electrode showed good cycling stability with a capacitance retention of 96.3% after 10,000 charge–discharge cycles. Furthermore, the NiCo₂O₄ nanostructures was used as an electrocatalyst, which showed superior electrocatalytic performance in alkaline electrolyte with a low Tafel slope of 80 mV/dec and reduced charge-transfer resistance. These electrochemical features are attributed to the porous interconnected nanostructures, good electrochemical active sites, and efficient ion/electron transport provided by NiCo₂O₄ electrode. Overall, the dry-synthesis method is scalable, and eliminates hazardous solvents, making it is ideal for large-scale production of electrode materials for next-generation energy storage and conversion applications.