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<p>Optimizing the processes for obtaining electroactive materials is essential in developing efficient energy storage devices. In this context, materials with hierarchical core@shell structures have proven to be a strategic alternative for the composition of positive electrodes in electrochemical systems, thus effectively meeting the emerging needs of these devices. Herein, we report the design of core@shell structures based on NiCo<sub>2</sub>O<sub>4</sub> and MOF-derived CoNi-LDH composites, using a procedure with precise deposition control and minimal material waste on Ni foam substrates. The NiCo<sub>2</sub>O<sub>4</sub>@CoNi-LDH core@shell material exhibited a specific capacity of <i>ca</i>. 81.82&#xa0;mA h g <sup>−1</sup> at 1.0 A g <sup>−1</sup>. At the same time, we verified capacity retention of <i>ca</i>. 78% after conducting 10,000 consecutive charge–discharge cycles at 20 A g <sup>−1</sup>. These findings demonstrate the excellent stability and charge-storage characteristics exhibited by the core@shell composite material. Furthermore, an asymmetric pseudocapacitor was assembled using NiCo<sub>2</sub>O<sub>4</sub>@CoNi-LDH as the anode and AC as the cathode, exhibiting maximum specific energy of 0.25 W h kg<sup>−1</sup> and power of 1,198 W kg <sup>−1</sup>, respectively, highlighting the excellent characteristics of NiCo<sub>2</sub>O<sub>4</sub>@CoNi-LDH for advanced energy storage applications requiring high power performance.</p>

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Facile and controlled deposition of MOF-derived CoNi-LDH on NiCo2O4 for core–shell architectures in advanced energy storage devices

  • 期刊论文

  • 发表日期：

    2025年12月25日

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  • Cristiane G. Silva,
  • Raissa Venâncio,
  • Raylander R. da Silva,
  • Niélcio B. S. Filho,
  • Leonardo Morais Da Silva,
  • Hudson Zanin,
  • Paulo R. Martins

摘要

Optimizing the processes for obtaining electroactive materials is essential in developing efficient energy storage devices. In this context, materials with hierarchical core@shell structures have proven to be a strategic alternative for the composition of positive electrodes in electrochemical systems, thus effectively meeting the emerging needs of these devices. Herein, we report the design of core@shell structures based on NiCo2O4 and MOF-derived CoNi-LDH composites, using a procedure with precise deposition control and minimal material waste on Ni foam substrates. The NiCo2O4@CoNi-LDH core@shell material exhibited a specific capacity of ca. 81.82 mA h g −1 at 1.0 A g −1. At the same time, we verified capacity retention of ca. 78% after conducting 10,000 consecutive charge–discharge cycles at 20 A g −1. These findings demonstrate the excellent stability and charge-storage characteristics exhibited by the core@shell composite material. Furthermore, an asymmetric pseudocapacitor was assembled using NiCo2O4@CoNi-LDH as the anode and AC as the cathode, exhibiting maximum specific energy of 0.25 W h kg−1 and power of 1,198 W kg −1, respectively, highlighting the excellent characteristics of NiCo2O4@CoNi-LDH for advanced energy storage applications requiring high power performance.