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<p>Developing high-performance, dual-functional electrode materials through sustainable synthesis routes is pivotal for advancing next-generation energy technologies. Herein, we present an eco-engineered Co<sub>3</sub>O<sub>4</sub>/CoO/C nanohybrid synthesized via an ultrasound-assisted low-thermal method, offering spinel Co<sub>3</sub>O<sub>4</sub> (44&#xa0;nm crystallites) and Mott-like CoO (5.7&#xa0;nm crystallites) within carbon. The materials&#xa0; were characterized by XRD, FT-IR, and SEM/EDX. Data analysis reveals coherent interfaces with minimized lattice strain (0.1–1.965%) and defect-rich phase boundaries, enabling synergistic Co<sup>3</sup>⁺/Co<sup>2</sup>⁺ redox cycling and carbon-enhanced conductivity. The electrochemical characterization reveals exceptional supercapacitive performance, achieving specific capacitances of 1611 F g⁻<sup>1</sup> (using graphite as counter electrode) and 2416 F g⁻<sup>1</sup>(Pt) at current density of&#xa0;1 A g⁻<sup>1</sup>, alongside 98% capacitance retention over 5000 cycles at 10 A g⁻<sup>1</sup>. As an electrocatalyst, the nanohybrid demonstrates a low oxygen evolution reaction (OER) overpotential of 327&#xa0;mV at 10&#xa0;mA&#xa0;cm⁻<sup>2</sup> in alkaline media. The hierarchical porosity (398&#xa0;nm average pore size) and nanosheet morphology (&lt; 5&#xa0;nm thickness) facilitate rapid ion diffusion and maximize active-site accessibility. This study bridges phase engineering with green synthesis to create dual-function energy materials, demonstrating promising potential for seawater applications.</p>

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Eco-Engineered Co3O4/CoO/C Nanohybrid for Supercapacitors and Efficient Water Splitting

  • 期刊论文

  • 发表日期：

    2025年9月28日

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  • Raiedhah A. Alsaiari,
  • Islam Gomaa,
  • Hani Nasser Abdelhamid

摘要

Developing high-performance, dual-functional electrode materials through sustainable synthesis routes is pivotal for advancing next-generation energy technologies. Herein, we present an eco-engineered Co3O4/CoO/C nanohybrid synthesized via an ultrasound-assisted low-thermal method, offering spinel Co3O4 (44 nm crystallites) and Mott-like CoO (5.7 nm crystallites) within carbon. The materials  were characterized by XRD, FT-IR, and SEM/EDX. Data analysis reveals coherent interfaces with minimized lattice strain (0.1–1.965%) and defect-rich phase boundaries, enabling synergistic Co3⁺/Co2⁺ redox cycling and carbon-enhanced conductivity. The electrochemical characterization reveals exceptional supercapacitive performance, achieving specific capacitances of 1611 F g⁻1 (using graphite as counter electrode) and 2416 F g⁻1(Pt) at current density of 1 A g⁻1, alongside 98% capacitance retention over 5000 cycles at 10 A g⁻1. As an electrocatalyst, the nanohybrid demonstrates a low oxygen evolution reaction (OER) overpotential of 327 mV at 10 mA cm⁻2 in alkaline media. The hierarchical porosity (398 nm average pore size) and nanosheet morphology (< 5 nm thickness) facilitate rapid ion diffusion and maximize active-site accessibility. This study bridges phase engineering with green synthesis to create dual-function energy materials, demonstrating promising potential for seawater applications.