Eco-Engineered Co3O4/CoO/C Nanohybrid for Supercapacitors and Efficient Water Splitting
Document Type
Article
Publication Date
2025
Abstract
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.
Recommended Citation
gomaa, islam and Abdelhamid, Hani Nasser, "Eco-Engineered Co3O4/CoO/C Nanohybrid for Supercapacitors and Efficient Water Splitting" (2025). Nanotechnology Research Centre. 215.
https://buescholar.bue.edu.eg/nanotech_research_centre/215