Porous magnesium oxide composite for high-performance electrochemical energy storage

Abstract
In this study, a porous magnesium oxide composite (CMnAz) was synthesized via a simple and eco-friendly sol–gel method using azodicarbonamide (Az) as a nitrogen source. The CMnAz composite was integrated onto activated carbon cloth (ACC) to fabricate a flexible electrode for high-performance supercapacitors. Comprehensive structural characterizations, including SEM, TEM, SAED, XPS, FTIR, and BET, confirmed the high porosity, crystallinity, and compositional integrity of the composite. Electrochemical analyses revealed a specific capacitance of 450 F g−1 at 1 A g−1, with excellent rate capability (64 % retention at 20 A g−1) and cycling stability (about 88 % capacitance retention after 10000 cycles). The device also demonstrated a high energy density of 25 Wh kg−1 and a maximum power density of 16 kW kg−1, outperforming many existing ACC-based supercapacitor systems. Additional voltage-holding and self-discharge tests confirmed the structural stability and low leakage characteristics of the device. These findings underscore the potential of CMnAz/ACC composites as promising candidates for next-generation energy storage devices.

Author
Ali Ebrahimi Pure

DOI
https://doi.org/10.1016/j.ijhydene.2025.04.292

ISSN

Publish Date: 2025-04-27