Improving of the electrochemical performance of acacia wood porous carbon/MnO2 nanocomposite as an advanced electrode for supercapacitor and oxygen evolution reaction

• Published in: Electrochimica acta 2024-08, Vol.495, p.144459, Article 144459
• Main Authors: Hamouda, Hamouda Adam, Ramadan, Anas, Mokhtar, Leila Mahmoud, Ageeb, Suad Atitalla, Ibrahim, Mohammed Hassan, Ajab, Abir EM, Hussein, Mohammed Bahreldin, Farah, Adam A., Hassan, Elfatih A, Ma, Guofu
• Format: Article
• Language: English
• Subjects: Active carbon; ASC; AWPC/MnO2; Energy density; Nanocomposites; Oxygen evolution reaction
• ISSN: 0013-4686; 1873-3859
• DOI: 10.1016/j.electacta.2024.144459

Effective energy storage has now become increasingly critical as global energy demand has skyrocketed. Asymmetric supercapacitors using electrodes made of acacia wood-derived carbon doped with MnO2. A hydrothermal process was used to synthesize the AWPC/MnO2 composite. Techniques such as XRD, SEM, TEM, XPS, FTIR spectra, Ramman spectra, and N2 adsorption-desorption isotherms. We looked at the electrochemical properties of the materials we made in an electrolyte using cyclic voltammetry (CV), galvanostatic charge-discharge (GCD), and electrochemical impedance spectroscopy (EIS). A hydrothermal synthesis approach is used to graft MnO2 wire-like nanostructures onto acacia wood-derived activated carbon. Good electrochemical performance is shown by the carbon/MnO2 hybrid composite electrode, which has high specific capacitances of 301 F g−1 at 500 mA s−1, low Tafel slope of 54 mV dec−1, which is attributed to the synergistic influences between MnO2 and waste biomass-produced carbon. Moreover, an asymmetric supercapacitor operating in the voltage range of 1.8 V and exhibiting a high energy density of 25 Wh kg−1 at a power density of 450 W kg−1 demonstrates the significant potential of the activated carbon/MnO2 composite generated from synthesized biomass. The AWPC/MnO2's oxygen evolution reaction (OER) activity was checked to see how well the improved nanostructure could be used. The results offer a fresh perspective on the fabrication of electrochemical energy storage devices with outstanding performance.