Phytosynthesis of Co₃O₄ Nanoparticles as the High Energy Storage Material of an Activated Carbon/Co₃O₄ Symmetric Supercapacitor Device with Excellent Cyclic Stability Based on a Na₂SO₄ Aqueous Electrolyte

Abstract

The benign preparation of cobalt oxide nanoparticles (Co 3 O 4 -NPs) was performed using marine red algae extract ( Grateloupia sparsa ) as a simple, cost-effective, scalable, and one-pot hydrothermal technique. The nominated extract was employed as an environmental reductant and stabilizing agent. The resultant product showed the typical peak of Co 3 O 4 -NPs around 400 nm wavelength as ascertained by UV–vis spectroscopy. Size and morphological techniques combined with X-ray diffraction (XRD) showed the small size of Co 3 O 4 -NPs deformed in a spherical shape. The activated carbon (AC) electrode and Co 3 O 4 -NP electrode delivered a specific capacitance ( C sp ) of 125 and 182 F g –1 at 1 A g –1 , respectively. The energy density of the AC and AC/Co 3 O 4 electrodes with a power density of 543.44 and 585 W kg –1 was equal to 17.36 and 25.27 Wh kg –1 , respectively. The capacitance retention of designed electrodes was 99.2 and 99.5% after 3000 cycles. Additionally, a symmetric AC/Co 3 O 4 //AC/Co 3 O 4 supercapacitor device had a specific capacitance ( C sp ) of 125 F g –1 and a high energy density of 55 Wh kg –1 at a power density of 650 W kg –1 . Meanwhile, the symmetric device exhibited superior cyclic stability after 8000 cycles, with a capacitance retention of 93.75%. Overall, the adopted circular criteria, employed to use green technology to avoid noxious chemicals, make the AC/Co 3 O 4 nanocomposite an easily accessible electrode for energy storage applications.

The High Efficient Investigations of Properties of Co3O4 Nanostructured by Facile Spray Pyrolysis Technique for Future Gas Sensors Application

“…This behavior of the high dielectric constant of Co 3 O 4 showed the high ability of our Co 3 O 4 in the field of energy storage. [57,58] The imaginary dielectric constant (ε i ) values were %0.076, %0.126, %0.174, and %0.241 for deposition temperatures. This behavior is assigned to the increase of energy dissipation.…”

Intriguing and Facile Preparation Approach of CdO Nanorod-Based Abundant Chitosan for Symmetric Supercapacitors

“…Recently, the rapidly expanding economic growth, rising environmental pollution, and the use of fossil fuels are all critical issues for humanity, necessitating the urgent need for alternative energy sources and storage energy transformation. , Electrochemical energy storage (EES), also known as supercapacitors, has emerged as an innovative method of storing energy conversion . Since it has extended cycle stability, fast charge–discharge flux, and high power density, it is ideal for high-power uses; the EES system has played a critical role in the development of energy storage devices enabling upcoming portable electronic gadget technologies, hybrid electric autos, and all-electric vehicles. , Supercapacitors in an electrochemical system are categorized into electric double-layer capacitors (EDLCs) and electrochemical pseudocapacitors (EPCs).…”

Impact of Preprocessing of Graphene Additive via Ultrasonication on the Electrochemical Performance of Activated Carbon‐Based Supercapacitors

“…[ 6 ] However, despite its high surface area and mass availability, AC‐based EDLCs suffer from some shortcomings such as limited electrical conductivity and electrochemical performance. [ 9 ] Therefore, compositing AC with other materials such as carbon nanotubes (CNTs), [ 10 ] graphene, [ 11 ] CNTs and reduced graphite oxide, [ 12 ] Co 3 O 4 , [ 13 ] CeO 2 , [ 14 ] and RuO 2 [ 15 ] is a good strategy for enhancing the power and energy density of the fabricated SCs. Some metal oxides and CNTs are relatively expensive and not suitable for mass production.…”