Electrochemical capacitance properties of pre-sodiated manganese oxide for aqueous Na-ion supercapacitors

Nechikott, Aneesh Anand; Nayak, Prasant Kumar

doi:10.1039/d3ra01657a

Cited by 6 publications

(1 citation statement)

References 66 publications

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“…Manganese is the preferred material for electrochemical and energy applications owing to its low cost, abundance in the Earth's crust, enhanced potential window exhibiting high energy densities, environmentally friendly nature, and high theoretical capacity [7,8]. Manganese exhibits several stable oxidation states, such as MnO, MnO 2 , Mn 2 O 3 , and Mn 3 O 4 , which possess varied electrochemical properties [9]. Manganese also exhibits intercalation and deintercalation of electrolyte ions in the electrode material owing to the transition between Mn 4+ /Mn 3+ ions, which leads to enhanced charge storage properties [10].…”

Section: Introductionmentioning

confidence: 99%

MnO/Mn2O3 Aerogels as Effective Materials for Supercapacitor Applications

Ramkumar,

Suganthi,

Milton

et al. 2024

Energies

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Mixed-oxide transition-metal aerogels (AGLs), particularly manganese-based AGLs, have attracted considerable interest over the past decade owing to their extraordinary properties, including high porosity, good surface area, and ultralow density. To develop easy and lightweight materials for the ever-increasing energy storage demands of the near future, we designed a novel Mn-based electrode material to meet these rising requirements. MnO/Mn2O3 AGLs were synthesized using a novel borohydride hydrolysis method and then annealed at 200, 400, and 550 °C. The as-synthesized AGLs yielded flower-like network structures, but their porosity increased with increasing temperatures, to a high temperature of 400 °C. This increased porosity and network structure facilitate a high capacitance. A supercapacitor (SC) constructed with the three-electrode material yielded 230 F/g for the MnAGL@400 sample, followed by yields from the MnAGL@200 and MnAGL@550 electrodes. Furthermore, the device constructed with MnAGL@400 exhibited an energy density of 9.8 Wh/kg and a power density of ~16,500 W/kg at a current density of 20 A/g. The real-time applicability of the AGL was demonstrated by engineering a two-electrode device employing MnAGL@400 as the positive electrode, which exhibited 97% capacity retention and 109% Coulombic efficiency over 20,000 cycles.

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