Enhanced energy storage for nano-structural porous MnO2//AC/MWCNTs asymmetric hybrid supercapacitor device in Na2SO4 aqueous electrolyte

Maher, Mahmoud; Yousif, Bedir; Abo-Elsoud, M.A.; Hassan, Sameh

doi:10.1007/s10854-021-07156-y

Cited by 8 publications

(1 citation statement)

References 83 publications

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“…[2] To enable their large-scale deployment, it is imperative to employ cost-effective, durable safe materials and electrolytes, [3] especially aqueous ones (for the latter) since they are intrinsically safe and compatible. With regards to stable materials in neutral aqueous electrolytes, activated carbon (AC) and manganese dioxide (MnO 2 ) in symmetrical, [4] asymmetrical, [5] or hybrid [6] systems have been successfully implemented.…”

Section: Introductionmentioning

confidence: 99%

Characterization of Manganese Acetate Hydrate Solutions and Their Potential Use for Energy Storage Applications

Tachouaft,

Kahri,

Wang

et al. 2024

Batteries & Supercaps

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This study provides a comprehensive understanding of the thermal, volumetric, and transport properties of manganese acetate hydrate solutions and highlights their potential for use in energy storage applications. Noteworthy thermal behaviours, phase transitions, and strong interactions between manganese cations, acetate anions, and water molecules are observed. Transport properties reveal salt concentration's impact (0.4‐3.9 mol L‐1) on viscosity and conductivity, with higher concentrations (>2.5 mol L‐1) indicating increased interaction. The non‐Arrhenius behavior in conductivity is elucidated using the Vogel‐Fulcher‐Tammann model, accentuating the unique properties of these solutions compared to other aqueous electrolytes due to the role of acetate ligands. The formulated two‐electrode symmetric supercapacitors exhibit pseudocapacitive behavior, reversible redox reactions (Mn2+/Mn3+), and salt concentration‐dependent specific capacitance. Manganese acetate as an electrolyte leads to reversible MnO2 deposition, with concentration affecting redox reactions and capacitance. Molecular simulations support the observed electrochemical performance, emphasizing the Mn2+‐acetate complexation. Long‐term cycling experiments demonstrate stability over 2000 cycles, with a slight capacitance improvement (130 F g‐1) and gradual coulombic efficiency decrease (99%). These results underscore the potential of manganese acetate hydrate solutions as a stable and effective green electrolyte for energy storage applications.

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