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Lithium-Free Metal Fatty Acid-Based Electrolytes for Quasi-Solid-State Photosupercapacitors.

Emine Karagoz1, Cemre Oztop2, Deren Aydin2

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Novel lithium-free gel electrolytes using cobalt, copper, and iron fatty acids were developed for photosupercapacitors. Copper and iron-based electrolytes show promise as durable, cost-effective alternatives to lithium-ion technologies.

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Area of Science:

  • Materials Science
  • Electrochemistry
  • Energy Storage

Background:

  • Traditional lithium-based electrolytes pose cost and availability challenges for energy storage devices.
  • Photosupercapacitors (PSCs) offer a promising avenue for renewable energy harvesting and storage.

Purpose of the Study:

  • To develop novel, lithium-free gel electrolytes based on metal fatty acids (M:FA, M = Co, Cu, Fe) for PSC applications.
  • To evaluate the electrochemical performance and cyclic stability of these M:FA electrolytes in PSCs.

Main Methods:

  • Preparation of lithium-free gel electrolytes using cobalt, copper, and iron fatty acids.
  • Electrochemical characterization using cyclic voltammetry (CV) and galvanostatic charge-discharge (GCD) at various scan rates and current densities.
  • Assessment of cyclic stability over 10,000 cycles at a fixed voltage and current density under illumination.

Main Results:

  • Fe:FA electrolytes exhibited a high specific capacitance (Cp) of 644 Fg⁻¹ at 1 mVs⁻¹ in CV analysis.
  • Cu:FA electrolytes demonstrated superior performance at higher scan rates and maintained Cp values of 318 Fg⁻¹ under GCD at 20 Ag⁻¹.
  • Cu:FA PSCs showed 67% Cp retention after 10,000 cycles, while Co:FA PSCs surprisingly showed 117% retention, indicating potential for further investigation.

Conclusions:

  • Copper (Cu) and Iron (Fe) based fatty acid gel electrolytes are viable, low-cost, and abundant alternatives to lithium-based electrolytes for photosupercapacitor applications.
  • These M:FA electrolytes offer a combination of high performance and durability, paving the way for future research in sustainable energy storage.