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

Year: 2026

Type: article

Abstract: High Resolution Image Download MS PowerPoint Slide Novel lithium-free gel metal fatty acid (M:FA, M = Co, Cu, and Fe) electrolytes were prepared for use in photosupercapacitor (PSC) applications. Cyclic voltammetry (CV) analysis revealed that the device using the Fe:FA gel electrolyte had a superior specific capacitance ( C p ) of 644 Fg –1 at 1 mVs –1 . However, for higher scan rates, the Cu:FA gel electrolyte-based PSC performed better compared to the other M:FA. Galvanostatic charge–discharge (GCD) experiments also provided values close to the moderate scan rates of CV experiments, with C p values obtained from GCD measurements under 20 Ag –1 and illumination conditions being 318, 265, and 252 Fg –1 for Cu, Co, and Fe:FA, respectively. Besides, to assess cyclic stability, devices were tested at a voltage of 1 V and a current density of 60 Ag -1 for 10,000 cycles. The C p retention was found to be 67%, 117%, and 55% of the original capacitance for Cu, Co, and Fe:FA PSCs, respectively, with almost 100% Coulombic efficiency for all PSCs. In line with all of these results, it was concluded that Cu and Fe:FA-based PSC devices combine high performance and durability with low cost and abundance in nature as an alternative to lithium-based electrolytes and shed light on future studies.

Source: ACS Omega

DOI: 10.1021/acsomega.5c10959

Authors: Emine Karagoz, Cemre Oztop, Deren Aydin, Cigdem Tuc Altaf, Nurdan Demirci Sankir, Mehmet Sankir

Institution: TOBB University of Economics and Technology

Language: English

Topic: Supercapacitor Materials and Fabrication

Subfield: Electronic, Optical and Magnetic Materials

Field: Materials Science

Domain: Physical Sciences

SDG: Affordable and clean energy

Open Access status: gold

Estimated APC paid: $1,935