Gel-Based Materials for Energy Storage

A special issue of Gels (ISSN 2310-2861). This special issue belongs to the section "Gel Applications".

Deadline for manuscript submissions: 10 September 2026 | Viewed by 531

Special Issue Editors


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Guest Editor
School of Chemical Engineering, Yeungnam University, Gyeongsan 712-749, Republic of Korea
Interests: supercapacitors; thin-film solar cells; copper; chalcopyrite; electrochromism
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Special Issue Information

Dear Colleagues,

The rapid growth of renewable energy technologies and portable electronics has intensified the global demand for advanced energy storage systems that are safe, sustainable, and efficient. Among the various strategies, gel-based materials have emerged as highly promising candidates due to their unique combination of solid-like mechanical stability and liquid-like ionic conductivity. Their tunable structures, flexibility, and compatibility with diverse electrochemical systems make them ideal for next-generation batteries, supercapacitors, and hybrid energy devices.

This Special Issue, “Gel-Based Materials for Energy Storage”, aims to highlight the latest progress in the design, synthesis, and application of gel electrolytes, gel-based electrodes, and multifunctional hybrid gels. We welcome contributions that address fundamental mechanisms of ion transport, interfacial chemistry, and electrochemical performance, as well as studies exploring innovative fabrication methods, sustainable materials, and device integration strategies. Special attention will be given to works demonstrating enhanced safety, flexibility, and scalability of gel-based systems for practical applications.

By bringing together state-of-the-art research, this Special Issue seeks to provide a platform for advancing gel-assisted energy storage technologies and inspiring new directions in materials design. We invite both original research articles and comprehensive reviews that reflect the dynamic growth of this exciting field.

Dr. Pritam J. Morankar
Prof. Dr. Chanwook Jeon
Guest Editors

Manuscript Submission Information

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Keywords

  • gel electrolytes
  • energy storage materials
  • supercapacitors
  • rechargeable batteries
  • flexible energy devices
  • electrochemical energy storage
  • sustainable materials
  • hybrid gel systems
  • ion transport mechanisms
  • next-generation energy technologies

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Published Papers (1 paper)

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Research

24 pages, 4939 KB  
Article
Engineering Rare Earth-Assisted Cobalt Oxide Gels Toward Superior Energy Storage in Asymmetric Supercapacitors
by Pritam J. Morankar, Rutuja U. Amate, Aviraj M. Teli, Aditya A. Patil, Sonali A. Beknalkar and Chan-Wook Jeon
Gels 2025, 11(11), 867; https://doi.org/10.3390/gels11110867 - 29 Oct 2025
Cited by 1 | Viewed by 444
Abstract
The rational design of transition metal oxides with tailored electronic structures and defect chemistries is critical for advancing high-performance supercapacitors. Herein, we report the engineering of cobalt oxide (Co3O4) gels through controlled sol–gel synthesis and rare earth (RE) incorporation [...] Read more.
The rational design of transition metal oxides with tailored electronic structures and defect chemistries is critical for advancing high-performance supercapacitors. Herein, we report the engineering of cobalt oxide (Co3O4) gels through controlled sol–gel synthesis and rare earth (RE) incorporation using neodymium (Nd), gadolinium (Gd), and dual neodymium/gadolinium (Nd/Gd) doping. X-ray diffraction (XRD) confirmed the preservation of the cubic spinel structure with systematic peak shifts and broadening, evidencing lattice strain, oxygen vacancy generation, and defect enrichment. Field-emission scanning electron microscopy (FE-SEM) analyses revealed distinct morphological evolution from compact nanoparticle assemblies in pristine Co3O4 to highly porous, interconnected frameworks in Nd/Gd–Co3O4 (Nd/Gd-Co). X-ray photoelectron spectroscopy (XPS) verified the stable incorporation of RE ions, accompanied by electronic interaction with the Co–O matrix and enhanced oxygen defect states. Electrochemical measurements demonstrated that the Nd/Gd–Co electrode achieved a remarkable areal capacitance of 25 F/cm2 at 8 mA/cm2, superior ionic diffusion coefficients, and the lowest equivalent series resistance (0.26 Ω) among all samples. Long-term cycling confirmed 84.35% capacitance retention with 94.46% coulombic efficiency after 12,000 cycles. Furthermore, the asymmetric pouch-type supercapacitor (APSD) constructed with Nd/Gd–Co as the positive electrode and activated carbon as the negative electrode delivered a wide operational window of 1.5 V, an areal capacitance of 140 mF/cm2, an energy density of 0.044 mWh/cm2, and 89.44% retention after 7000 cycles. These findings establish Nd/Gd-Co gels as robust and scalable electrode materials and demonstrate that RE co-doping is an effective strategy for bridging high energy density with long-term electrochemical stability in asymmetric supercapacitors. Full article
(This article belongs to the Special Issue Gel-Based Materials for Energy Storage)
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