Optimized redox activity and synergistic structural design of CoFe-LDH@cobalt carbonate hydroxide hydrate hybrid electrodes for high-performance solid-state supercapacitor devices

Third Author's Department

Energy Materials Laboratory

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https://doi.org/10.1016/j.est.2025.117406

All Authors

Aya M. Mohamed Heba M. El Sharkawy Nageh K. Allam

Document Type

Research Article

Publication Title

Journal of Energy Storage

Publication Date

9-1-2025

doi

10.1016/j.est.2025.117406

Abstract

Designing high-performance electrodes for supercapacitors remains a formidable challenge in advancing energy storage technologies. Layered double hydroxides (LDHs) have emerged as exceptional candidates due to their unique layered structures and the synergistic interplay of binary transition metal compositions with intercalated CO₃2− anions. To further elevate capacitive performance, LDHs can be strategically heterostructured with complementary active materials, such as cobalt carbonate hydroxide hydrate (CCHH). This approach markedly enhances electrolyte transport dynamics and maximizes active site accessibility, thereby accelerating charge transfer and significantly boosting specific capacitance. The FeCo-LDH@CCHH hybrid, distinguished by its mixed nanowire and nanosheet morphology, exhibits outstanding electrochemical properties, delivering an impressive areal capacitance of 9296 mF cm−2 at a galvanostatic charge-discharge (GCD) current density of 5 mA cm−2. When integrated as the positrode in an asymmetric all-solid-state supercapacitor (ASC) (FeCo-LDH@CCHH//AC), the device achieves a remarkable specific energy of 118.86 μWh cm−2 at a specific power of 3965.77 μW cm−2, while maintaining exceptional efficiency and long-term stability. This study presents an optimized strategy for significantly enhancing the electrochemical performance of transition metal-based LDHs, paving the way for their seamless integration into next-generation energy storage systems.

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