Microporous 3D Graphene‐Like Carbon as Iodine Host for Zinc‐Based Battery–Supercapacitor Hybrid Energy Storage with Ultrahigh Energy and Power Densities

• Published in: Advanced energy and sustainability research Vol. 2; no. 10
• Main Authors: Park, Hongjun, Bera, Raj Kumar, Ryoo, Ryong
• Format: Journal Article
• Language: English
• Published: Argonne John Wiley & Sons, Inc 01.10.2021; Wiley-VCH
• Subjects: 3D graphene-like carbons; Activated carbon; Adsorption; battery–supercapacitor hybrids; Carbon; Electrodes; Electrolytes; Electron transfer; energy densities; Energy storage; Fabrication; Graphene; Iodine; iodine hosts; Oxidation; Performance evaluation; Pore size; power densities; Power management; Supercapacitors; Zeolites; Zinc; zinc–iodine batteries
• ISSN: 2699-9412; 2699-9412
• DOI: 10.1002/aesr.202100076

Zinc (Zn)‐based aqueous battery‐supercapacitor hybrid (BSH) devices are considered promising energy storage devices benefiting from their high energy and power densities, low‐cost, safety, and environmental benignity. However, challenges remain in the development of efficient BSH electrodes due to poor reversibility in battery electrodes and lack of efficient supercapacitor electrodes to solve the problems of low power and energy densities. Herein, the loading of iodine (I2) in the nanopores of 3D graphene‐like carbon (3DGC) for the fabrication of BSH electrodes and their device application with Zn are reported. The uniform micropores of 3DGC serve as nanocages to stabilize I2, the high surface area of 3DGC maximizes the dispersion, and the high conductivity of 3DGC provides a path for fast electron transfer. The resultant I2‐loaded 3DGC (I2/3DGC) is applied to evaluate Zn‐based battery and BSH performance. The I2/3DGC‐based electrode exhibits excellent performance with ultrahigh energy and power densities resulting from the high reversibility of I2 and supercapacitance of 3DGC. The device exhibits high cyclic stability in both battery and supercapacitor modes due to the confinement of I2 in the micropores. It is demonstrated that this combination of 3DGC with I2 provides an easy way to fabricate durable and economical BSH electrodes. A high‐performance battery–supercapacitor hybrid (BSH) electrode composed of iodine as the battery material and microporous 3D graphene‐like carbon as the supercapacitor material is developed for a Zn‐based BSH device. The BSH device indeed exhibits high energy and power densities in battery and supercapacitor modes, respectively.