Self-assembled 3D graphene-based aerogel with Au nanoparticles as high-performance supercapacitor electrode

Sahoo, BB and Kumar, N and Panda, HS and Panigrahy, B and Sahoo, NK and Soam, A and Mahanto, BS and Sahoo, PK (2021) Self-assembled 3D graphene-based aerogel with Au nanoparticles as high-performance supercapacitor electrode. In: Journal of Energy Storage, 43 .

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Abstract

Construction of porous three-dimensional (3D) heterostructured materials is promising for establishing high-performance energy-storage devices, enabling large surface area, facilitated ion and electron transport, and synergistic effects between multi-components. Here, we report a simple and cost-efficient freeze-casting method to improve the electrochemical performance of porous 3D graphene aerogel (GA) embedded with gold nanoparticles (3D Au/GA). The as-synthesized 3D Au/GA was broadly characterized by XRD, Raman, XPS, SEM, and TEM. Morphology observations show that 3D-porous cellular structure of GA with uniform distribution of 20 nm Au nanoparticles on the surface of GA. Based on structural merits, the electrochemical performance of as-synthesized porous 3D Au/GA was exemplified as electrode materials for supercapacitor with a high specific capacitance of 554 F g�1 at 5 mVs�1, excellent cycling stability with capacitance retention of 91.06 after 10,000 cycles, and exhibits significantly specific energy of 10.7 W h kg�1 at a specific power of 203.5 W kg�1. This could be ascribed to the synergetic effect of conducting Au and the unique 3D porous, cellular structure of GA. In addition, the developed electrode materials are used to fabricate a symmetric solid-state supercapacitor (SSC) device for demonstrating the practical applicability, and it was able to light a commercial LED. Our method opened a new direction to synthesize porous 3D GA with various nanoparticle decorations for numerous applications as energy storage devices, catalysis, sensors, biomedical, and environmental applications. © 2021 Elsevier Ltd

Item Type:	Journal Article
Publication:	Journal of Energy Storage
Publisher:	Elsevier Ltd
Additional Information:	The copyright for this article belongs to Elsevier Ltd.
Keywords:	Aerogels; Capacitance; Cellular automata; Electrochemical electrodes; Electron transport properties; Energy storage; Fiber optic sensors; Gold nanoparticles; Metal nanoparticles; Morphology; Supercapacitor; Synthesis (chemical), 3D graphene; 3d-porous structure; Au nanoparticle; Electrochemical performance; Electrode material; Graphene aerogels; Performance; Porous structures; State supercapacitor device; Synthesised, Graphene
Department/Centre:	Division of Chemical Sciences > Solid State & Structural Chemistry Unit
Date Deposited:	06 Jan 2022 04:50
Last Modified:	06 Jan 2022 04:50
URI:	http://eprints.iisc.ac.in/id/eprint/70836

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