Densely Functionalized Cyanographene Bypasses Aqueous Electrolytes and Synthetic Limitations Toward Seamless Graphene/β‐FeOOH Hybrids for Supercapacitors

Densely Functionalized Cyanographene Bypasses Aqueous Electrolytes and Synthetic Limitations Toward Seamless Graphene/β‐FeOOH Hybrids for Supercapacitors

Supercapacitors are a promising energy storage technology owing to their unparalleled power and lifetime. However, to meet the continuously rising demands of energy storage, they must be equipped with higher energy densities. For this purpose, the seamless integration of metal oxides on carbon matri...

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Bibliographic Details
Published in:Advanced functional materials Vol. 29; no. 51
Main Authors: Talande, Smita V., Bakandritsos, Aristides, Jakubec, Petr, Malina, Ondřej, Zbořil, Radek, Tuček, Jiři
Format: Journal Article
Language:English
Published: Hoboken Wiley Subscription Services, Inc 01-12-2019
Subjects:
Accumulators
Aqueous electrolytes
Collectors
Corrosion resistance
Electrode materials
Electrolytes
Energy
Energy storage
functionalized graphene
Graphene
Iron oxides
iron oxyhydroxide
Materials science
Nanoparticles
Nonaqueous electrolytes
Organic chemistry
organic electrolytes
Oxides
Supercapacitors
Wettability
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Summary:Supercapacitors are a promising energy storage technology owing to their unparalleled power and lifetime. However, to meet the continuously rising demands of energy storage, they must be equipped with higher energy densities. For this purpose, the seamless integration of metal oxides on carbon matrices, such as iron oxides/oxyhydroxides, has been pursued through hydrothermal, atomic layer and electro‐deposition methods directly on current collectors. Nevertheless, such methods present limited compatibility with commercial paste‐coating processes on the current collectors. Furthermore, iron oxides/oxyhydroxides lack conductivity and are hydrophilic, operating with low‐voltage aqueous electrolytes, limiting their power and energy and requiring corrosion‐resistant H2O current collectors. To mitigate these challenges, a seamless and paste‐ready material is successfully developed through a 15 min wet‐chemical method, via the coordination of ultrasmall β‐FeOOH (akaganéite) nanoparticles to the nitrile groups of a covalent graphene derivative. Endowed with graphene‐like impedance response and very high wettability in organic electrolytes, combined high power and energy densities are obtained, with respect to the total mass of both electrode materials and current collectors, overcoming the identified challenges. This offers future prospects for the exploration of alternative molecular handles for improved interfaces and their application in different energy‐storage chemistries. Cyanographene (G‐CN), a densely functionalized but conductive graphene derivative, bypasses the need for aqueous electrolytes and for high areal‐mass current collectors, and also overcomes previous synthetic limitations toward seamless organic/inorganic hybrids for supercapacitors. A device with high energy density at high power is attained using a paste‐ready and upscalable G‐CN/β‐FeOOH conductive hybrid.
ISSN:1616-301X
1616-3028
DOI:10.1002/adfm.201906998