Surface Modified Nanocellulose Fibers Yield Conducting Polymer-Based Flexible Supercapacitors with Enhanced Capacitances

We demonstrate that surface modified nanocellulose fibers (NCFs) can be used as substrates to synthesize supercapacitor electrodes with the highest full electrode-normalized gravimetric (127 F g–1) and volumetric (122 F cm–3) capacitances at high current densities (300 mA cm–2 ≈ 33 A g–1) until date...

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Vydáno v:ACS nano Ročník 9; číslo 7; s. 7563 - 7571
Hlavní autoři: Wang, Zhaohui, Carlsson, Daniel O, Tammela, Petter, Hua, Kai, Zhang, Peng, Nyholm, Leif, Strømme, Maria
Médium: Journal Article
Jazyk:angličtina
Vydáno: United States American Chemical Society 28.07.2015
Témata:
capacitance
Conducting polymers
Density
Devices
Electrodes
energy storage devices
Engineering Science with specialization in Nanotechnology and Functional Materials
Fibers
modified nanocellulose
Nanostructure
Polymerization
porosity optimization
Surface chemistry
Teknisk fysik med inriktning mot nanoteknologi och funktionella material
porosity optimization
energy storage devices
capacitance
conducting polymers
modified nanocellulose
ISSN:1936-0851, 1936-086X, 1936-086X
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Shrnutí:We demonstrate that surface modified nanocellulose fibers (NCFs) can be used as substrates to synthesize supercapacitor electrodes with the highest full electrode-normalized gravimetric (127 F g–1) and volumetric (122 F cm–3) capacitances at high current densities (300 mA cm–2 ≈ 33 A g–1) until date reported for conducting polymer-based electrodes with active mass loadings as high as 9 mg cm–2. By introducing quaternary amine groups on the surface of NCFs prior to polypyrrole (PPy) polymerization, the macropore volume of the formed PPy-NCF composites can be minimized while maintaining the volume of the micro- and mesopores at the same level as when unmodified or carboxylate groups functionalized NCFs are employed as polymerization substrates. Symmetric, aqueous electrolyte-based, devices comprising these porosity-optimized electrodes exhibit device-specific volumetric energy and power densities of 3.1 mWh cm–3 and 3 W cm–3 respectively; which are among the highest values reported for conducting polymer electrodes in aqueous electrolytes. The functionality of the devices is verified by powering a red light-emitting diode with the device in different mechanically challenging states.
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ISSN:1936-0851
1936-086X
1936-086X
DOI:10.1021/acsnano.5b02846