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

详细信息    查看全文

• 作者：Zhaohui Wang ; Daniel O. Carlsson ; Petter Tammela ; Kai Hua ; Peng Zhang ; Leif Nyholm ; Maria Str酶mme
• 刊名：ACS Nano
• 出版年：2015
• 出版时间：July 28, 2015
• 年：2015
• 卷：9
• 期：7
• 页码：7563-7571
• 全文大小：579K
• ISSN：1936-086X

文摘

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^鈥?) and volumetric (122 F cm^鈥?) capacitances at high current densities (300 mA cm^鈥? 鈮?33 A g^鈥?) until date reported for conducting polymer-based electrodes with active mass loadings as high as 9 mg cm^鈥?. 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^鈥? and 3 W cm^鈥? 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.