Manganese dioxide decoration of macroscopic carbon nanotube fibers: From high-performance liquid-based to all-solid-state supercapacitors

JOURNAL OF POWER SOURCES

卷:372

Article

Pendashteh, Afshin¹  Senokos, Evgeny^1,2,3  Palma, Jesus¹  Anderson, Marc^1,4  Vilatela, Juan J.³  Marcilla, Rebeca¹ 

[1] IMDEA Energy Inst, Electrochem Proc Unit, Parque Tecnol Mostoles,Avda Ramon de la Sagra,3, Madrid 28935, Spain

[2] Univ Politecn Madrid, ETS Ingn Caminos, E-28040 Madrid, Spain

[3] Tecnogetafe, IMDEA Mat Inst, Calle Eric Kandel,2, Madrid 28906, Spain

[4] Univ Wisconsin, Dept Civil & Environm Engn, Madison, WI 53706 USA

关键词: Carbon nanotube fiber;    Manganese dioxide;    Ionic liquid;    Solid-state;    Supercapacitor;   

DOI  :  10.1016/j.jpowsour.2017.10.068

来源: Elsevier

【 摘 要 】

Supercapacitors capable of providing high voltage, energy and power density but yet light, low volume occupying, flexible and mechanically robust are highly interesting and demanded for portable applications. Herein, freestanding flexible hybrid electrodes based on MnO2 nanoparticles grown on macroscopic carbon nanotube fibers (CNTf-MnO2) were fabricated, without the need of any metallic current collector. The CNTf, a support with excellent electrical conductivity, mechanical stability, and appropriate pore structure, was homogeneously decorated with porous akhtenskite epsilon-MnO2 nanoparticles produced via electrodeposition in an optimized organic -aqueous mixture. Electrochemical properties of these decorated fibers were evaluated in different electrolytes including a neutral aqueous solution and a pure 1-butyl-3-methylpyrrolidinium bis(trifluoromethylsulfonyl)imide ionic liquid (PYR14TFSI). This comparison helps discriminate the various contributions to the total capacitance: (surface) Faradaic and non-Faradaic processes, improved wetting by aqueous electrolytes. Accordingly, symmetric supercapacitors with PYR14TESI led to a high specific energy of 36 Wh.kg(MnO2)(-1) (16 Wh.Kg(-1) including the weight of CNTf) and real specific power of 17 kW.kg(MnO2)(-1) (7.5 kW kg(-1)) at 3.0 V with excellent cycling stability. Moreover, flexible all solid-state supercapacitors were fabricated using PYR14TFSI-based polymer electrolyte, exhibiting maximum energy density of 21 Wh.Kg(-1) and maximum power density of 8 kW kg(-1) normalized by total active material.

【 授权许可】

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