Abstract
Nanocellulose has become one of the most attractive matrix materials for flexible supercapacitors, owing to the high surface area, good mechanical properties and environmental friendliness. Herein, we developed electrode materials with high capacitance and mechanical flexibility through the in-situ synthesis of polypyrrole (PPy) in TEMPO-oxidized cellulose nanofibril (TOCN)/sulfonated carbon nanotubes (SCNT) composite hydrogels. The TOCN/SCNT/PPy composite hydrogels were thus obtained via a bifunctional Fe3+ in-situ oxidation, showing high specific capacitance of 5299 mF/cm2 at a current density of 1 mA/cm2. Furthermore, the assembled symmetric TOCN-40SCNT-PPy solid-state supercapacitor exhibited outstanding capacitance of 375 mF/cm2 and electrochemical stability with 163.2 % capacitance retention at a current density of 1 mA/cm2 for 2500 cycles. These nanocellulose/carbon nanotube/polypyrrole hydrogels are thus promising in the fields of flexible solid-state supercapacitor with superior electrochemical performance.
Highlights
As a new type of energy storage device, supercapacitors have received extensive attention due to their unique power density and energy storage density characteristics differing from traditional storage devices
The TEMPO-oxidized cellulose nanofibril (TOCN)/sulfonated carbon nanotubes (SCNT)/PPy aerogels exhibited two characteristic bands at 1613 and 1034 cm-1, which belong to the -COO- group of TOCN and S-O stretching vibration peak of the aromatic sulfonic acid of SCNT, respectively
SCNT powder shows two diffraction peak at 26° and 44° owing to (002) and (100) crystal planes of carbon nanotubes. It reveals that the natural cellulose crystal structure of TOCN was preserved in the process of TEMPO oxidation and SCNT could maintain the crystal structure of carbon nanotubes well
Summary
As a new type of energy storage device, supercapacitors have received extensive attention due to their unique power density and energy storage density characteristics differing from traditional storage devices. We developed electrode materials with high capacitance and mechanical flexibility through the in-situ synthesis of polypyrrole (PPy) in TEMPO-oxidized cellulose nanofibril (TOCN)/sulfonated carbon nanotubes (SCNT) composite hydrogels. The TOCN/SCNT/PPy composite hydrogels were obtained via a bifunctional Fe3+ in-situ oxidation, showing high specific capacitance of 5299 mF/cm[2] at a current density of 1 mA/cm[2].
Sign-in/Register to view highlights & summary Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have
Schedule a callDisclaimer: All third-party content on this website/platform is and will remain the property of their respective owners and is provided on "as is" basis without any warranties, express or implied. Use of third-party content does not indicate any affiliation, sponsorship with or endorsement by them. Any references to third-party content is to identify the corresponding services and shall be considered fair use under The CopyrightLaw.
