Journal
ACS APPLIED NANO MATERIALS
Volume 4, Issue 5, Pages 5553-5563Publisher
AMER CHEMICAL SOC
DOI: 10.1021/acsanm.1c01036
Keywords
free-standing graphene; polyaniline; iron oxide; binder-free electrode; all-solid capacitor
Funding
- National Council for Scientific and Technological Development (CNPq-Brasil)
- CNPq [423918/2018-4, 403544/2016-5]
- Coordination of Superior Level Staff Improvement (CAPES)
- FAPESP [2017/21988-5]
- CAPES-PRInt [88887.310281/2018-00]
- National Institute of Science and Technology (INCT) in Carbon Nanomaterials
- Brazilian agency Fapemig
- Brazilian agency CAPES
- Brazilian agency CNPq
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This work presents the preparation of ternary composites of reduced graphene oxide/polyaniline/iron oxide as free-standing and flexible thin films using a simple doctor blade technique. By adding polyaniline, the composites were able to produce free-standing films without the need for binders or conductive additives, while also improving energy storage performance. The ternary free-standing film exhibited high specific capacitance and long-term stability, showing potential for large-scale application in energy storage systems.
This work states the preparation of ternary composites of reduced graphene oxide/polyaniline/iron oxide as free-standing and flexible thin films using a simple doctor blade technique. We optimized the properties of the films for further studies as an electrode in a symmetric all-solid supercapacitor. Adding polyaniline into the composites is imperative to produce free-standing films with no binder and conductive additive, besides improving the energy storage performance along with iron oxide. The ternary free-standing film exhibited a specific capacitance of 281 F g(-1) in the three-electrode system and a specific capacitance of 24 F g(-1) in the all-solid supercapacitor, including a good long-term stability of 76% and excellent Coulombic efficiency ranging from 92 to 166% after 3000 cycles at 3 A g(-1). The performance of these free-standing ternary composites prepared using the same method applied in commercial supercapacitors may offer a perspective to its large-scale application in energy storage systems.
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