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(Reference retrieved automatically from Web of Science through information on FAPESP grant and its corresponding number as mentioned in the publication by the authors.)

8-Hydroxyquinoline-5-sulfonic acid on reduced graphene oxide layers as a metal-free electrode material for supercapacitor applications

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Khalid, Mohd [1] ; Hassan, Ayaz [1] ; Honorato, Ana M. B. [2] ; Crespilho, Frank N. [1] ; Varela, Hamilton [1]
Total Authors: 5
[1] Univ Sao Paulo, Inst Chem Sao Carlos, POB 780, BR-13560970 Sao Carlos, SP - Brazil
[2] Case Western Reserve Univ, Dept Macromol Sci & Engn, Ctr Adv Sci & Engn Carbon Case4carbon, 10900 Euclid Ave, Cleveland, OH 44106 - USA
Total Affiliations: 2
Document type: Journal article
Web of Science Citations: 0

Quinone organic materials are promising candidates to construct supercapacitor electrodes as they are entirely nontoxic, nonflammable, and safe for use. However, their wide adoption in supercapacitor applications is restricted by the inadequate electrical conductivity, which results in low mass and electron transfer, thereby leading to poor electrochemical performance. Herein, redox active 8-hydroxyquinoline-5-sulfonic acid (HQSA) compositing with reduced graphene oxide (rGO) through wet-chemistry method, as a high-performance electrode material is reported. Non-covalently interacted HQSA with rGO results in low internal resistance and high reversibility of the redox reaction. The as-prepared metal- and binder-free electrode in three-electrode cell configuration exhibits the specific capacity of 220C/g (61.1 mA h/g), demonstrating a 208% increase in capacity than bare rGO (105.5C/g or 29.3 mA h/g) at the same specific current of 0.5 A/g in 1 M H2SO4 electrolyte solution. This electrode material shows an excellent cyclic stability with 99% capacity retention after 10,000 consecutive voltammetry cycles at 100 mV/s. Furthermore, a symmetrical two electrode cell was constructed, which endows maximum cell capacity of 45C/g (12.5 mA h/g) that is equivalent to a specific energy of 6.25 W h/kg and a specific power of 522 W/kg. This work not only provides a promising electrode for super capacitor but more importantly demonstrates a unique strategy to design active and durable material for future energy storage technologies. (AU)

FAPESP's process: 13/14262-7 - Nanostructured films from biologically-relevant materials
Grantee:Osvaldo Novais de Oliveira Junior
Support type: Research Projects - Thematic Grants
FAPESP's process: 15/16672-3 - Development of high performance bioelectrodes for application in miniaturized biofuel cell
Grantee:Frank Nelson Crespilho
Support type: Regular Research Grants
FAPESP's process: 13/16930-7 - Electrocatalysis V: electrocatalytic processes of chemical and electrical energy interconversion
Grantee:Edson Antonio Ticianelli
Support type: Research Projects - Thematic Grants
FAPESP's process: 16/25806-6 - Interaction between biomolecules and nanostructures: electrochemistry, interfaces and surfaces
Grantee:Ayaz Hassan
Support type: Scholarships in Brazil - Post-Doctorate
FAPESP's process: 17/00433-5 - Design and synthesis of multifunctional metal-free electrocatalyst onto carbon fiber yarns for oxygen reduction, and oxygen and hydrogen evolution reactions
Grantee:Mohmmad Khalid
Support type: Scholarships in Brazil - Post-Doctorate