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

Autor(es)

Khalid, Mohd ^[1] ; Hassan, Ayaz ^[1] ; Honorato, Ana M. B. ^[2] ; Crespilho, Frank N. ^[1] ; Varela, Hamilton ^[1]

Afiliação do(s) autor(es)

^[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

• Tipo de documento: Artigo Científico
• Fonte: JOURNAL OF ELECTROANALYTICAL CHEMISTRY; v. 847, AUG 15 2019.
• Citações Web of Science: 0

Resumo

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)

• Processo FAPESP: 13/14262-7 - Filmes nanoestruturados de materiais de interesse biológico
• Beneficiário: Osvaldo Novais de Oliveira Junior
• Modalidade de apoio: Auxílio à Pesquisa - Temático
• Processo FAPESP: 15/16672-3 - Desenvolvimento de Bioeletrodos de Alto Desempenho para Miniaturização de Biocélulas a Combustível
• Beneficiário: Frank Nelson Crespilho
• Modalidade de apoio: Auxílio à Pesquisa - Regular
• Processo FAPESP: 13/16930-7 - Eletrocatálise V: processos eletrocatalíticos de interconversão entre as energias química e elétrica
• Beneficiário: Edson Antonio Ticianelli
• Modalidade de apoio: Auxílio à Pesquisa - Temático
• Processo FAPESP: 16/25806-6 - Interação entre biomoléculas e nanoestruturas: eletroquímica, interfaces e superfícies
• Beneficiário: Ayaz Hassan
• Modalidade de apoio: Bolsas no Brasil - Pós-Doutorado
• Processo FAPESP: 17/00433-5 - Desenho e síntese de electrocatalisador multifuncional sem metais em fios de fibra de carbono para redução de oxigênio e reações de desprendimento de oxigênio e hidrogênio
• Beneficiário: Mohmmad Khalid
• Modalidade de apoio: Bolsas no Brasil - Pós-Doutorado