Enhanced performance of HRGO-RuO₂ solid state flexible supercapacitors fabricated by electrophoretic deposition

Journal Article · Tue Jun 07 00:00:00 EDT 2016 · Carbon

DOI:https://doi.org/10.1016/j.carbon.2016.06.013· OSTI ID:1341682

Amir, Fatima Z. ^[1]; Pham, V. H. ^[2]; Mullinax, D. W. ^[1]; Dickerson, J. H. ^[2]

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1. Winthrop Univ., Rock Hill, SC (United States). Dept. of Chemistry, Physics and Geology
2. Brookhaven National Lab. (BNL), Upton, NY (United States). Center for Functional Nanomaterials (CFN)

Ruthenium oxide (RuO₂) nanomaterials exist as excellent materials for electrochemical capacitors. However, they tend to suffer from low mechanical flexibility when cast into films, which makes them unsuitable for flexible device applications. Herein, we report an environmentally friendly and solution-processable approach to fabricate RuO₂-based composite electrodes for flexible solid state supercapacitors. The composites were produced by anchoring RuO₂ nanoparticles onto holey reduced graphene oxide (HRGO) via a sol-gel method, followed by the electrophoretic deposition (EPD) of the material into thin films. The uniform anchoring of ultra-small RuO₂ nanoparticles on the two-dimensional HRGO sheets resulted in HRGO-RuO₂ hybrid sheets with excellent mechanical flexibility of HRGO. EPD induced a layer-by-layer assembly mechanism for the HRGO-RuO₂ hybrid sheets, which resulted in a binder-free, flexible electrode. The obtained HRGO-RuO₂ flexible supercapacitors exhibited excellent electrochemical capacitive performance in a PVA-H₂SO₄ gel electrolyte with a specific capacitance of 418 F g^-1 and superior cycling stability of 88.5% capacitance retention after 10,000 cycles. Additionally, these supercapacitors exhibited high rate performance with capacitance retention of 85% by increasing the current density from 1.0 to 20.0 Ag^-1, and excellent mechanical flexibility with only 4.9% decay in the performance when bent 180°.

• Research Organization: Brookhaven National Lab. (BNL), Upton, NY (United States). Center for Functional Nanomaterials (CFN)
• Sponsoring Organization: USDOE Office of Science (SC), Basic Energy Sciences (BES)
• Grant/Contract Number: SC0012704
• OSTI ID: 1341682
• Alternate ID(s): OSTI ID: 1358878
• Report Number(s): BNL-113411-2017-JA; KC0403020
• Journal Information: Carbon, Vol. 107; ISSN 0008-6223
• Publisher: Elsevier
• Country of Publication: United States
• Language: English

Related Subjects

77 NANOSCIENCE AND NANOTECHNOLOGY
supercapacitors
ruthenium oxide
reduced graphene oxide
Center for Functional Nanomaterials