High-Energy Flexible Supercapacitor—Synergistic Effects of Polyhydroquinone and RuO₂·xH₂O with Microsized, Few-Layered, Self-Supportive Exfoliated-Graphite Sheets

Title data

Muniraj, Vedi Kuyil Azhagan ; Dwivedi, Pravin Kumari ; Tamhane, Parikshit ; Szunerits, Sabine ; Boukherroub, Rabah ; Shelke, Manjusha Vilas:
High-Energy Flexible Supercapacitor—Synergistic Effects of Polyhydroquinone and RuO₂·xH₂O with Microsized, Few-Layered, Self-Supportive Exfoliated-Graphite Sheets.
In: ACS Applied Materials & Interfaces. Vol. 11 (2019) Issue 20 . - pp. 18349-18360.
ISSN 1944-8252
DOI: https://doi.org/10.1021/acsami.9b01712

Official URL:

Abstract in another language

An effective and straightforward route for tailoring the self-supporting, exfoliated flexible graphite substrate (E-FGS) using electrochemical anodization is proposed. E-FGS has essential features of highly exfoliated, few-layered, two-dimensional graphite sheets with the size of several tens of micrometers, interconnected along the axis of the substrate surface. The novel hierarchical porous structural morphology of E-FGS enables large active sites for efficient electrolyte ion and charge transport when used as electrode material for a supercapacitor. In order to effectively utilize this promising E-FGS electrode for energy storage purpose, a ternary composite is further synthesized with pseudocapacitive polyhydroquinone (PHQ) and hydrous RuO2 (hRO). hRO is synthesized via a sol–gel route, while electropolymerization is utilized for the electrodeposition of PHQ over E-FGS. Ultimately, the fabricated self-supporting E-FGS-based flexible supercapacitor is capable of delivering areal specific capacitance values as high as 378 mF cm–2 at a current density of 1 mA cm–2. Addition of the pseudocapacitive component to the E-FGS texture leads to ∼10 times increase of the electrochemical charge storage capability. The imposition of mechanical forces to this flexible supercapacitor device results in trivial changes in electrochemical properties and is still capable of retaining 91% of the initial specific capacitance after 10 000 cycles. Alongside, the fabricated symmetrical solid-state flexible device exhibited a high energy density of 8.4 μWh cm–2. The excellent performance along with the ease of synthesis and fabrication process of the flexible solid-state supercapacitor device using PHQ/hRO/E-FGS holds promise for large-scale production.

Further data

Item Type:	Article in a journal
Refereed:	No
Keywords:	graphite exfoliation; ruthenium oxide; polyhydroquinone; ternary composite; solid-state flexible supercapacitor
Institutions of the University:	Faculties > Faculty of Engineering Science > Chair Metals and Alloys
Result of work at the UBT:	No
DDC Subjects:	500 Science > 540 Chemistry 600 Technology, medicine, applied sciences > 620 Engineering
Date Deposited:	15 Jul 2024 08:46
Last Modified:	15 Jul 2024 11:02
URI:	https://eref.uni-bayreuth.de/id/eprint/89937