Modified chalcogens with a tuned nano-architecture for high energy density and long life hybrid super capacitors. Issue 16 (5th April 2017)

• Record Type: Journal Article
• Authors: Abureden, Salah; Hassan, Fathy M.; Lui, Gregory; Sy, Serubbabel; Batmaz, Rasim; Ahn, Wook; Yu, Aiping; Chen, Zhongwei
• Is Part Of: Journal of materials chemistry. Volume 5:Issue 16(2017)
• Page Start: 7523
• Page End: 7532
• Publication Date: 2017-04-05
• Subjects: Materials -- Research -- Periodicals; Chemistry, Analytic -- Periodicals; Environmental sciences -- Research -- Periodicals; 543.0284
• DOI: 10.1039/c7ta00897j
• Languages: English
• ISSNs: 2050-7488

Abstract

Abstract : A novel in situ vanadium-modified NiCo2 S4 wrapped with graphene sheets was synthesized using a simple solvothermal technique. Abstract : A novel in situ vanadium-modified NiCo2 S4 wrapped with graphene sheets was synthesized using a simple solvothermal technique. The vanadium-modified sample (VNCS) demonstrated superior electrochemical performance over graphene-wrapped NiCo2 S4 (GNCS) and pure NiCo2 S4 (NCS) samples, with a specific capacitance of 1340 F g −1 at a current density of 2 A g −1 . The VNCS sample also showed outstanding capacitance retention at 50 A g −1 (1024 F g −1 ), which is 430% higher than that of the NCS sample. The cycling stability of VNCS was significantly improved by more than 140% compared to the NCS sample with less than 10 −3 F per cycle loss in capacitance after 10 000 cycles. We also report the fabrication of hybrid supercapacitors (HSCs) using three different materials for the faradaic electrode. The VNCS-HSCs showed significant improvements in all electrochemical performance measurements compared to NCS-HSCs. The capacitance retention at 50 A g −1 was improved by more than 260% and the long cycling stability was improved by more than 180% after 10 000 cycles. The VNCS-HSC delivered an energy density of 45.9 W h kg −1 at 0.87 kW kg −1 and maintained a superior energy density of 33.6 W h kg −1 at 9 kW kg −1 indicating the excellent potential of this material in hybrid super capacitor applications.