Growth of vertically aligned Co3S4/CoMo2S4 ultrathin nanosheets on reduced graphene oxide as a high-performance supercapacitor electrode. Issue 48 (23rd November 2016)

• Record Type: Journal Article
• Authors: Yang, Xijia; Sun, Haiming; Zan, Ping; Zhao, Lijun; Lian, Jianshe
• Is Part Of: Journal of materials chemistry. Volume 4:Issue 48(2016)
• Page Start: 18857
• Page End: 18867
• Publication Date: 2016-11-23
• Subjects: Materials -- Research -- Periodicals; Chemistry, Analytic -- Periodicals; Environmental sciences -- Research -- Periodicals; 543.0284
• DOI: 10.1039/c6ta07898b
• Languages: English
• ISSNs: 2050-7488

Abstract

Abstract : Ultrathin Co3 S4 /CoMo2 S4 nanosheets vertically aligned on rGO sheets are prepared through a facile one-step hydrothermal method for supercapacitors. Abstract : Vertically aligned Co3 S4 /CoMo2 S4 (CMS) ultrathin nanosheets on reduced graphene oxide (rGO) are first prepared through a facile one-step hydrothermal method. Interestingly, Co3 S4 exhibits good matching on the CoMo2 S4 surface with semicoherent interfaces, facilitating charge transfer at the abundant CMS interfaces and guaranteeing more stable structures. Meanwhile, nanoscaled CMS sheets with ideal thicknesses of about 3–5 nm are uniformly dispersed on rGO, helping to increase the contact area with the electrolyte. These characteristics accelerate the ion transportation efficiency, and also improve the electrochemical utilization. Therefore, the hybrid shows a nice capacitance of 1457.8 F g −1 at 1 A g −1, and possesses good stability with 97% of the initial capacitance retained after 2000 cycles. Furthermore, an asymmetric supercapacitor device fabricated by using CMS–rGO as the positive electrode and activated carbon (AC) as the negative electrode presents a high energy density of 33.1 W h kg −1 at a power density of 0.85 kW kg −1 with excellent cycle stability (93.8%) even after 5000 cycles, highlighting its promising applications as an efficient electrode material for supercapacitors.