MnCo2S4 nanoparticles anchored to N- and S-codoped 3D graphene as a prominent electrode for asymmetric supercapacitors. (May 2019)

• Record Type: Journal Article
• Authors: Wang, Hongfei; Zhang, Kefu; Song, Yuqing; Qiu, Jun; Wu, Juan; Yan, Lifeng
• Is Part Of: Carbon. Volume 146(2019)
• Page Start: 420
• Page End: 429
• Publication Date: 2019-05
• Subjects: Asymmetric supercapacitors -- MnCo2S4 -- Graphene -- 3D architecture -- Composite; Carbon -- Periodicals; Carbone -- Périodiques; Koolstof; Toepassingen; Electronic journals; 546.681
• DOI: 10.1016/j.carbon.2019.02.035
• Languages: English
• ISSNs: 0008-6223

Abstract

Abstract: Binary composites MnCo2 S4 nanoparticles are potential and attractive materials for supercapacitors. Here, we synthesis the MnCo2 S4 nanoparticles anchored on both N and S co-doped 3D graphene composites via a facile two-step controlled sulfurization route. Thiourea contents shows strong effect on the nanostructures and electrochemical properties of the 3D composites. When adjusting the molar ratio of thiourea to Mn 2+ as 48:1, the optimal composite electrode achieves a largest specific capacitance of 1324.3 F g −1 at 1 A g −1, with high conductivity, excellent rate performance and outstanding cyclic stability due to its unique structural advantages. Moreover, we fabricate an asymmetric supercapacitor with an operating voltage of 1.5 V using the composite and N, S co-doped graphene nanosheets as both electrodes and it delivers a high energy density of 62.9 Wh kg −1 at a power density of 0.74 kW kg −1, and 28.0 Wh kg −1 at a power density of 1.80 kW kg −1, which are higher than those of reported similar devices. These results prove that the design and optimization of MnCo2 S4 and graphene composites is a method to achieve high performance supercapacitors. Graphical abstract: Image 1