Electrochemical self-assembled core/shell PEDOT@MoS2 composite with ultra-high areal capacitance for supercapacitor

• Published in: Electrochimica acta 2021-02, Vol.370, p.137791, Article 137791
• Main Authors: Cai, Yue, Xu, Liming, Kang, Huan, Zhou, Weiqiang, Xu, Jingkun, Duan, Xuemin, Lu, Xinyu, Xu, Quan
• Format: Article
• Language: English
• Subjects: Capacitance; Core-shell structure; Electrochemical co-deposition; Energy storage; Flux density; Heterostructures; Hierarchical core/shell structures; Molybdenum disulfide; PEDOT@MoS2; Self-assembly; Structural hierarchy; Supercapacitors
• ISSN: 0013-4686; 1873-3859
• DOI: 10.1016/j.electacta.2021.137791

An active material electrode with high areal specific capacitance is needed for a high-performance supercapacitor, but it is difficult to achieve this goal for PEDOT-based composites. Here, a novel hierarchical core/shell PEDOT@MoS2 composite was assembled by the electrochemical co-deposition of EDOT and MoS2 submicron spheres. The SEM, TEM images of the as-obtained composite explicitly reveal the core/shell heterostructure of PEDOT@MoS2 with a diameter of about 800 nm. The electrochemical characterizations show that the optimized PEDOT@MoS2 composite possesses a high specific capacitance of 2540 mF cm−2 at 1 mA cm−2 and excellent capacitance retention of 98.5% after 5000 cycles at a high current density of 100 mA cm−2. The assembled P@M-4//PEDOT asymmetric supercapacitor shows a high energy density of 937 Wh m−2 at 6500 W m−2, and outstanding cycling stability with capacitance retention of 100% after 5000 cycles. It is proposed that the enhanced performances are attributed to the robust hierarchical core/shell structures and the synergic effect between PEDOT and MoS2, which is expected to become a promising candidate for applications in high-performance supercapacitors. [Display omitted]