Liu L, Liu A, Xu Y, Yang F, Wang J, Deng Q, Zeng Z, Deng S. Fabrication of dual-hollow heterostructure of Ni
2CoS
4 sphere and nanotubes as advanced electrode for high-performance flexible
all-solid-state supercapacitors.
J Colloid Interface Sci 2020;
564:313-21. [PMID:
31918199 DOI:
10.1016/j.jcis.2019.12.074]
[Citation(s) in RCA: 11] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/02/2019] [Revised: 12/15/2019] [Accepted: 12/16/2019] [Indexed: 11/22/2022]
Abstract
High-energy-density and flexible supercapacitors have shown numerous application potential in modern portable electronics. However, the relatively low specific capacity, poor rate retentions, and limited durability have hindered their implement. Herein, a novel hierarchical dual-hollow electrode, composed of a hollow Ni2CoS4 sphere and outer hollow Ni2CoS4 nanotubes (Ni2CoS4HS-HTs), is elaborately constructed. The Ni2CoS4HS-HT-5 exhibits a high specific capacity of 817.5 C g-1 at a current density of 1 A g-1 with remarkable rate retention of 75.3% at 50 A g-1. In an all-solid-state asymmetric supercapacitor of Ni2CoS4HS-HT-5//CAC, a high capacitance of 1511.5 mF cm-2 at 5 mA cm-2 is obtained with an exceptional energy density of 13.6 mWh cm-3 at a power density of 92.6 mW cm-3. In addition, the capacity retention reaches 96% over 2000 cycles at 20 mA cm-3, implying the outstanding durability. The flexibility and mechanical stability are demonstrated by the intact electrochemical performances under different bending angles. As a proof-of-concept, two Ni2CoS4HS-HT-5//CACs in series could successfully illuminate 31 LED indicators for more than 8 mins. These fascinating electrochemical performances benefit from the novel electrode structure and depict great potential for modern energy storage applications.
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