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Practical Synthesis for N‐doped Carbon Microsphere Coated with Zn 0.76 Co 0.24 S Nanoparticles towards High‐performance Supercapacitors
Author(s) -
Zhang Wenjun,
Zhou Ting,
Hao Yonghao,
Wang Zhongbing,
Chen Chunnian
Publication year - 2021
Publication title -
chemistryselect
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.437
H-Index - 34
ISSN - 2365-6549
DOI - 10.1002/slct.202102152
Subject(s) - supercapacitor , materials science , capacitance , calcination , nanocomposite , nanoparticle , composite number , chemical engineering , carbon fibers , microsphere , nanotechnology , doping , electrochemistry , composite material , electrode , optoelectronics , chemistry , organic chemistry , engineering , catalysis
To meet the market demand for supercapacitors with large capacitance and high stability, we successfully prepared a new type of composit material of N−C@Zn 0.76 Co 0.24 S with a hierarchical structure utilizing solvothermal and calcination. The nanostructures and electrochemical properties of the samples were tested and analyzed. By adjusting the mass ratio of the N‐doped carbon microsphere during the process of synthesizing composite materials, a series of comparative materials were obtained. The result of research shows that, when the mass ratio of the N‐doped carbon microsphere in the composite was 55 %, the nanocomposite demonstrated excellent specific capacitance (2033.7 F g −1 at a current density of 1 A g −1 ) and strong cycle performance (retain 88.4 % after 5000 charge‐discharge cycles), far superior to that of the single metal sulfide coating on N‐doped carbon microsphere. When assembled into N−C@ZCS//AC asymmetric supercapacitor (ASC), the ASC exhibits a large energy density of 79.6 Wh kg −1 while the power density is 799.7 W kg −1 , proving the composite materials have positive significance in the application of supercapacitors.