4.7 Article

Hierarchically urchin-like hollow NiCo2S4 prepared by a facile template-free method for high-performance supercapacitors

Journal

JOURNAL OF COLLOID AND INTERFACE SCIENCE
Volume 604, Issue -, Pages 292-300

Publisher

ACADEMIC PRESS INC ELSEVIER SCIENCE
DOI: 10.1016/j.jcis.2021.06.144

Keywords

NiCo2S4; Urchin-like hollow structure; Asymmetric supercapacitor

Funding

  1. Xi'an Key Laboratory of Green Manufacture of Ceramic Materials Foundation [2019220214SYS017CG039]
  2. youth talent support program of Shaanxi University of Science and Technology [2016QNBJ-08]
  3. National Natural Science Foundation of China [51402181]

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A facile template-free method was reported for the preparation of novel urchin-like hollow nickel cobalt sulfide, which significantly improved specific capacitance and accommodated structural collapse caused by electrochemical reactions. The resulting hollow spheres demonstrated impressive capacitance and cycling stability, making progress on efficient supercapacitors.
Hollow structures draw much attention for high energy density supercapacitors due to their large hollow cavities, high specific surface area, and low interfacial contact resistance. However, constructing hierarchical hollow structures remains a challenge. Herein, we reported a facile template-free method for a novel urchin-like hollow nickel cobalt sulfide (NiCo2S4). The hollow interior and urchin exterior remarkably improved the specific capacitance and accommodated structural collapse caused by electrochemical reactions. Owing to these features, the urchin-like hollow NiCo2S4 spheres exhibited an impressive capacitance of 1398F g(-1) at 1 A g(-1) and maintained 1110F g(-1) with a large current density of 10 A g(-1). The hybrid supercapacitor fabricated by NiCo2S4 and active carbon possesses an energy density of 39.3 Wh kg(-1) at a power density of 749.6 W kg(-1) and an outstanding cycling stability of 74.4% retention after 5000 cycles. Our work presents a facile method of constructing a hollow structure of binary sulfide materials and also makes progress on highly efficient supercapacitors. (C) 2021 Elsevier Inc. All rights reserved.

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