NiCo2S4 Nanotrees Directly Grown on the Nickel NP-Doped Reduced Graphene Oxides for Efficient Supercapacitors

Wooree Jang; Won San Choi; Youn-Sik Lee; Hye Young Koo

doi:10.3390/ma12182865

NiCo₂S₄ Nanotrees Directly Grown on the Nickel NP-Doped Reduced Graphene Oxides for Efficient Supercapacitors

Materials (Basel). 2019 Sep 5;12(18):2865. doi: 10.3390/ma12182865.

Authors

Wooree Jang¹, Won San Choi², Youn-Sik Lee³, Hye Young Koo⁴

Affiliations

¹ Functional Composite Materials Research Center, Korea Institute of Science and Technology (KIST), Jeonbuk Institute of Advanced Composite Materials, 92 Chudong-ro, Bongdong-eup, Wanju-gun, Jeollabuk-do 55324, Korea.
² Department of Chemical and Biological Engineering, Hanbat National University, Daejeon 305-719, Korea.
³ School of Chemical Engineering, Chonbuk National University, Jeon-ju, Jeollabuk-do 54896, Korea. yosklear@jbnu.ac.kr.
⁴ Functional Composite Materials Research Center, Korea Institute of Science and Technology (KIST), Jeonbuk Institute of Advanced Composite Materials, 92 Chudong-ro, Bongdong-eup, Wanju-gun, Jeollabuk-do 55324, Korea. koohy@kist.re.kr.

Abstract

In this work, we report a feasible fabrication of NiCo₂S₄ nanotree-like structures grown from the Ni nanoparticle (NP)-doped reduced graphene oxides (Ni-rGO) by a simple hydrothermal method. It is found that the presence of Ni NPs on the surface of the rGOs initiates growth of the NiCo₂S₄ nanotree flocks with enhanced interfacial compatibility, providing excellent cyclic stability and rate performance. The resulting NiCo₂S₄/Ni-rGO nanocomposites exhibit a superior rate performance, demonstrating 91.6% capacity retention even after 10,000 cycles of charge/discharge tests.

Keywords: nanocomposite; nickel cobalt sulfide; reduced graphene oxide; supercapacitor.