Hierarchical Three-Dimensional Nanoflower-Like Cuco2o4@Cuco2s4@Co(Oh)2 Core-Shell Composites as Supercapacitor Electrode Materials with Ultrahigh Specific Capacitances

37 Pages Posted: 29 Sep 2023

See all articles by Chunxiao Wang

Chunxiao Wang

Qingdao University

Yawen Liu

Qingdao University

Yuesheng Sun

Qingdao University

Haizhou Xu

Qingdao University

Jiangtao Xu

Qingdao University

Jingquan Liu

Qingdao University - Institute for Graphene Applied Technology Innovation

Abstract

Here, we prepare three-dimensional nanoflower-shaped CuCo2O4@CuCo2S4@Co(OH)2 core-shell materials on nickel foam (NF). CuCo2O4 (CuC) nanowire arrays and CuCo2S4 (CuS) nanosheets are grown directly on NF as the core through routine hydrothermal and high-temperature calcination methods and Co(OH)2 (CH) small nanosheets deposited on CuC@CuS nanoflowers via the potentiostatic deposition for 15 mins. Due to its distinctive structure and the synergistic effect between multiple components of CuCo2O4@CuCo2S4@Co(OH)2, the electrode has a fantastic specific capacitance (Cs, 4075 F g-1) under the current density of 1 A g-1 and satisfying cyclic stability (88.4% capacitance retention and 84.6% coulomb efficiency after 10000 cycles). Additionally, an asymmetric supercapacitor (ASC) device equipped with CuC@CuS@CH-15/NF as a positive and an active carbon (AC) electrode as a negative electrode can work steadily at 0-1.6 V. The ASC device can offer an excellent energy density (E, Wh kg-1) of 232.02 Wh kg-1 at a high-power density of 2879.8 W kg-1 (P, W kg-1) and an unexpected cycle stability (84.2% of the original Cs and 81.7% of coulombic efficiency after 10000 repeated GCD tests), which far surpasses other ASCs of the same type. These results provide guidance to enhance the electrochemical properties of cobalt-based oxides/sulfides@Co(OH)2 as the positive electrode for supercapacitors.

Keywords: core-shell structure, Supercapacitor, Three-dimensional structure, Nanoflower, CuCo2O4@CuCo2S4@Co(OH)2, Ultrahigh specific capacitances

Suggested Citation

Wang, Chunxiao and Liu, Yawen and Sun, Yuesheng and Xu, Haizhou and Xu, Jiangtao and Liu, Jingquan, Hierarchical Three-Dimensional Nanoflower-Like Cuco2o4@Cuco2s4@Co(Oh)2 Core-Shell Composites as Supercapacitor Electrode Materials with Ultrahigh Specific Capacitances. Available at SSRN: https://ssrn.com/abstract=4587377 or http://dx.doi.org/10.2139/ssrn.4587377

Chunxiao Wang

Qingdao University ( email )

No. 308 Ning Xia Road
Qingdao, 266071
China

Yawen Liu

Qingdao University ( email )

No. 308 Ning Xia Road
Qingdao, 266071
China

Yuesheng Sun

Qingdao University ( email )

No. 308 Ning Xia Road
Qingdao, 266071
China

Haizhou Xu

Qingdao University ( email )

No. 308 Ning Xia Road
Qingdao, 266071
China

Jiangtao Xu

Qingdao University ( email )

No. 308 Ning Xia Road
Qingdao, 266071
China

Jingquan Liu (Contact Author)

Qingdao University - Institute for Graphene Applied Technology Innovation ( email )

Qingdao
China

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