Rich-grain-boundary Ni-Co-Se nanowire arrays for fast charge storage in alkaline electrolyte

Li Wang; Mengqi Cui; Jianwei Ren; Hui Wang; Qianqian Fu

doi:10.1088/1361-6528/acf71f

Rich-grain-boundary Ni-Co-Se nanowire arrays for fast charge storage in alkaline electrolyte

Nanotechnology. 2023 Nov 3;35(3). doi: 10.1088/1361-6528/acf71f.

Authors

Li Wang¹, Mengqi Cui², Jianwei Ren³, Hui Wang², Qianqian Fu²

Affiliations

¹ School of Chemistry & Environmental Engineering, Pingdingshan University, Pingdingshan 467000, People's Republic of China.
² College of Chemical Engineering, Qingdao University of Science and Technology, Qingdao, 266042, People's Republic of China.
³ Department of Mechanical Engineering Science, University of Johannesburg, Cnr Kingsway and University Roads, Auckland Park, 2092, Johannesburg, South Africa.

PMID: 37673042
DOI: 10.1088/1361-6528/acf71f

Abstract

In this work, the one-dimensional (1D) Ni-Co-Se nanowire arrays with rich grain-boundaries were prepared through the solvothermal method and gas-phase selenizaiton. The results showed that the structure and crystallization of the Ni-Co-Se nanowire arrays could be modulated through the optimization of selenizaiton time. The optimal Ni-Co-Se electrode sample displayed an area specific capacitance of 242.6μAh cm^-2at 30 mA cm^-2with a current retention rate of 68.34%. The assembled Ni-Co-Se/Active carbon (AC) electrode-based asymmetric supercapacitor (ASC) showed the area specific capacitances of 329.2μAh cm^-2and 225.8μAh cm^-2at 3 mA cm^-2and 30 mA cm^-2, respectively. A 73.33% retention rate of capacitance was observed after 8000 charge/discharge cycles. Besides, the further fabricated all-solid ASC delivered the power densities of 342.94 W kg^-1and 3441.33 W kg^-1at the energy densities of 37.62 Wh kg^-1and 25.81 Wh kg^-1, respectively. Those results suggested the potentials of the obtained Ni-Co-Se nanowire arrays as electrode material for the high-performance pseudocapacitors.

Keywords: 1D nanowires; NiCo2O4; Se-doping; energy storage capacity; grain boundary.