Design and preparation of Cu-doped NiCo2O4 nanosheets with intrinsic porosities for symmetric supercapacitors

• Published in: Materials letters Vol. 278; p. 128400
• Main Authors: Han, Xuanxuan, Song, Lili, Ding, Jiandong, Hu, Liangliang, Xu, Cuirong, Wang, Yuqiao
• Format: Journal Article
• Language: English
• Published: Amsterdam Elsevier B.V 01.11.2020; Elsevier BV
• Subjects: Capacitance; Conductivity; Cu-doped; Density functional theory; Electrodes; Electron states; Electron transfer; Flux density; Functional; Intrinsic porosity; Ion diffusion; Materials science; Nanosheets; Nickel compounds; Structural; Supercapacitors; Functional; Intrinsic porosity; Conductivity; Cu-doped; Structural
• ISSN: 0167-577X; 1873-4979
• DOI: 10.1016/j.matlet.2020.128400

[Display omitted] •The Cu-doping tuned the NiCo2O4 electronic structure.•The porous structure facilitated the transfer pathways for electrons and ions.•The electrochemical performance of Cu-doped NiCo2O4 was enhanced. The Cu-doped NiCo2O4 nanosheets with intrinsic porosities were designed and prepared by the density functional theory and hydrothermal method. Cu-doping can increase the electron states near Fermi level and partially delocalized charge, indicating the enhanced metallic properties of NiCo2O4. The intrinsic porosities can ensure a rapid electron transfer and ion diffusion during the electrochemical charge/discharge process. As a three-electrode cell, the Cu-NiCo2O4 electrode gained the capacitance retention of 78.8% after 3000 cycles at 1 A g−1. The symmetric supercapacitor revealed the energy density of 20.5 W h kg−1 at the power density of 558.5 W kg−1. The capacitance retention can be remained about 94.6% after 3000 cycles at 3 A g−1.