Issue 3, 2021

ZIF-67 derived tricobalt tetroxide induced synthesis of a sandwich layered Co3O4/NiNH electrode material for high performance supercapacitors

Abstract

Novel sandwich layered Co3O4/NiNH was synthesized as a high-performance electrode for supercapacitors under hydrothermal conditions. ZIF-67 derived rhombic dodecahedral Co3O4 broke into fine Co3O4 particles, inducing the growth and self-assembly of Ni3(NO3)2(OH)4 nanosheets to form sandwich layered Co3O4/NiNH. Meanwhile, oxygen vacancies were generated on the surface of Co3O4/NiNH. The sandwich layered structure and oxygen vacancies can effectively improve the charge and ion transfer at the Co3O4/NiNH electrode/electrolyte interface. The Co3O4/NiNH electrode exhibited a maximum specific capacity of 583 C g−1 at 1 A g−1. An asymmetric supercapacitor was assembled with Co3O4/NiNH as the positive electrode and active carbon as the negative electrode. The assembled device showed a high energy density of 42.6 W h kg−1 at a power density of 823 W kg−1. A stability test was conducted to evaluate the assembled device. After 10 000 cycles, the capacitor retention rate was 82.3%, indicating that the Co3O4/NiNH//AC device had excellent cycle stability. Co3O4/NiNH is a promising electrode material for commercial applications.

Graphical abstract: ZIF-67 derived tricobalt tetroxide induced synthesis of a sandwich layered Co3O4/NiNH electrode material for high performance supercapacitors

Supplementary files

Article information

Article type
Research Article
Submitted
09 Sep 2020
Accepted
09 Dec 2020
First published
10 Dec 2020

Mater. Chem. Front., 2021,5, 1438-1447

ZIF-67 derived tricobalt tetroxide induced synthesis of a sandwich layered Co3O4/NiNH electrode material for high performance supercapacitors

W. Hong, Y. Li, Y. Wu, G. Li and L. Jia, Mater. Chem. Front., 2021, 5, 1438 DOI: 10.1039/D0QM00692K

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