Nickel Foam Supported Nicomomn-Based Oxide Nanosheets for High-Performance Electrochemical Energy Storage

Abstract

In this study, the NiCoMoMn-based oxide (NCMM) nanosheets were synthesized on nickel foams (NF) by a straightforward hydrothermal method followed by a calcination process. The resulting products exhibited a monoclinic crystal structure and featured a honeycomb-like architecture comprising nanosheet arrays and nanoflowers formed through the assembly of these nanosheets. A comparative analysis with the NiCoMo-based oxides (NCM) revealed that the NCMM nanosheets possessed larger dimensions, consequently yielding a honeycomb-like architecture with an increasing pore size. This structural advancement was found to facilitate electron transport within the electrodes, thus improving the energy storage performance of the products. As a result, NCMM electrodes have higher specific capacity and cycling stability. Moreover, the as-assembled hybrid supercapacitor device with the NCMM electrode displays large specific energy (40.65 W h kg−1 at the specific power of 500W kg−1) together with an ultrahigh cycle stability (maintaining 99% of its initial capacity after 5000 cycles). The research results demonstrate the potential of multicomponent transition metal oxides for electrochemical energy storage applications.

Keywords: Transition metal oxides, nanosheets, Hydrothermal method, Supercapacitor