A unique hierarchical structure: NiCo2O4 nanowire decorated NiO nanosheets as a carbon-free cathode for Li–O2 battery

Abstract

The development of high-performance cathodes is critical to promoting the development of Li–O2 batteries. In this work, three-dimensional NiCo2O4 nanowire-decorated NiO nanosheets (NiO@NiCo2O4) on a Ni foam were fabricated by a two-step solvothermal process. The product exhibited efficient catalytic performance for Li–O2 batteries. This three-dimensional NiO@NiCo2O4 hierarchical structures grown on Ni foam forms a porous catalytic surface for the uniform growth of discharge products. First, NiCo2O4 is a promising catalyst for improving the oxygen reduction reaction/oxygen evolution reaction (ORR/OER) processes for the Li–O2 batteries. Second, NiO can provide a porous scaffold for the further deposition of NiCo2O4 nanowires to avoid their aggregation. Furthermore, NiO can promote the decomposition of by-products containing carbonate/carboxylate species. As a result, the Li–O2 system with NiO@NiCo2O4 as a carbon-free cathode showed a maximum in-depth-specific discharge capacity of 9361.4 mA h g−1 at a current density of 100 mA g−1 and 176 cycles of stability under a limited capacity of 500 mA h g−1 at a current density of 200 mA g−1. The reported strategy regarding a multicomponent hierarchical structure may provide a new approach for effective electrocatalyst design for Li–O2 batteries.

Graphical abstract: A unique hierarchical structure: NiCo2O4 nanowire decorated NiO nanosheets as a carbon-free cathode for Li–O2 battery

Supplementary files

Article information

Article type
Paper
Submitted
16 Aug 2021
Accepted
10 Oct 2021
First published
15 Oct 2021

Catal. Sci. Technol., 2021, Advance Article

A unique hierarchical structure: NiCo2O4 nanowire decorated NiO nanosheets as a carbon-free cathode for Li–O2 battery

H. Wang, B. Fan, Z. Luo, Q. Wu, X. Zhou and F. Wang, Catal. Sci. Technol., 2021, Advance Article , DOI: 10.1039/D1CY01487K

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