Journal
CATALYSIS SCIENCE & TECHNOLOGY
Volume 11, Issue 23, Pages 7632-7639Publisher
ROYAL SOC CHEMISTRY
DOI: 10.1039/d1cy01487k
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Funding
- Natural Science Foundation of Guangdong Province [2020A1515011430]
- Shenzhen Key Laboratory of New Lithium-ion Batteries and Mesoporous Materials
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A new type of three-dimensional NiO@NiCo2O4 hierarchical structure cathode has been developed, which can effectively enhance the discharge capacity and cycle stability of Li-O-2 batteries. NiCo2O4 is beneficial for the ORR/OER processes, while NiO provides a porous scaffold to avoid nanowires aggregation and promote by-products decomposition.
The development of high-performance cathodes is critical to promoting the development of Li-O-2 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-O-2 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-O-2 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-O-2 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-O-2 batteries.
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