Surface engineering of MOFs-derived Co₃O₄ nanosheets for high-performance supercapacitor

ABSTRACT

In this work, hierarchical edge-rich Co₃O₄ nanosheets (e-Co₃O_4NSs) arrays were synthesised on the surface of Ni foam via a self-templating technique using metal-organic frameworks (MOFs) as precursors. The morphology and surface of Co₃O_4NSs could be tailed using the potassium hexacyanocobaltate solution. The synthesised e-Co₃O_4NSs shows that numerous small nanosheets were in-situ grown on the large nanosheet substrates, forming a core-shell structure, which could provide more active sites for electrochemical reactions. Benefiting from the structural superiorities, the e-Co₃O_4NSs/Ni foam as supercapacitor electrode exhibits a high specific capacitance of 523 F g⁻¹, good rate capability (67.1% of capacitance retention at 10 A g⁻¹), as well as excellent cycling stability (89.6% of capacitance retention after 3000 cycles).

KEYWORDS:

• Co₃O₄
• supercapacitor
• MOFs
• surface engineering

Disclosure statement

No potential conflict of interest was reported by the authors.

Supplementary material

Supplemental data for this article can be accessed online at https://doi.org/10.1080/10667857.2022.2101567

Additional information

Funding

This work was supported by Natural Science Basic Research Plan in Shaanxi (2022JQ-324) and China Postdoctoral Science Foundation (Grant No. 2021M702659).