期刊
JOURNAL OF ALLOYS AND COMPOUNDS
卷 874, 期 -, 页码 -出版社
ELSEVIER SCIENCE SA
DOI: 10.1016/j.jallcom.2021.160030
关键词
Ultrathin Co3O4 nanosheets; Nanocomposites; L-alanine; Hydrothermal synthesis; Supercapacitors
资金
- Natural Science Foundation of Education Department of Guizhou Province [[2020]059, [2016]093]
- Guizhou Provincial Natural Science Foundation [[2021]065, [2016]1419]
- Shanxi Natural Science Foundation [201801D121070]
- National Natural Science Foundation of China [21766040]
The study introduces a general strategy for fabricating ultrathin nanosheets of transitional metal oxides on Ni foam, showcasing the promising performance of Co3O4-ns@NF with high specific capacity and excellent energy storage abilities.
In this work, we present a general strategy for the fabrication of ultrathin nanosheets structured transitional metal oxides on Ni foam with the assistance of L-alanine, which highlights the controllable hydrolysis of cobalt-alanine complex under mild hydrothermal conditions. Specially, Co3O4 nanosheets with the thick-ness of approximately 3 nm and interlamellar spacing of about 1 nm are grown on Ni foam (denoted as Co3O4-ns@NF). The unique configuration favors the deep penetration of electrolyte within electrode matrix and thus enhances the utilization of electroactive Co3O4. As a result, the present Co3O4-ns@NF manifests a high specific capacity of 882 C.g(-1) at 2 A.g(-1) and excellent stability with 92.9% specific capacity retention after 5000 cycles at elevated current density (20 A.g(-1)). Moreover, the asymmetric supercapacitor fabricated by electrodes of Co3O4-ns@NF and activated carbon exhibits excellent energy storage abilities, such as high energy and power densities (66.6 Wh.kg(-1) at 2250 W.kg(-1)), high rate capability as well as excellent cycling stability, demonstrating the great potential of the present Co3O4-ns@NF in high performance super-capacitors. (C) 2021 Elsevier B.V. All rights reserved.
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