3D heterostructured cobalt oxide@layered double hydroxide core-shell networks on nickel foam for high-performance hybrid supercapacitor

Luojiang Zhang, K. N. Hui, K. S. Hui, Siu Wing Or

Research output: Journal article publicationJournal articleAcademic researchpeer-review

8 Citations (Scopus)

Abstract

High performance of an electrode relies largely on scrupulous design of nanoarchitectures and smart hybridization of bespoke active materials. Here, a 3D heterostructured core-shell architecture was fabricated as a supercapacitor electrode, in which Co 3 O 4 nanowire cores were grown on nickel foam prior to the in situ deposition of layered double hydroxide (LDH) nanosheet shells. Owing to the unique configuration and hybridization, the as-fabricated Co 3 O 4 @LDH core-shell electrode exhibited high capacities of 818.6 C g −1 at 2 A g −1 and 479.3 C g −1 at 40 A g −1 (3.2 C cm −2 at 7.8 mA cm −2 and 1.87 C cm −2 at 156 mA cm −2 ), which were much higher than those of the individual components, namely, Co 3 O 4 and LDH. A hybrid supercapacitor with Co 3 O 4 @LDH as the positive electrode and graphene nanosheets as the negative electrode yielded an energy density of 53.2 W h kg −1 and a power density of 16.4 kW kg −1 , which outperformed devices reported in the literature; the device also exhibited long-term cycling stability and retained 71% of its initial capacity even after 10 000 cycles at 6 A g −1 . The rational design of the core-shell architecture may lead to the development of new strategies for fabricating promising electrode materials for electrochemical energy storage.

Original languageEnglish
Pages (from-to)150-157
Number of pages8
JournalDalton Transactions
Volume48
Issue number1
DOIs
Publication statusPublished - 7 Jan 2019

ASJC Scopus subject areas

  • Inorganic Chemistry

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