Hydrothermal Synthesis of Co3O4/ZnCo2O4Core-Shell Nanostructures for High-Performance Supercapacitors

En Syuan Lin, Feng Sheng Chao, Chen Jui Liang, Chi Jung Chang, Alex Fang, Chung Kwei Lin, Yu Cheng Chang, Chien Yie Tsay, Jerry J. Wu, Chin Yi Chen

Research output: Contribution to journalArticlepeer-review

Abstract

Supercapacitive properties of Co/ZnCo oxide composite with a core-shell nanostructure (Co3O4/ZnCo2O4) prepared directly onto a nickel foam substrate by a two-step hydrothermal method were investigated. The synthesized core-shell structure consisted of some ~40-100 nm in thick flaky ZnCo2O4 deposits coated onto the surface of Co3O4 nanorods measuring ~150 nm in diameter. The specific capacitance value of the Co3O4/ZnCo2O4 core-shell nanostructure synthesized by hydrothermal at 130 °C for a ZnCo2O4 deposition time of 2 h can attain 1804 F g-1 at a scan rate of 5 mV s-1. Furthermore, the core-shell structured electrode still exhibited a relatively good capacitance retention of more than 93% after 3000 CV cycles due to the superior structural support of Co3O4 scaffolds. The Co3O4/ZnCo2O4 core-shell structure exhibits excellent electrochemical performances and, as such, is one of the more promising active materials in pseudocapacitor applications.

Original languageEnglish
Article number123502
JournalJournal of the Electrochemical Society
Volume168
Issue number12
DOIs
Publication statusPublished - Dec 2021

ASJC Scopus subject areas

  • Electronic, Optical and Magnetic Materials
  • Renewable Energy, Sustainability and the Environment
  • Surfaces, Coatings and Films
  • Electrochemistry
  • Materials Chemistry

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