Synthesis of Co 3O 4 nanosheets via electrodeposition followed by ozone treatment and their application to high-performance supercapacitors

Chung Wei Kung, Hsin Wei Chen, Chia Yu Lin, R. Vittal, Kuo Chuan Ho

研究成果: Article同行評審

116 引文 斯高帕斯(Scopus)

摘要

A thin film of Co 3O 4 nanosheets is electrodeposited on a flexible Ti substrate by a one-step potentiostatic method, followed by an UV-ozone treatment for 30 min. The films before and after the UV-ozone treatment are characterized with X-ray diffraction (XRD) and X-ray photoelectron spectroscopy (XPS). The film is composed of Co(OH) 2 before UV-ozone treatment, and of Co 3O 4 after the treatment. The morphologies of both films are examined by scanning electron microscopy (SEM) and transmission electron microscope (TEM). The obtained films are composed of nanosheets, and there is no change in their sheet-like morphology before and after the UV-ozone treatment. When applied for a supercapacitor, the Co 3O 4 modified Ti electrode (Co 3O 4/Ti) shows a far higher capacitance than that of the Co(OH) 2 modified Ti electrode. The electrodeposition time and NaOH concentration in the electrolyte are optimized. A remarkably high specific capacitance of 1033.3 F g -1 is obtained for the Co 3O 4 thin film at a charge-discharge current density of 2.5 A g -1. The long-term stability data shows that there is still 77% of specific capacitance remaining after 3000 repeated charge-discharge cycles. The high specific capacitance and long-term stability suggest the potential use of Co 3O 4/Ti for making a flexible supercapacitor.

原文English
頁(從 - 到)91-99
頁數9
期刊Journal of Power Sources
214
DOIs
出版狀態Published - 2012 9月 15

All Science Journal Classification (ASJC) codes

  • 可再生能源、永續發展與環境
  • 能源工程與電力技術
  • 物理與理論化學
  • 電氣與電子工程

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