Nanocrystalline Ni-C electrodeposits prepared in electrolytes containing supercritical carbon dioxide

Sung Ting Chung, Wen-Ta Tsai

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36 Citations (Scopus)

Abstract

Electrodeposition of Ni in a Watt's bath at different applied pressures and in the presence of supercritical CO2 (sc-CO2), either with or without surfactant addition, was investigated. The current efficiency was evaluated under constantly applied current density conditions. The crystal structure of the resulting Ni film was characterized by performing X-ray diffraction. The composition of the deposit was analyzed using X-ray photoelectron spectroscopy. Transmission electron microscopy was employed for microstructure analysis. Microhardness of the deposited film was measured to distinguish the role of bath composition. The experimental results showed that carbon-containing nanocrystalline Ni films could be obtained in the bath with the presence of sc-CO2. A significant increase in microhardness was found for the film electrodeposited in sc-CO2 fluid, as compared with that formed in plain aqueous electrolyte. The fine grain size and solid solution strengthening caused by carbon were responsible for the increased hardness.

Original languageEnglish
JournalJournal of the Electrochemical Society
Volume156
Issue number11
DOIs
Publication statusPublished - 2009 Oct 13

All Science Journal Classification (ASJC) codes

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

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