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<p>Owing to its unique properties, iridium has received special attention in the fields of high-tech. Herein, adhesive, uniform, and dense iridium coatings were electrodeposited on carbon fibers from aqueous solution. The microstructure and morphology, chemical composition, and phase of iridium coating on carbon fibers were determined by scanning electron microscopy, energy dispersive spectroscopy, and X-ray photoelectron spectroscopy and X-ray diffraction, respectively. Microstructural and morphological analyses revealed that the iridium coatings synthesized has h thicknesses of 160–800&#xa0;nm and were uniform, smooth, crack-free, and had good adhesion to carbon fibers pretreated with acidic solution. Moreover, crystallographic analyses showed that iridium coating on the entire assembly of the fibers was composed of a face-centered-cubic polycrystalline phase with random orientation. The average grain size of the coating was approximately 9.6&#xa0;nm. The chemical composition of the top-most surface of the coating consisted of the metallic state (Ir<sup>0</sup>) and the oxide (IrO<sub>2</sub>). Based on the above promising morphological, structural, chemical, and crystallographic properties of the coatings, the nucleation and growth process of the coating on the surface of carbon fibers were studied and addressed. Consequently, electrodeposition is a proficient technique for preparing uniform and dense iridium coatings on the surface of carbon fibers while ensuring excellent adhesion properties.</p>

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Synthesis and microstructure of iridium coatings by electrodeposition on carbon fibers

  • 期刊论文

  • 发表日期：

    2025年1月10日

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  • Wangping Wu,
  • Yu-ao An,
  • Zhengjie Xing,
  • Liu Ju,
  • Qinqin Wang,
  • Zhizhi Wang,
  • Meng Wu,
  • Guangyuan Wang

摘要

Owing to its unique properties, iridium has received special attention in the fields of high-tech. Herein, adhesive, uniform, and dense iridium coatings were electrodeposited on carbon fibers from aqueous solution. The microstructure and morphology, chemical composition, and phase of iridium coating on carbon fibers were determined by scanning electron microscopy, energy dispersive spectroscopy, and X-ray photoelectron spectroscopy and X-ray diffraction, respectively. Microstructural and morphological analyses revealed that the iridium coatings synthesized has h thicknesses of 160–800 nm and were uniform, smooth, crack-free, and had good adhesion to carbon fibers pretreated with acidic solution. Moreover, crystallographic analyses showed that iridium coating on the entire assembly of the fibers was composed of a face-centered-cubic polycrystalline phase with random orientation. The average grain size of the coating was approximately 9.6 nm. The chemical composition of the top-most surface of the coating consisted of the metallic state (Ir0) and the oxide (IrO2). Based on the above promising morphological, structural, chemical, and crystallographic properties of the coatings, the nucleation and growth process of the coating on the surface of carbon fibers were studied and addressed. Consequently, electrodeposition is a proficient technique for preparing uniform and dense iridium coatings on the surface of carbon fibers while ensuring excellent adhesion properties.