Preparation of lanthanum nickel oxide-coated Ni sheet anodes and their application to electrolytic production of (CF(3))(3)N in (CH(3))(4)NF4.0HF melt

• Published in: Journal of rare earths Vol. 24; no. 1; pp. 1 - 8
• Main Authors: Shodai, Yoshio, Inaba, Minoru, Onoda, Kazuki, Tasaka, Akimasa
• Format: Journal Article
• Language: English
• Published: 01.02.2006
• ISSN: 1002-0721

A new process for electrolytic production of a perfluorinated compound, (CF(3))(3)N, using lanthanum nickel oxide-coated Ni sheet anode in the (CH(3))(4)NF*4.0HF melt at room temperature, was developed. Thin films of the lanthanum nickel oxides were prepared on Ni sheets by sol-gel coating method using polyvinlylpyrrolidone (PVP). The main components of the thin films were La(2)O(3), LaNiO(3), and La(2)NiO(4) at 500, 750 and 1000 deg C, respectively. The anode performance in the (CH(3))(4)NF*4.0HF melt depends greatly on the main component of the thin film, and the LaNiO(3)-coated Ni sheet anode gives the best anode performance. The potential of LaNiO(3)-coated Ni sheet anode remains constant at 5.9 V during electrolysis at 20 mA*cm(-2) in the ((CH(3))(4)NF*4.0HF melt for 100 h. This is because LaNiO(3) and NiF(3) and/or Ni(2)F(5), the latter of which was formed during electrolysis, in the film give a high electronic conductivity to the surface film during electrolysis. The maximum mole fraction of (CF(3))(3)N (21.4%) was obtained at 20 mA*cm(-2) in (CH(3))(4)NF*4.0HF melt using the LaNiO(3)-coated Ni sheet.