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Effect of metal fluorides in the electrolyte on the electrolytic production of NF3 by Akimasa Tasaka; Toshinori Osada; Tomoo Kawagoe; Megumi Kobayashi; Atsushi Takamuku; Kohtaro Ozasa; Tomonori Yachi; Toshiyuki Ichitani; Katsuhiko Morikawa is a Chemistry article available to read on EtoBox.

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Electrolysis of the melts of NH,F'2HF with and without metal fluorides such as LiF, NaF. KF, CsF, MgF,, and AIF was conducted with a nickel anode. The mixed gas composed of NF, and N? with a small amount of NZF,, N,FZ, N20, and 0, was liberated at the anode by electrolysis at 25 mA/cm, and at 120°C. The adclition of LiF into the melt was most effective for increasing the NF, current efficiency and for minimizing the consumption of nickel anode. In contrast, KF in the melt decreased the current efficiency for NF, and other constituents in the anode gas as well as hydrogen generated a: the cathode. It also stimulated the consumption of Ni anode. The concentration of nickel ion in the molten KF-NH,F-HF system was low sompared with that in the melts of NH,F' 2HF with and without alkali metal fluorides such as LiF and CsF because KNiF3 was deposited on the cathode and the cell bottom. The SEM observation and the XPS and XRD analyses revealed that the oxidized layer formed on nickel in molten NH,F. 2HF with and without LiF, CsF, and 0.3 mol% NaF was composed of NiFz with a small amount of Ni oxides of divalent and trivalent states and highly oxidized nickel fluorides. The surface layer f

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Author

Akimasa Tasaka; Toshinori Osada; Tomoo Kawagoe; Megumi Kobayashi; Atsushi Takamuku; Kohtaro Ozasa; Tomonori Yachi; Toshiyuki Ichitani; Katsuhiko Morikawa

Publisher

Elsevier Science; Elsevier ; Elsevier BV (ISSN 0022-1139)

Published

1998

Language

EN

Field

Chemistry (Physical Sciences)