Effect of Anode Materials on NF 3 Formation
| Autor: | Makoto Aritsuka, Tomoo Kawagoe, Tetsuro Tojo, Atsushi Takuwa, Akimasa Tasaka, Masako Yamanaka |
|---|---|
| Rok vydání: | 1998 |
| Předmět: |
Renewable Energy
Sustainability and the Environment Nickel oxide Inorganic chemistry Oxide chemistry.chemical_element Electrolyte Condensed Matter Physics Electrochemistry Electrochemical fluorination Surfaces Coatings and Films Electronic Optical and Magnetic Materials Anode Nickel chemistry.chemical_compound chemistry Materials Chemistry Current density |
| Zdroj: | Journal of The Electrochemical Society. 145:1160-1164 |
| ISSN: | 1945-7111 0013-4651 |
| Popis: | The electrolytic formation of NF 3 from molten salt, NH 4 F-HF, KF-NH 4 F-HF, and CSF-NH 4 F-HF, with different anodes, was compared. The current efficiencies for NF 3 formation on a Ni anode and a LiF impregnated carbon (LiF/C) anode in the NH 4 F-HF melt increased with an increase of the current density and became constant at current densities higher than 120 and 50 mA/cm 2 , respectively. Current efficiencies on the Ni anode were greater than those on the LiF/C anode in the range of current density higher than 30 mA/cm 2 . On the other hand, the presence of KF in the melt reduced the NF 3 current efficiency on both the Ni and the LiF/C anodes, and the NF 3 current efficiency on the LiF/C anode in the KF-NH 4 F-HF melt decreased with an increase of the current density. According to the surface analyses, the oxide film on the Ni anode polarized in the NH 4 -F-HF melt was composed of nickel difluoride, some highly oxidized nickel fluoride, and nickel oxide or oxyfluoride having plural valences. Consequently, highly oxidized nickel fluoride on the Ni anode is considered to function as a mediator of the electrochemical fluorination under discussion. |
| Databáze: | OpenAIRE |
| Externí odkaz: |
|