Effect of CsF-concentration on electrolytic conductivity, viscosity and anodic reaction of nickel electrode in (CH3)3N-CsF–HF system at room temperature |
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| Authors: | Akimasa Tasaka Kenta Nakanishi Noriaki Masuda Takaaki Nakai Koji Ikeda Kunitaka Momota Morihiro Saito Minoru Inaba |
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| Affiliation: | aDepartment of Applied Chemistry, Graduate School of Engineering, Doshisha University, 1-3 Miyako-dani, Tatara, Kyotanabe, Kyoto 610-0321, Japan;bDepartment of Molecular Chemistry and Biochemistry, Faculty of Science and Engineering, Doshisha University, 1-3 Miyako-dani, Tatara, Kyotanabe, Kyoto 610-0321, Japan;cMorita Chemical Industries Co. Ltd., 3-12 Higashi-mikuni, Yodogawa-ku, Osaka 532-0002, Japan |
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| Abstract: | In order to increase the formation ratio of perfluorotrimethylamine, (CF3)3N, to overall anode gas in electrolytic production using Ni anode, mixed melts of (CH3)3N·mHF + CsF·2.3HF were used as electrolytes at room temperature. The ionic conductivity of the mixed melts decreased with an increase in the CsF concentration, whereas the viscosity of the mixed melts increased with increasing the CsF concentration. AC impedance and XRD analysis revealed that the presence of CsNi2F6 in the oxidized layer formed on the Ni anode after electrolysis. The gas evolved at the Ni anode was composed of (CF3)3N, (CF3)2CHF2N, CF3(CHF2)2N, (CHF2)3N, CF4, NF3, CHF3, C2HF5, and C2F6. The best ratio of (CF3)3N to the overall anode gas (52.11%) was obtained in the electrolyte of (CH3)3N·5.0HF + 50 wt% CsF·2.3HF mixed melt at 20 mA cm−2. |
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| Keywords: | Electrochemical fluorination Perfluorotrimethylamine CsF additive Ni anode Room temperature molten salt |
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