Preparation of COF2 using CO2 and F2 in the electrochemical cell with PbSnF4 as a solid electrolyte |
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| Authors: | Yasuo Hasegawa Masayuki Takashima |
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| Institution: | a Department of Materials Science and Engineering, Faculty of Engineering, Fukui University, 3-9-1 Bunkyo, Fukui 910-8507, Japan
b Forensic Science Laboratory, Fukui Prefectural Police Headquarters, 3-17-1 Ote, Fukui 910-8515, Japan |
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| Abstract: | Tetragonal PbSnF4 was prepared by precipitation method with Pb(NO3)2 and SnF2 aqueous solutions. The product was characterized using X-ray diffraction (XRD), X-ray fluorescence spectroscopy (XFS), and the other chemical analyses. Tetragonal PbSnF4 exhibited the highest electric conductivity of 3.2 Sm−1 at 473 K in air as a fluoride ion conductor. We have investigated the possibility of COF2 formation using CO2 and F2 in an electrochemical cell with PbSnF4 as a solid electrolyte. At same time, we tried to produce an electric power from an electrochemical cell. This CO2/F2 electrochemical cell was constructed with a tetragonal PbSnF4 disk having Au electrodes. The electromotive force was about 0.9 V at room temperature for 0.1 MPa CO2/(0.01 MPa F2 + 0.09 MPa Ar). However, the short circuit current density was 0.24 A m−2, which was quite small. This current density was so small that no fluorocarbon compound was detected after 3 h discharge using FT-IR. |
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| Keywords: | COF2 Electrochemical preparation Solid electrolyte Tetragonal PbSnF4 |
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