A study on the anode effect in KF-2HF system. II. Difference in anodic behavior between edge plane and layer-plane of pyrolytic graphite.
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概要
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The anodic behavior of pyrolytic graphite has been studied by voltammetry and ESCA analysis in the molten KF-2HF system at 100°C, attention being given to the difference in anodic behavior between the edge plane and layer-plane of the pyrolytic graphite. The polarization current obtained by a linear potential sweep experiment decreased rapidly with increasing potential after the onset of the anode effect. When the edge plane was used as a working electrode surface the current density was recovered on the subsequent sweep toward negative potentials, whereas the current density was hardly recovered on the layer-plane surface of the electrode. The difference in polarization behavior was interpreted on the basis of the difference in the rate of decomposition reaction of graphite fluoride, (CF)<I><SUB>n</SUB></I>, formed on the electrode surface. ESCA spectra of the electrodes polarized at various potentials indicate that (CF)<I><SUB>n</SUB></I> was formed even at 2.0 V <I>vs.</I> Pt, below the fluorine evolution potential, on the edge plane of the pyrolytic graphite and that its amount did not increase appreciably with increasing potential. On the layer-plane, however, no formation of (CF)<I><SUB>n</SUB></I> was observed at 2 V <I>vs.</I> Pt, its amount increasing appreciably with potential at the potentials above 3 V <I>vs.</I> Pt.
- 公益社団法人 日本化学会の論文
著者
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Imoto Hiroki
Department of Industrial Chemistry, Faculty of Engineering, Kyoto University
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Watanabe Nobuatsu
Department of Industrial Chemistry, Faculty of Engineering, Kyoto University
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