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| ON THE ZERO CHARGE POTENTIALS OF SOLID METAL ELECTRODES IN MOLTEN SALT |
| by PENG Ruiwu; ZHANG Junyue (Shanghai Institute of Metallurgy; Academia Sinica) |
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Cite this article:
by PENG Ruiwu; ZHANG Junyue (Shanghai Institute of Metallurgy; Academia Sinica). ON THE ZERO CHARGE POTENTIALS OF SOLID METAL ELECTRODES IN MOLTEN SALT. Acta Metall Sin, 1983, 19(3): 72-76.
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Abstract The double layer capacitances and zero charge potentials of certain solid metal electrodes in LiCl-KCl melts at 450℃ have been measured by an A. C. bridge method. The zero charge potentials, ε, for Pt, Ag, Cu and Al electrodes are +0.2, -0.4, -0.6 and -1.0 V respectively which was estimated by the minima of C-V curves. If these data together with selected ones from published works in NaCl-KCl melt at 700℃ plotted against their own ionization free energy, △Z_2, a straight line, paralleled that in aqueous solution, may be drawn and expressed as:ε=0.305(△Z_2/q)+Awhere q——1 mole electron charge and A——constant.It indicates that the zero charge potentials between two chlorides molten salt are alike of same solid metals but differ of different ones, and their difference is similar to that in aqueous solution. Thus, it seems to be proposed that the zero charge potentials of the solid metals in molten salts are only determined by the nature of metals themself.
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Received: 18 March 1983
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