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本文用交流电桥法测定了450℃时LiCl-KCl熔盐中某些固态金属的双层电容(C)和电压(V)的关系。C-V曲线的最低点估计了Pt,Ag,Cu和Al等四种金属的零电荷电势,它们分别为+0.2,-0.4,-0.6和1.0V。把本文测得的450℃时LiCl-KCl熔盐中四种金属的零电荷电势(ε),和文献中700℃时NaCl-KCl熔盐中的结果对应于各金属的电离自由能(△Z_2)作图,可得一直线。它平行于水溶液中的相应直线,并可以下式表示: ε=0.305(△Z_2/q)+A 这一结果表明,在二种氯化物熔盐中同种金属的零电荷电势无明显差别,和不同金属的零电荷电势之间的差别与水溶液中相似。因此,可以认为,熔盐中固态金属的零电荷电势仅与金属的本性有关。
In this paper, the relationship between the double-layer capacitance (C) and the voltage (V) of some solid-state metals in LiCl-KCl molten salt at 450 ℃ was measured by AC bridge method. The lowest point of the C-V curve estimates the zero charge potentials of the four metals Pt, Ag, Cu and Al, which are + 0.2, -0.4, -0.6 and 1.0V, respectively. The zero charge potential (ε) of the four metals in LiCl-KCl molten salt measured at 450 ° C and the results of NaCl-KCl molten salt at 700 ° C in the literature correspond to the ionization free energies (△ Z_2 ) Drawing, can be a straight line. It is parallel to the corresponding straight line in the aqueous solution and can be expressed as follows: ε = 0.305 (ΔZ 2 / q) + A This result shows that there is no significant difference in the zero charge potential of the same metals in both chloride molten salts, The difference between the zero charge potential of different metals is similar to that in aqueous solutions. Therefore, it is considered that the zero charge potential of the solid metal in the molten salt is only related to the nature of the metal.