材料期刊网

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。

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.