報文
Novel Electrochemical Method of SiH4 Synthesis in Molten LiCl-KCl Systems, Part II: Advantages of Si-Cu Alloy Anode
2005 年 73 巻 8 号 p. 700-705
詳細
2005 年 73 巻 8 号 p. 700-705
Advantages of Si-Cu alloy anode for the SiH4 synthesis by molten salt electrochemical process have been investigated by comparing the electrochemical behavior of Si-Cu alloy with that of bare Si in molten LiCl-KCl systems at 673 K. The results of cyclic voltammetry and potentiostatic electrolysis at 2.8 V (vs. Li+/Li) revealed that use of Si-Cu alloy allows increasing both the current efficiency and the reaction rate for SiH4 evolution. It was also indicated that reducing Cu content is possible while maintaining sufficient current efficiency and reaction rate for SiH4 synthesis. On the other hand, the effect of preventing the passivation of anode was not sufficient for the alloy prepared in this study, although the electrolysis was successfully sustained longer than the bare Si case. Metallographic requirements for the appropriate Si alloy were discussed aiming for the achievement of a continuous electrolysis in the future.
