氧化物电还原体系银/氯化银参比电极性能研究

Abstract

Abstract:

The investigation on reference electrode is one of the indispensable links in molten salt electrochemistry.Using mullite as the Ag/AgCl electrode separator material,Ag/AgCl reference electrode was prepared which would be applied to electrochemical reduction of oxides in LiCl molten salt system at 650 ℃.Open circuit potential method was employed to investigate the reference electrode performances including activation time,reversibility,polarization resistance,stability and reproducibility,etc.For instance,the stable electrode potential was obtained after 2 h activation of new reference electrode.The reference electrode might be polarized when small electronic current passed,while the polarization potential could be eliminated in few minutes after electricity was cut off.The results indicated that the mullite membrane Ag/AgCl reference electrode had the characteristics of short activation time and good electrode reversibility,polarization resistance,potential stability,parallelism and reproducibility.The development of mullite membrane Ag/AgCl reference electrode was able to provide a certain guiding significance for the future development of a more stable reference electrode for the electrochemical reduction of oxides in high temperature molten salt.

Key words: molten salt, mullite membrane, Ag/AgCl reference electrode

CLC Number:

TQ131.22

Cheng Zhongping,He Hui,Lin Rushan,Jia Yanhong,Xiao Yiqun,Ye Guoan. Study on performance of Ag/AgCl reference electrode in oxide electrochemical reduction system[J]. Inorganic Chemicals Industry, 2019, 51(5): 49-52.

Figures/Tables 9

References 13

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温度/ ℃	理论电位差/mV	实际电位差/mV	温度/ ℃	理论电位差/mV	实际电位差/mV
650	55.11	56.34	710	58.69	61.42
670	56.31	58.21	730	59.89	62.50
690	57.50	59.59	750	61.08	64.00

极化电流/mA	电位/ V	平衡时间/min	电位变化值/mV	极化电流/mA	电位/ V	平衡时间/min	电位变化值/mV
1	0.476	1.18	3	-5	0.315	1.83	15
-1	0.389	0.95	0	10	1.931	3.42	34
5	1.784	3.33	20	-10	0.265	2.83	27

参比电极	电位差/mV	参比电极	电位差/mV
1^#和2^#	3.3	7^#和8^#	-3.5
3^#和4^#	7.4	9^#和10^#	-10.4
5^#和6^#	-4.1

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Study on performance of Ag/AgCl reference electrode in oxide electrochemical reduction system

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