A Ag/AgCl Reference Electrode with a Long Periodic Stability for use in LiCl-KCl-NaCl Molten Salt System Li Gouxun,Zhang Shnling Qiao Zhiyu,Wu Shimin,Yao Deikang,Wang Wingsheng ABSTRACT A Ag/AgCl reference electrode with pyrex glass and porcelain diaphr agm for use in Licl-KCl-NaCl molten salt system at 480-600C is descr- ibed.In order to ensure a long periodic stability of the reference electrode for hygroscopic molten salts a pyrex glass or porcelain tube conductive to sodium ions should be used as a diaphragm;besides,the water and the oxygen in the molten salts should be removed thoroughly and the assembled ele- ctrode should be sealed perfectly.The experimental results show that EMF of the reference electrode with pyrex glass diaphragm was stable and repro- ducible to within 5 mv,as well as temperature and current-reversible cycling over a period of 110 hours.The inflenence of temperature and concentrat- ion of AgCl to the electrode potential also has been discussed.It is shown that the concentration of AgCl chosen within 2-4 mol%may be better, 105A A g / A g C I R e f e r e n e e E l e e t r o d e w it h a L o n g P e r i o d i e S t a b ilit y f o r u s e i n L IC l e K C I一 N a C I M o l t e n S a l t S y s t e m L 1 G o u x u n , Z h a n g S h n l i n g Q i a o Z h i y u , W u S h i m i n , Y a o D e i k a n g , W a n g W i n g s h e n g A B S T RAC T A A g / A g C I r e f e r o n e e e l e e t r o d e w i t h p y r e x g l a s s a n d p o r e e l a i n d i a p h r a g m f o r u s e i n L IC I 一 K C I 一 N a C I m o l t e n s a l t s y s t e m a t 4 8 0 。 一 6 0 0 O C 1 5 d e s e r - i b e d . I n o r d e r * 0 e n s u r e a l o n g p e r i o d i e s t a b i l i t y o f t h e r e f e r e n e e e l e e t r o d e f o r h y g r o s e o p i e m o l t e n s a l t s a p y r e x g l a s s o r p o r e e l a i n t u b e e o n d u e t i v e t o s o d i u m i o n s s h o u l d b e u o e d a s a d i a p h r a g m , b e s i d e s , t h e w a t e r a h d t h e o x y g e n i n t h e m o l t e n s a l t s s h o u l d b e r e m o v e d t h o r o u g h l y a n d t h e a s s e m b l e d e l 。 - e t r o d e s h o u ld b e s e a l e d p e r f e e t l y . T h e e x p e r i m e n t a l r e s u l t s s h o w t l z a t E M F o f t h e r e f e r e n e e e l e e t r o d e w i t h P y r e x g l a s s d i a p h r a g m w a s s t a b l e a n d r e P r o 一 d u e i b l e t o w i t h i n 5 m v , a s w e l l a s t e m p e r a t u r e a n d c u r r e n t一 r e v e r s i b l e e y e l i n 心 o v e r a P e r i o d o f 1 10 h o u r s . T h e i n f l e n e n e e o f t e m P e r a t u r e a n d e d n e e n t r a t - l o n o f A g C I t o t h e e l e e t r o d e p o t e n t i a l a l s o h a s b e e n d i s e u s s e d . I t 1 5 s h o w n t h a t t h e e o n e e n t r a t i o n o f A g C I e h o s e n w i t h i n Z一 4 m o l % m a y b e b e t t e r . t 05