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Bulletin of the Korean Chemical Society (BKCS)

ISSN 0253-2964(Print)
ISSN 1229-5949(Online)
Volume 26, Number 10
BKCSDE 26(10)
October 20, 2005 

Surface Renewable Hydrogen Ion-Selective Polymeric Composite Electrode Containing Iridium Oxide
Hongmei Quan, Won Kim, Koo-Chun Chung, Jongman Park*
Hydrogen ion selective electrode, Composite electrode, Iridium oxide
A surface renewable pH electrode was prepared by utilizing composite electrode technique. Iridium oxide micro-fine particles was prepared by hydrolysis of (NH4)2IrCl6 at elevated temperature. The iridium oxide particles were mixed with well-dispersed carbon black and then filtered. The mixture was suspended in DMF containing PVC as a binder. The mixture was precipitated rapidly by adding large amount of water. The precipitate was ground and pressure-molded to iridium oxide composite electrode material. The electrode showed linear response between pH 1-13 with 50 to 60 mV/pH slope. The electrode maintained the pH response without appreciable slope drift for 170 days if stored in deionized water. The electrode surface can be renewed reproducibly by simple grinding process whenever contaminated or deactivated.
1565 - 1568
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