Investigation on a Feasible Microreference Electrode Based on IrO2

• Main Authors: Chang, Yubin, 張育斌
• Other Authors: Shuchi Chao
• Format: Others
• Language: zh-TW
• Published: 1997
• Online Access: http://ndltd.ncl.edu.tw/handle/57588882380617780789

碩士 === 國立交通大學 === 電子物理學系 === 85 === A microreference electrode based on sputtered IrO2 and an internal electrolyte derived from PVA / H3PO4 / KH2PO4 has been tested. The solid electrolyte consists of a buffer. An epoxy shield separaties the electrolyte from the external environment. Only a narrow salt bridge connects with the external electrolyte. Since the concentration of H+ in the internal electrolyte remains unchanged, according to the Nernst equation, the IrO2 potential should also be constant when shielded from external redox i The open-circuit of this IrO2 microreference electrode was found to have a temperature coefficient of 2.17 mV/℃. Under temperature control, it was found to be stable and reproduceable both in N2 and air purged KCl solutions. The potential drift is on the order of 35 mV/hr.