Copper-Copper Sulfate Reference Electrode for Operating in High Temperature and High Pressure Aqueous Environments. (10th December 2016)

• Record Type: Journal Article
• Authors: Hall, Derek M.; Beck, Justin R.; Brand, Edward; Ziomek-Moroz, Margaret; Lvov, Serguei N.
• Is Part Of: Electrochimica acta. Volume 221(2016)
• Page Start: 96
• Page End: 106
• Publication Date: 2016-12-10
• Subjects: copper-copper sulfate electrode -- high temperature and high pressure aqueous solutions -- Gibbs energy minimization -- reference electrode; Electrochemistry -- Periodicals; Electrochemistry, Industrial -- Periodicals; 541.37
• DOI: 10.1016/j.electacta.2016.10.143
• Languages: English
• ISSNs: 0013-4686

Abstract

Abstract: A copper-copper sulfate electrode (CSE) was constructed and tested at elevated temperatures. Experimental cell potentials versus a silver-silver chloride electrode were compared against results from Gibbs energy minimization (GEM) calculations. After accounting for irreversible thermodynamic processes, experimental and calculated CSE potentials, were generally within 3% of the observed potential from 25 to 150 °C at 3 MPa. The CSE potentials changed by less than 20 mV with increasing temperature, compared to 120 mV for the silver-silver chloride electrode. With its repeatability and small temperature dependence, the CSE electrode appears to be a viable reference electrode for measuring in-situ real time cell potentials in aqueous phase-containing media at elevated temperature and pressure.