Copper-Copper Sulfate Reference Electrode for Operating in High Temperature and High Pressure Aqueous Environments

Derek M. Hall, Justin R. Beck, Edward Brand, Margaret Ziomek-Moroz, Serguei N. Lvov

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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.

Original languageEnglish (US)
Pages (from-to)96-106
Number of pages11
JournalElectrochimica Acta
Volume221
DOIs
StatePublished - Dec 10 2016

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All Science Journal Classification (ASJC) codes

  • Chemical Engineering(all)
  • Electrochemistry

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