Unfolding the Hidden Reactions in Galvanic Cells

作者：Noyhouzer Tomer; Bellemare Alford Daphnee; Payne Nicholas A; Martineau Eric; Mauzeroll Janine^*

来源：Electrocatalysis, 2018, 9(4): 531-538.

DOI：10.1007/s12678-018-0459-1

• Pourbaix diagrams
• Galvanic cells
• Corrosion
• Open circuit potential
• Thermodynamic measurements

The relationship between the potential of the cell reaction (E-cell), the entropy change (Delta S), and the enthalpy change (Delta H) is well established. Yet, there is surprisingly a very narrow range of experimental aqueous galvanic cells that follow thermodynamic predictions. The redox and equilibrium reactions used within Pourbaix diagrams are presented a priori to establish the limitations and application range of thermodynamic relationships within complex electrochemical systems, the Zn-Cu (Daniell cell) and Pb-Cu cells. These are then tested to validate the theoretical discussion. Specifically, the electromotive force of both cells is measured as a function of the temperature in order to calculate the thermodynamic properties of the reaction: concomitantly to the voltage measurements, the temperature, the pH, and the surface state of the electrodes.

• 出版日期2018-7
• 单位McGill