Unfolding the Hidden Reactions in Galvanic Cells
| Autor: | Nicholas A. Payne, Eric Martineau, Tomer Noyhouzer, Janine Mauzeroll, Daphnée Bellemare-Alford |
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| Rok vydání: | 2018 |
| Předmět: |
Materials science
Electromotive force 010401 analytical chemistry Enthalpy Thermodynamics 02 engineering and technology Pourbaix diagram 021001 nanoscience & nanotechnology Electrochemistry 01 natural sciences Redox 0104 chemical sciences Galvanic cell Daniell cell Chemical equilibrium 0210 nano-technology |
| Zdroj: | Electrocatalysis. 9:531-538 |
| ISSN: | 1868-5994 1868-2529 |
| DOI: | 10.1007/s12678-018-0459-1 |
| Popis: | The relationship between the potential of the cell reaction (Ecell), the entropy change (ΔS), and the enthalpy change (ΔH) 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. |
| Databáze: | OpenAIRE |
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