Kinetics of the hydrogen electrode reaction on gold in acid sulphate melts
The hydrogen-electrode reaction on gold prepared in different ways has been investigated in molten acid sulphates at temperatures from ca 180 to 345°C. Potentiostatic and galvanostatic measurements under steady conditions were performed and the evolution of the potential of the working electrode whe...
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| Formato: | Articulo |
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1968
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| Acceso en línea: | http://sedici.unlp.edu.ar/handle/10915/121952 https://www.sciencedirect.com/science/article/abs/pii/0013468668870288?via%3Dihub |
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I19-R120-10915-1219522023-04-10T18:38:10Z http://sedici.unlp.edu.ar/handle/10915/121952 https://www.sciencedirect.com/science/article/abs/pii/0013468668870288?via%3Dihub issn:0013-4686 Kinetics of the hydrogen electrode reaction on gold in acid sulphate melts Arvia, Alejandro Jorge Vega, Fermín de Videla, Héctor A. 1968 2021-08-02T14:28:36Z en Química Ciencias Exactas Hydrogen-electrode reaction Gold Molten acid sulphates The hydrogen-electrode reaction on gold prepared in different ways has been investigated in molten acid sulphates at temperatures from ca 180 to 345°C. Potentiostatic and galvanostatic measurements under steady conditions were performed and the evolution of the potential of the working electrode when current was switched on and off was recorded. Current/voltage curves followed a Tafel law at cathodic overvoltages higher than 0-050 V. Slopes ranging from RT/2F to about 2RT/F are reported, depending on the preparation of the electrode, temperature and overvoltage region considered. Anodic current/voltage curves exhibit a limiting current. From the linear overvoltage/current region the reaction resistance was estimated for the anodic reaction. The exchange cds calculated from the reaction resistance agree with the values extrapolated from the Tafel lines having a slope RT/2F, if the stoichiometric number involved in the mechanism of the reaction is one. Electrode potential decayed logarithmically with time. Experimental electrode capacitances were evaluated from the time dependence of electrode potential. The hydrogen-electrode reaction is discussed in terms of a mechanism involving a fast hydrogenion discharge followed by a combination reaction as rate-determining step. The behaviour of the hydrogen-electrode reaction on gold in acid sulphate melts resembles that in aqueous acid solutions at ordinary temperatures. Instituto de Investigaciones Fisicoquímicas Teóricas y Aplicadas Articulo Articulo http://creativecommons.org/licenses/by/4.0/ Creative Commons Attribution 4.0 International (CC BY 4.0) application/pdf 581-602 |
| institution |
Universidad Nacional de La Plata |
| institution_str |
I-19 |
| repository_str |
R-120 |
| collection |
SEDICI (UNLP) |
| language |
Inglés |
| topic |
Química Ciencias Exactas Hydrogen-electrode reaction Gold Molten acid sulphates |
| spellingShingle |
Química Ciencias Exactas Hydrogen-electrode reaction Gold Molten acid sulphates Arvia, Alejandro Jorge Vega, Fermín de Videla, Héctor A. Kinetics of the hydrogen electrode reaction on gold in acid sulphate melts |
| topic_facet |
Química Ciencias Exactas Hydrogen-electrode reaction Gold Molten acid sulphates |
| description |
The hydrogen-electrode reaction on gold prepared in different ways has been investigated in molten acid sulphates at temperatures from ca 180 to 345°C. Potentiostatic and galvanostatic measurements under steady conditions were performed and the evolution of the potential of the working electrode when current was switched on and off was recorded. Current/voltage curves followed a Tafel law at cathodic overvoltages higher than 0-050 V. Slopes ranging from RT/2F to about 2RT/F are reported, depending on the preparation of the electrode, temperature and overvoltage region considered. Anodic current/voltage curves exhibit a limiting current. From the linear overvoltage/current region the reaction resistance was estimated for the anodic reaction. The exchange cds calculated from the reaction resistance agree with the values extrapolated from the Tafel lines having a slope RT/2F, if the stoichiometric number involved in the mechanism of the reaction is one. Electrode potential decayed logarithmically with time. Experimental electrode capacitances were evaluated from the time dependence of electrode potential. The hydrogen-electrode reaction is discussed in terms of a mechanism involving a fast hydrogenion discharge followed by a combination reaction as rate-determining step. The behaviour of the hydrogen-electrode reaction on gold in acid sulphate melts resembles that in aqueous acid solutions at ordinary temperatures. |
| format |
Articulo Articulo |
| author |
Arvia, Alejandro Jorge Vega, Fermín de Videla, Héctor A. |
| author_facet |
Arvia, Alejandro Jorge Vega, Fermín de Videla, Héctor A. |
| author_sort |
Arvia, Alejandro Jorge |
| title |
Kinetics of the hydrogen electrode reaction on gold in acid sulphate melts |
| title_short |
Kinetics of the hydrogen electrode reaction on gold in acid sulphate melts |
| title_full |
Kinetics of the hydrogen electrode reaction on gold in acid sulphate melts |
| title_fullStr |
Kinetics of the hydrogen electrode reaction on gold in acid sulphate melts |
| title_full_unstemmed |
Kinetics of the hydrogen electrode reaction on gold in acid sulphate melts |
| title_sort |
kinetics of the hydrogen electrode reaction on gold in acid sulphate melts |
| publishDate |
1968 |
| url |
http://sedici.unlp.edu.ar/handle/10915/121952 https://www.sciencedirect.com/science/article/abs/pii/0013468668870288?via%3Dihub |
| work_keys_str_mv |
AT arviaalejandrojorge kineticsofthehydrogenelectrodereactionongoldinacidsulphatemelts AT vegaferminde kineticsofthehydrogenelectrodereactionongoldinacidsulphatemelts AT videlahectora kineticsofthehydrogenelectrodereactionongoldinacidsulphatemelts |
| _version_ |
1765659835902197760 |