Kinetics of the discharge of nitrite ions in the electrolysis of molten nitrites on graphite electrodes
The discharge of nitrite ions in the electrolysis of molten nitrites on graphite electrodes of known porosity has been studied in the temperature range 245–340° C. Conventional current/voltage curves, and build-up and decay of the working electrode potential, were determined. In the whole range of c...
Guardado en:
| Autores principales: | , |
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| Formato: | Articulo |
| Lenguaje: | Inglés |
| Publicado: |
1967
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| Acceso en línea: | http://sedici.unlp.edu.ar/handle/10915/121936 https://www.sciencedirect.com/science/article/abs/pii/0013468667800586 |
| Aporte de: |
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I19-R120-10915-121936 |
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dspace |
| institution |
Universidad Nacional de La Plata |
| institution_str |
I-19 |
| repository_str |
R-120 |
| collection |
SEDICI (UNLP) |
| language |
Inglés |
| topic |
Ciencias Exactas Química Nitrite ions Electrolysis Anodic process |
| spellingShingle |
Ciencias Exactas Química Nitrite ions Electrolysis Anodic process Arvia, Alejandro Jorge Calandra, Alfredo J. Kinetics of the discharge of nitrite ions in the electrolysis of molten nitrites on graphite electrodes |
| topic_facet |
Ciencias Exactas Química Nitrite ions Electrolysis Anodic process |
| description |
The discharge of nitrite ions in the electrolysis of molten nitrites on graphite electrodes of known porosity has been studied in the temperature range 245–340° C. Conventional current/voltage curves, and build-up and decay of the working electrode potential, were determined. In the whole range of current density and temperature investigated the anodic process is characterized by a Tafel slope of 2RT/3F. Decay and Tafel slopes tend to coincide at the highest current densities. Electrode capacitance measurements at the initial potential suggest a roughness factor of about 50 for graphite electrodes. The results are interpreted in terms of the following reaction schemes:
(Ia) NO<sub>2</sub>− + C ⇌ (NO<sub>2</sub>)C + e,
(IIa) (NO<sub>2</sub>)C + NO<sub>2</sub>− → (N<sub>2</sub>O<sub>4</sub>) + C + e,
(IIIa) (N<sub>2</sub>O<sub>4</sub>) ⇌ 2NO<sub>2</sub>,
and
(Ia) NO<sub>2</sub>− + C ⇌ (NO<sub>2</sub>)C + e,
(IIb) (NO<sub>2</sub>)C → NO<sub>2</sub>+ + C + e,
(IIIb) NO<sub>2</sub>+ + NO<sub>2</sub>− ⇌ (N<sub>2</sub>O<sub>2</sub>) ⇌ 2NO<sub>2</sub>,
where either reaction (IIa) or (IIb) is the rate-determining step, assuming a low electrode surface coverage by reaction intermediates. Data from non-steady measurements are rather scattered and this is ascribed to probable diffusion of nitrogen dioxide through the porous electrode material. |
| format |
Articulo Articulo |
| author |
Arvia, Alejandro Jorge Calandra, Alfredo J. |
| author_facet |
Arvia, Alejandro Jorge Calandra, Alfredo J. |
| author_sort |
Arvia, Alejandro Jorge |
| title |
Kinetics of the discharge of nitrite ions in the electrolysis of molten nitrites on graphite electrodes |
| title_short |
Kinetics of the discharge of nitrite ions in the electrolysis of molten nitrites on graphite electrodes |
| title_full |
Kinetics of the discharge of nitrite ions in the electrolysis of molten nitrites on graphite electrodes |
| title_fullStr |
Kinetics of the discharge of nitrite ions in the electrolysis of molten nitrites on graphite electrodes |
| title_full_unstemmed |
Kinetics of the discharge of nitrite ions in the electrolysis of molten nitrites on graphite electrodes |
| title_sort |
kinetics of the discharge of nitrite ions in the electrolysis of molten nitrites on graphite electrodes |
| publishDate |
1967 |
| url |
http://sedici.unlp.edu.ar/handle/10915/121936 https://www.sciencedirect.com/science/article/abs/pii/0013468667800586 |
| work_keys_str_mv |
AT arviaalejandrojorge kineticsofthedischargeofnitriteionsintheelectrolysisofmoltennitritesongraphiteelectrodes AT calandraalfredoj kineticsofthedischargeofnitriteionsintheelectrolysisofmoltennitritesongraphiteelectrodes |
| bdutipo_str |
Repositorios |
| _version_ |
1764820449135427589 |