Effect of temperature on the voltammetric behavior of poly-o-toluidine
The voltammetric response of poly(o-toluidine) electrochemically grown films of about 62 nm thick was investigated in the temperature range 218-293 K, using 3.7 M sulfuric acid. The peak current, i p , corresponding to the first oxidation process decreases with temperature. The peak current depends...
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todo:paper_00134651_v145_n10_p3530_Florit2023-10-03T14:10:43Z Effect of temperature on the voltammetric behavior of poly-o-toluidine Florit, M.I. Posadas, D. Molina, F.V. Electric currents Electrochemistry Ions Organic polymers Oxidation Redox reactions Sulfuric acid Thermal effects Anion concentration Anodic sweep shift Discontinuity Peak current Polytoluidine Voltammetric response Conductive films The voltammetric response of poly(o-toluidine) electrochemically grown films of about 62 nm thick was investigated in the temperature range 218-293 K, using 3.7 M sulfuric acid. The peak current, i p , corresponding to the first oxidation process decreases with temperature. The peak current depends linearly on the sweep rate at all temperatures. At about 260-270 K, a discontinuity in the i p vs. T plot is observed. The peak potential for the anodic sweep shifts in the positive direction as the temperature is decreased and the full peak width at half-maximum, E w , increase as temperature is decreased. On the other hand, for the cathodic sweep, the peak potential just slightly shifts in the positive direction, and E w does not change as the temperature is decreased. In strongly acidic H 2 SO 4 solutions, the voltammetric capacity, i p v -1 , is found to be dependent on anion concentration rather than on pH. The temperature dependence of the voltammetric response is explained on the basis that the oxidation process is controlled by ionic movements into the polymer. As the temperature decreases, ionic movements become hindered and a decrease of the polymer voltammetric capacitive current, associated to the redox process, occurs. JOUR info:eu-repo/semantics/openAccess http://creativecommons.org/licenses/by/2.5/ar http://hdl.handle.net/20.500.12110/paper_00134651_v145_n10_p3530_Florit |
| institution |
Universidad de Buenos Aires |
| institution_str |
I-28 |
| repository_str |
R-134 |
| collection |
Biblioteca Digital - Facultad de Ciencias Exactas y Naturales (UBA) |
| topic |
Electric currents Electrochemistry Ions Organic polymers Oxidation Redox reactions Sulfuric acid Thermal effects Anion concentration Anodic sweep shift Discontinuity Peak current Polytoluidine Voltammetric response Conductive films |
| spellingShingle |
Electric currents Electrochemistry Ions Organic polymers Oxidation Redox reactions Sulfuric acid Thermal effects Anion concentration Anodic sweep shift Discontinuity Peak current Polytoluidine Voltammetric response Conductive films Florit, M.I. Posadas, D. Molina, F.V. Effect of temperature on the voltammetric behavior of poly-o-toluidine |
| topic_facet |
Electric currents Electrochemistry Ions Organic polymers Oxidation Redox reactions Sulfuric acid Thermal effects Anion concentration Anodic sweep shift Discontinuity Peak current Polytoluidine Voltammetric response Conductive films |
| description |
The voltammetric response of poly(o-toluidine) electrochemically grown films of about 62 nm thick was investigated in the temperature range 218-293 K, using 3.7 M sulfuric acid. The peak current, i p , corresponding to the first oxidation process decreases with temperature. The peak current depends linearly on the sweep rate at all temperatures. At about 260-270 K, a discontinuity in the i p vs. T plot is observed. The peak potential for the anodic sweep shifts in the positive direction as the temperature is decreased and the full peak width at half-maximum, E w , increase as temperature is decreased. On the other hand, for the cathodic sweep, the peak potential just slightly shifts in the positive direction, and E w does not change as the temperature is decreased. In strongly acidic H 2 SO 4 solutions, the voltammetric capacity, i p v -1 , is found to be dependent on anion concentration rather than on pH. The temperature dependence of the voltammetric response is explained on the basis that the oxidation process is controlled by ionic movements into the polymer. As the temperature decreases, ionic movements become hindered and a decrease of the polymer voltammetric capacitive current, associated to the redox process, occurs. |
| format |
JOUR |
| author |
Florit, M.I. Posadas, D. Molina, F.V. |
| author_facet |
Florit, M.I. Posadas, D. Molina, F.V. |
| author_sort |
Florit, M.I. |
| title |
Effect of temperature on the voltammetric behavior of poly-o-toluidine |
| title_short |
Effect of temperature on the voltammetric behavior of poly-o-toluidine |
| title_full |
Effect of temperature on the voltammetric behavior of poly-o-toluidine |
| title_fullStr |
Effect of temperature on the voltammetric behavior of poly-o-toluidine |
| title_full_unstemmed |
Effect of temperature on the voltammetric behavior of poly-o-toluidine |
| title_sort |
effect of temperature on the voltammetric behavior of poly-o-toluidine |
| url |
http://hdl.handle.net/20.500.12110/paper_00134651_v145_n10_p3530_Florit |
| work_keys_str_mv |
AT floritmi effectoftemperatureonthevoltammetricbehaviorofpolyotoluidine AT posadasd effectoftemperatureonthevoltammetricbehaviorofpolyotoluidine AT molinafv effectoftemperatureonthevoltammetricbehaviorofpolyotoluidine |
| _version_ |
1807323695018934272 |