Carbon Material and Cobalt-Substitution Effects in the Electrochemical Behavior of LaMnO<sub>3</sub> for ORR and OER
LaMn<sub>1−x</sub>Co<sub>x</sub>O<sub>3</sub> perovskites were synthesized by a modified sol-gel method which incorporates EDTA. These materials’ electrochemical activity towards both oxygen reduction (ORR) and oxygen evolution reactions (OER) was studied. The cob...
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| Format: | Article |
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MDPI AG
2020-11-01
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| Series: | Nanomaterials |
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| Online Access: | https://www.mdpi.com/2079-4991/10/12/2394 |
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| author | Jhony X. Flores-Lasluisa Francisco Huerta Diego Cazorla-Amorós Emilia Morallon |
| author_facet | Jhony X. Flores-Lasluisa Francisco Huerta Diego Cazorla-Amorós Emilia Morallon |
| author_sort | Jhony X. Flores-Lasluisa |
| collection | DOAJ |
| description | LaMn<sub>1−x</sub>Co<sub>x</sub>O<sub>3</sub> perovskites were synthesized by a modified sol-gel method which incorporates EDTA. These materials’ electrochemical activity towards both oxygen reduction (ORR) and oxygen evolution reactions (OER) was studied. The cobalt substitution level determines some physicochemical properties and, particularly, the surface concentration of Co and Mn’s different oxidation states. As a result, the electroactivity of perovskite materials can be tuned using their composition. The presence of cobalt at low concentration influences the catalytic activity positively, and better bifunctionality is attained. As in other perovskites, their low electrical conductivity limits their applicability in electrochemical devices. It was found that the electrochemical performance improved significantly by physically mixing with a mortar the active materials with two different carbon black materials. The existence of a synergistic effect between the electroactive component and the carbon material was interpreted in light of the strong carbon–oxygen–metal interaction. Some mixed samples are promising electrocatalysts towards both ORR and OER. |
| first_indexed | 2024-03-10T14:25:53Z |
| format | Article |
| id | doaj.art-0fac392fa47f486bb95068eae8e013dc |
| institution | Directory Open Access Journal |
| issn | 2079-4991 |
| language | English |
| last_indexed | 2024-03-10T14:25:53Z |
| publishDate | 2020-11-01 |
| publisher | MDPI AG |
| record_format | Article |
| series | Nanomaterials |
| spelling | doaj.art-0fac392fa47f486bb95068eae8e013dc2023-11-20T22:57:53ZengMDPI AGNanomaterials2079-49912020-11-011012239410.3390/nano10122394Carbon Material and Cobalt-Substitution Effects in the Electrochemical Behavior of LaMnO<sub>3</sub> for ORR and OERJhony X. Flores-Lasluisa0Francisco Huerta1Diego Cazorla-Amorós2Emilia Morallon3Departamento Química Física e Instituto Universitario de Materiales, Universidad de Alicante, Ap. 99, E-03080 Alicante, SpainDepartamento Ingenieria Textil y Papelera, Universitat Politecnica de Valencia, Plaza Ferrandiz y Carbonell, 1, E-03801 Alcoy, SpainDepartamento Química Inorgánica e Instituto Universitario de Materiales, Universidad de Alicante, Ap. 99, E-03080 Alicante, SpainDepartamento Química Física e Instituto Universitario de Materiales, Universidad de Alicante, Ap. 99, E-03080 Alicante, SpainLaMn<sub>1−x</sub>Co<sub>x</sub>O<sub>3</sub> perovskites were synthesized by a modified sol-gel method which incorporates EDTA. These materials’ electrochemical activity towards both oxygen reduction (ORR) and oxygen evolution reactions (OER) was studied. The cobalt substitution level determines some physicochemical properties and, particularly, the surface concentration of Co and Mn’s different oxidation states. As a result, the electroactivity of perovskite materials can be tuned using their composition. The presence of cobalt at low concentration influences the catalytic activity positively, and better bifunctionality is attained. As in other perovskites, their low electrical conductivity limits their applicability in electrochemical devices. It was found that the electrochemical performance improved significantly by physically mixing with a mortar the active materials with two different carbon black materials. The existence of a synergistic effect between the electroactive component and the carbon material was interpreted in light of the strong carbon–oxygen–metal interaction. Some mixed samples are promising electrocatalysts towards both ORR and OER.https://www.mdpi.com/2079-4991/10/12/2394cobalt-substitutionLaMnO<sub>3</sub> perovskitecarbon materialsoxygen reduction reactionoxygen evolution reaction |
| spellingShingle | Jhony X. Flores-Lasluisa Francisco Huerta Diego Cazorla-Amorós Emilia Morallon Carbon Material and Cobalt-Substitution Effects in the Electrochemical Behavior of LaMnO<sub>3</sub> for ORR and OER Nanomaterials cobalt-substitution LaMnO<sub>3</sub> perovskite carbon materials oxygen reduction reaction oxygen evolution reaction |
| title | Carbon Material and Cobalt-Substitution Effects in the Electrochemical Behavior of LaMnO<sub>3</sub> for ORR and OER |
| title_full | Carbon Material and Cobalt-Substitution Effects in the Electrochemical Behavior of LaMnO<sub>3</sub> for ORR and OER |
| title_fullStr | Carbon Material and Cobalt-Substitution Effects in the Electrochemical Behavior of LaMnO<sub>3</sub> for ORR and OER |
| title_full_unstemmed | Carbon Material and Cobalt-Substitution Effects in the Electrochemical Behavior of LaMnO<sub>3</sub> for ORR and OER |
| title_short | Carbon Material and Cobalt-Substitution Effects in the Electrochemical Behavior of LaMnO<sub>3</sub> for ORR and OER |
| title_sort | carbon material and cobalt substitution effects in the electrochemical behavior of lamno sub 3 sub for orr and oer |
| topic | cobalt-substitution LaMnO<sub>3</sub> perovskite carbon materials oxygen reduction reaction oxygen evolution reaction |
| url | https://www.mdpi.com/2079-4991/10/12/2394 |
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