Interface pH regulation to improve ORR performance of FePc catalyst in acid electrolyte
Iron–nitrogen doped carbon (Fe/N/C) electrocatalysts are among the most promising materials to replace Pt for the oxygen reduction reaction (ORR). Up to now, most work has been devoted to improving the performance of Fe/N/C catalysts by material design, while ignoring the design of the electrode/ele...
| Main Authors: | , , , |
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| Format: | Article |
| Language: | English |
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Elsevier
2022-08-01
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| Series: | Electrochemistry Communications |
| Subjects: | |
| Online Access: | http://www.sciencedirect.com/science/article/pii/S138824812200159X |
| _version_ | 1798031351161552896 |
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| author | Yu-Yang Li Yu-Cheng Wang Zhi-You Zhou Shi-Gang Sun |
| author_facet | Yu-Yang Li Yu-Cheng Wang Zhi-You Zhou Shi-Gang Sun |
| author_sort | Yu-Yang Li |
| collection | DOAJ |
| description | Iron–nitrogen doped carbon (Fe/N/C) electrocatalysts are among the most promising materials to replace Pt for the oxygen reduction reaction (ORR). Up to now, most work has been devoted to improving the performance of Fe/N/C catalysts by material design, while ignoring the design of the electrode/electrolyte interface environment. Considering the superior ORR performance of Fe/N/C catalysts in alkaline electrolyte, we attempt to construct a proton-deficient environment at the electrode surface to raise the local pH value. An anion-exchange ionomer with H+ blocking ability was chosen as the binder of the iron phthalocyanine (FePc) catalyst, a model molecule for Fe/N/C. The anion-exchange ionomer can increase the interface pH value as compared with commonly used Nafion binder, which was verified by the electrochemical shell-isolated nanoparticle-enhanced Raman spectroscopy (SHINERS) technique with CO32–/HCO3– as a probe. This strategy significantly improves the ORR activity and stability of the FePc catalyst in acidic medium. |
| first_indexed | 2024-04-11T19:56:08Z |
| format | Article |
| id | doaj.art-a40e4ae8e38245b8b6f9b086d7c01cc2 |
| institution | Directory Open Access Journal |
| issn | 1388-2481 |
| language | English |
| last_indexed | 2024-04-11T19:56:08Z |
| publishDate | 2022-08-01 |
| publisher | Elsevier |
| record_format | Article |
| series | Electrochemistry Communications |
| spelling | doaj.art-a40e4ae8e38245b8b6f9b086d7c01cc22022-12-22T04:06:03ZengElsevierElectrochemistry Communications1388-24812022-08-01141107357Interface pH regulation to improve ORR performance of FePc catalyst in acid electrolyteYu-Yang Li0Yu-Cheng Wang1Zhi-You Zhou2Shi-Gang Sun3State Key Laboratory of Physical Chemistry of Solid Surfaces, Tan Kah Kee Innovation Laboratory, College of Chemistry and Chemical Engineering, Xiamen University, Xiamen 361005, ChinaCorresponding authors.; State Key Laboratory of Physical Chemistry of Solid Surfaces, Tan Kah Kee Innovation Laboratory, College of Chemistry and Chemical Engineering, Xiamen University, Xiamen 361005, ChinaCorresponding authors.; State Key Laboratory of Physical Chemistry of Solid Surfaces, Tan Kah Kee Innovation Laboratory, College of Chemistry and Chemical Engineering, Xiamen University, Xiamen 361005, ChinaState Key Laboratory of Physical Chemistry of Solid Surfaces, Tan Kah Kee Innovation Laboratory, College of Chemistry and Chemical Engineering, Xiamen University, Xiamen 361005, ChinaIron–nitrogen doped carbon (Fe/N/C) electrocatalysts are among the most promising materials to replace Pt for the oxygen reduction reaction (ORR). Up to now, most work has been devoted to improving the performance of Fe/N/C catalysts by material design, while ignoring the design of the electrode/electrolyte interface environment. Considering the superior ORR performance of Fe/N/C catalysts in alkaline electrolyte, we attempt to construct a proton-deficient environment at the electrode surface to raise the local pH value. An anion-exchange ionomer with H+ blocking ability was chosen as the binder of the iron phthalocyanine (FePc) catalyst, a model molecule for Fe/N/C. The anion-exchange ionomer can increase the interface pH value as compared with commonly used Nafion binder, which was verified by the electrochemical shell-isolated nanoparticle-enhanced Raman spectroscopy (SHINERS) technique with CO32–/HCO3– as a probe. This strategy significantly improves the ORR activity and stability of the FePc catalyst in acidic medium.http://www.sciencedirect.com/science/article/pii/S138824812200159XOxygen reduction reactionNon-precious metal catalystsMacrocyclic compoundInterface environmentIn situ Raman spectroscopy |
| spellingShingle | Yu-Yang Li Yu-Cheng Wang Zhi-You Zhou Shi-Gang Sun Interface pH regulation to improve ORR performance of FePc catalyst in acid electrolyte Electrochemistry Communications Oxygen reduction reaction Non-precious metal catalysts Macrocyclic compound Interface environment In situ Raman spectroscopy |
| title | Interface pH regulation to improve ORR performance of FePc catalyst in acid electrolyte |
| title_full | Interface pH regulation to improve ORR performance of FePc catalyst in acid electrolyte |
| title_fullStr | Interface pH regulation to improve ORR performance of FePc catalyst in acid electrolyte |
| title_full_unstemmed | Interface pH regulation to improve ORR performance of FePc catalyst in acid electrolyte |
| title_short | Interface pH regulation to improve ORR performance of FePc catalyst in acid electrolyte |
| title_sort | interface ph regulation to improve orr performance of fepc catalyst in acid electrolyte |
| topic | Oxygen reduction reaction Non-precious metal catalysts Macrocyclic compound Interface environment In situ Raman spectroscopy |
| url | http://www.sciencedirect.com/science/article/pii/S138824812200159X |
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