Free-Base Porphyrin Aggregates Combined with Nickel Phosphite for Enhanced Alkaline Hydrogen Evolution
In response to the escalating global energy requests and the need to address them in a sustainable manner, researchers have identified hydrogen as an energy vector that provides a practical way to store and use energy from renewable sources. To make a step forward, the electrocatalytic properties fo...
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| Format: | Article |
| Language: | English |
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MDPI AG
2023-01-01
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| Series: | Energies |
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| Online Access: | https://www.mdpi.com/1996-1073/16/3/1212 |
| _version_ | 1827760098797158400 |
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| author | Bogdan-Ovidiu Taranu Eugenia Fagadar-Cosma Paula Sfirloaga Maria Poienar |
| author_facet | Bogdan-Ovidiu Taranu Eugenia Fagadar-Cosma Paula Sfirloaga Maria Poienar |
| author_sort | Bogdan-Ovidiu Taranu |
| collection | DOAJ |
| description | In response to the escalating global energy requests and the need to address them in a sustainable manner, researchers have identified hydrogen as an energy vector that provides a practical way to store and use energy from renewable sources. To make a step forward, the electrocatalytic properties for the hydrogen evolution reaction in an alkaline medium of graphite electrodes modified with combinations of nickel phosphite and free-base porphyrins were investigated voltammetrically. The sample obtained by combining the respective phosphite with 5,10,15,20-tetrakis(4-methoxyphenyl)porphyrin exhibited the highest catalytic activity, surpassing that observed for the specimens manufactured using the individual catalysts and thus providing enhanced water-splitting performance. The best electrode displayed an overpotential of 0.43 V (at i = −10 mA/cm<sup>2</sup>) and a Tafel slope of 0.14 V/dec. Since the catalytic activity of the compositions containing the metal salt and the porphyrins has not been previously studied, the investigation and its outcome constitute an original contribution to the growing water-splitting literature, providing new opportunities for obtaining better results than the ones reported for electrodes modified solely with the phosphite. |
| first_indexed | 2024-03-11T09:45:39Z |
| format | Article |
| id | doaj.art-07101ea954ca4b43badb5a8fdceb868d |
| institution | Directory Open Access Journal |
| issn | 1996-1073 |
| language | English |
| last_indexed | 2024-03-11T09:45:39Z |
| publishDate | 2023-01-01 |
| publisher | MDPI AG |
| record_format | Article |
| series | Energies |
| spelling | doaj.art-07101ea954ca4b43badb5a8fdceb868d2023-11-16T16:34:16ZengMDPI AGEnergies1996-10732023-01-01163121210.3390/en16031212Free-Base Porphyrin Aggregates Combined with Nickel Phosphite for Enhanced Alkaline Hydrogen EvolutionBogdan-Ovidiu Taranu0Eugenia Fagadar-Cosma1Paula Sfirloaga2Maria Poienar3National Institute for Research and Development in Electrochemistry and Condensed Matter, Dr. A. Paunescu Podeanu Street No. 144, 300569 Timisoara, RomaniaInstitute of Chemistry “Coriolan Dragulescu”, Mihai Viteazu Ave. 24, 300223 Timisoara, RomaniaNational Institute for Research and Development in Electrochemistry and Condensed Matter, Dr. A. Paunescu Podeanu Street No. 144, 300569 Timisoara, RomaniaNational Institute for Research and Development in Electrochemistry and Condensed Matter, Dr. A. Paunescu Podeanu Street No. 144, 300569 Timisoara, RomaniaIn response to the escalating global energy requests and the need to address them in a sustainable manner, researchers have identified hydrogen as an energy vector that provides a practical way to store and use energy from renewable sources. To make a step forward, the electrocatalytic properties for the hydrogen evolution reaction in an alkaline medium of graphite electrodes modified with combinations of nickel phosphite and free-base porphyrins were investigated voltammetrically. The sample obtained by combining the respective phosphite with 5,10,15,20-tetrakis(4-methoxyphenyl)porphyrin exhibited the highest catalytic activity, surpassing that observed for the specimens manufactured using the individual catalysts and thus providing enhanced water-splitting performance. The best electrode displayed an overpotential of 0.43 V (at i = −10 mA/cm<sup>2</sup>) and a Tafel slope of 0.14 V/dec. Since the catalytic activity of the compositions containing the metal salt and the porphyrins has not been previously studied, the investigation and its outcome constitute an original contribution to the growing water-splitting literature, providing new opportunities for obtaining better results than the ones reported for electrodes modified solely with the phosphite.https://www.mdpi.com/1996-1073/16/3/1212porphyrinnickel phosphitemodified electrodeelectrocatalysiswater splitting |
| spellingShingle | Bogdan-Ovidiu Taranu Eugenia Fagadar-Cosma Paula Sfirloaga Maria Poienar Free-Base Porphyrin Aggregates Combined with Nickel Phosphite for Enhanced Alkaline Hydrogen Evolution Energies porphyrin nickel phosphite modified electrode electrocatalysis water splitting |
| title | Free-Base Porphyrin Aggregates Combined with Nickel Phosphite for Enhanced Alkaline Hydrogen Evolution |
| title_full | Free-Base Porphyrin Aggregates Combined with Nickel Phosphite for Enhanced Alkaline Hydrogen Evolution |
| title_fullStr | Free-Base Porphyrin Aggregates Combined with Nickel Phosphite for Enhanced Alkaline Hydrogen Evolution |
| title_full_unstemmed | Free-Base Porphyrin Aggregates Combined with Nickel Phosphite for Enhanced Alkaline Hydrogen Evolution |
| title_short | Free-Base Porphyrin Aggregates Combined with Nickel Phosphite for Enhanced Alkaline Hydrogen Evolution |
| title_sort | free base porphyrin aggregates combined with nickel phosphite for enhanced alkaline hydrogen evolution |
| topic | porphyrin nickel phosphite modified electrode electrocatalysis water splitting |
| url | https://www.mdpi.com/1996-1073/16/3/1212 |
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