Gold and silver anchored cobalt porphyrins used for catalytic water splitting
In natural photosynthesis, the energy in sunlight is used to rearrange the bonds present in water to produce oxygen and hydrogen. Artificial systems that perform water splitting require catalysts that assist the production of hydrogen from water without excessive reduction potential. Consequently a...
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2015
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| Acceso en línea: | https://bibliotecadigital.exactas.uba.ar/collection/paper/document/paper_02540584_v159_n_p159_MoralesVasquez http://hdl.handle.net/20.500.12110/paper_02540584_v159_n_p159_MoralesVasquez |
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paper:paper_02540584_v159_n_p159_MoralesVasquez2023-06-08T15:21:57Z Gold and silver anchored cobalt porphyrins used for catalytic water splitting Electrochemical properties Electrochemical techniques Inorganic compounds Catalysts Cobalt Electrochemical properties Electrodes Gold Hydrogen bonds Inorganic compounds Porphyrins Redox reactions Reduction Silver Artificial systems Cobalt porphyrins Cyclic voltammograms Different solvents Electrocatalytic reduction Electrochemical techniques Modified electrodes Production of hydrogen Hydrogen production In natural photosynthesis, the energy in sunlight is used to rearrange the bonds present in water to produce oxygen and hydrogen. Artificial systems that perform water splitting require catalysts that assist the production of hydrogen from water without excessive reduction potential. Consequently a cobalt porphyrin({cobaltII-5,10,15,20-tetrakis[3-(p-acetylthiopropoxy) phenyl]porphyrin}[Co-P]) covalently bound to gold or silver has been tested as a catalyst for reduction and oxidation of H<inf>2</inf>O to H<inf>2</inf> and O<inf>2,</inf> respectively. In the cyclic voltammogram CoIII/CoII and CoII/CoI reversible waves were observed at potentials close to the expected values. The addition of water increased the cathodic peak for the CoII/CoI wave, consistent with the electrocatalytic reduction of water. In aqueous buffers the current increased for catalytic [Co-P] with decreasing pH. Similar results are obtained by changing the solvent or metal electrode to which the porphyrin is adsorbed. This leads to a reduction in the redox potential for the H+/H<inf>2</inf> couple by 200 mV. The material (Au°-[Co-P]) shows good efficiency and robustness for the electrochemical production of H<inf>2</inf> in different solvents and buffers in contrast to results previously seen for other porphyrins in solutions. The modified electrode Au°-[Co-P] shows high stability, and it is not damaged after several cycles. It can be stored in a CH<inf>2</inf>Cl<inf>2</inf> solution and reused several times. © 2015 Elsevier B.V. 2015 https://bibliotecadigital.exactas.uba.ar/collection/paper/document/paper_02540584_v159_n_p159_MoralesVasquez http://hdl.handle.net/20.500.12110/paper_02540584_v159_n_p159_MoralesVasquez |
| institution |
Universidad de Buenos Aires |
| institution_str |
I-28 |
| repository_str |
R-134 |
| collection |
Biblioteca Digital - Facultad de Ciencias Exactas y Naturales (UBA) |
| topic |
Electrochemical properties Electrochemical techniques Inorganic compounds Catalysts Cobalt Electrochemical properties Electrodes Gold Hydrogen bonds Inorganic compounds Porphyrins Redox reactions Reduction Silver Artificial systems Cobalt porphyrins Cyclic voltammograms Different solvents Electrocatalytic reduction Electrochemical techniques Modified electrodes Production of hydrogen Hydrogen production |
| spellingShingle |
Electrochemical properties Electrochemical techniques Inorganic compounds Catalysts Cobalt Electrochemical properties Electrodes Gold Hydrogen bonds Inorganic compounds Porphyrins Redox reactions Reduction Silver Artificial systems Cobalt porphyrins Cyclic voltammograms Different solvents Electrocatalytic reduction Electrochemical techniques Modified electrodes Production of hydrogen Hydrogen production Gold and silver anchored cobalt porphyrins used for catalytic water splitting |
| topic_facet |
Electrochemical properties Electrochemical techniques Inorganic compounds Catalysts Cobalt Electrochemical properties Electrodes Gold Hydrogen bonds Inorganic compounds Porphyrins Redox reactions Reduction Silver Artificial systems Cobalt porphyrins Cyclic voltammograms Different solvents Electrocatalytic reduction Electrochemical techniques Modified electrodes Production of hydrogen Hydrogen production |
| description |
In natural photosynthesis, the energy in sunlight is used to rearrange the bonds present in water to produce oxygen and hydrogen. Artificial systems that perform water splitting require catalysts that assist the production of hydrogen from water without excessive reduction potential. Consequently a cobalt porphyrin({cobaltII-5,10,15,20-tetrakis[3-(p-acetylthiopropoxy) phenyl]porphyrin}[Co-P]) covalently bound to gold or silver has been tested as a catalyst for reduction and oxidation of H<inf>2</inf>O to H<inf>2</inf> and O<inf>2,</inf> respectively. In the cyclic voltammogram CoIII/CoII and CoII/CoI reversible waves were observed at potentials close to the expected values. The addition of water increased the cathodic peak for the CoII/CoI wave, consistent with the electrocatalytic reduction of water. In aqueous buffers the current increased for catalytic [Co-P] with decreasing pH. Similar results are obtained by changing the solvent or metal electrode to which the porphyrin is adsorbed. This leads to a reduction in the redox potential for the H+/H<inf>2</inf> couple by 200 mV. The material (Au°-[Co-P]) shows good efficiency and robustness for the electrochemical production of H<inf>2</inf> in different solvents and buffers in contrast to results previously seen for other porphyrins in solutions. The modified electrode Au°-[Co-P] shows high stability, and it is not damaged after several cycles. It can be stored in a CH<inf>2</inf>Cl<inf>2</inf> solution and reused several times. © 2015 Elsevier B.V. |
| title |
Gold and silver anchored cobalt porphyrins used for catalytic water splitting |
| title_short |
Gold and silver anchored cobalt porphyrins used for catalytic water splitting |
| title_full |
Gold and silver anchored cobalt porphyrins used for catalytic water splitting |
| title_fullStr |
Gold and silver anchored cobalt porphyrins used for catalytic water splitting |
| title_full_unstemmed |
Gold and silver anchored cobalt porphyrins used for catalytic water splitting |
| title_sort |
gold and silver anchored cobalt porphyrins used for catalytic water splitting |
| publishDate |
2015 |
| url |
https://bibliotecadigital.exactas.uba.ar/collection/paper/document/paper_02540584_v159_n_p159_MoralesVasquez http://hdl.handle.net/20.500.12110/paper_02540584_v159_n_p159_MoralesVasquez |
| _version_ |
1768544727448158208 |