INVESTIGADORES
SUAREZ Sebastian
artículos
Título:
Gold and silver adsorbed cobalt porphyrins used for catalytic water splitting
Autor/es:
MIGUEL ANGEL MORALEZ VAZQUEZ; SEBASTIAN SUAREZ; FABIO DOCTOROVICH
Revista:
MATERIALS CHEMISTRY AND PHYSICS
Editorial:
ELSEVIER SCIENCE SA
Referencias:
Lugar: Amsterdam; Año: 2015 vol. 159 p. 159 - 159
ISSN:
0254-0584
Resumen:
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 covalently bound to gold or silver ({cobalt(II)5,10,15,20-tetrakis [3-(p-acetylthiopropoxy) phenyl] porphyrin} [Co-P]) has been tested as a catalyst for reduction and oxidation of H2O to H2 and O2, respectively. In the cyclic voltammogram Co(III)/Co(II) and Co(II)/Co(I) reversible waves were observed at potentials close to the expected values. The addition of water increased the cathodic peak for the Co(II)/Co(I) 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+/H2 couple by 200 mV. The material shows good efficiency and robustness for the electrochemical production of H2 in different solvents and buffers in contrast to results previously seen for other porphyrins in solutions.
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