Catálogo de Investigaciones 2015-2016

CATÁLOGO DE INVESTIGACIONES | AÑO ACADÉMICO 2015-2016 43 Molecular Adsorption Studies at Bead Type Polycrystalline Platinum Electrodes Electrochemical reactivity is sensitive to compositional and structural changes in the electrode surface. However, it is necessary to use ultra clean glassware, ultra pure water and high-purity reagents in order to control the compositions of the electrodes interface. It is possible to induce the presence of well-ordered Pt (111) facets on platinum bead type electrodes by gently heating the metal and cool ultra-pure water. This technique called Zone Refining spontaneously creates Pt (111) facets on the surface of the noble metal bead and also serves to purify the metal. In this work Cyclic Voltammetry (CV) is used, to correlate Current (i) vs Potential (V) curves that served as a fingerprint of the electrode surface compositions and structure. CV allow us to corroborate the presence of small Pt (111) well ordered-domains at Pt bead type electrodes prepared in this project. Organic molecules as Catechol or Hydroquinone have been previously reported in our laboratory as domain selective probes. These molecules reveal a signal associated to reductive desorption that only occurs at well-ordered Pt(111) facets. We can use these domain selective molecules or probes to confirm the presence well-ordered Pt (111) facets at our bead type electrodes. This associations was established when well-ordered Pt (111) facets were disordered electrochemically. If the facets are disordered, quinonereproductive desorption process associated to the well-ordered Pt (111) facets disappears. We can assume that this protocol detection can help study others quinoidal molecules of biological interest to elucidate id they exhibit the same electrochemical behavior. josé j. mercado maestría en ciencias con especialidad en química mentor: dra. margarita rodríguez lópez nivel de conocimiento electrocardiograma enfermería