A5029352707- Electrochemical Analysis and Applications
- Electrocatalysts for Energy Conversion
- Molecular Junctions and Nanostructures
- Catalytic Processes in Materials Science
- Electrochemical sensors and biosensors
- Analytical Chemistry and Sensors
- Conducting polymers and applications
- Fuel Cells and Related Materials
- CO2 Reduction Techniques and Catalysts
- Ionic liquids properties and applications
- Spectroscopy and Quantum Chemical Studies
- Advanced battery technologies research
- Ammonia Synthesis and Nitrogen Reduction
- Catalysis and Oxidation Reactions
- Electrodeposition and Electroless Coatings
- Gas Sensing Nanomaterials and Sensors
- Surface and Thin Film Phenomena
- Microbial Fuel Cells and Bioremediation
- Surface Chemistry and Catalysis
- Gold and Silver Nanoparticles Synthesis and Applications
- Advanced Photocatalysis Techniques
- Force Microscopy Techniques and Applications
- Machine Learning in Materials Science
- nanoparticles nucleation surface interactions
- Advanced Chemical Physics Studies
University of Alicante
2016-2025
Universität Innsbruck
2021
Universidad Nacional de Colombia
2009-2010
Pontifical Catholic University of Puerto Rico
2008-2010
University of Puerto Rico-Mayaguez
2008-2010
Universidad de Oviedo
2008-2010
Universidade Federal de Sergipe
2009-2010
Universidade de São Paulo
2009
Universidad de Sevilla
2009
Centro de Astrobiología
2008
Abstract The transfer coefficient α is a quantity that commonly employed in the kinetic investigation of electrode processes. In 3 rd edition IUPAC Green Book, cathodic c defined as –( RT / nF )( d ln k /d E ), where electroreduction rate constant, applied potential, and R, T , F have their usual significance. This definition equivalent to other, -( ln| j |/d current density corrected for any changes reactant concentration at surface with respect its bulk value. anodic similarly, by simply...
The kinetics of the electrochemical oxidation a CO adlayer on Pt[n(111)×(111)] electrodes in 0.5 M H2SO4 has been studied using chronoamperometry. objective is to elucidate effect crystalline defects rate reaction by series stepped surfaces. main oxidative process can be modeled mean-field approximation for Langmuir−Hinshelwood mechanism, implying fast diffusion adsorbed surfaces under conditions. apparent constant oxidation, determined fitting experimental data with model, found...
The quantitative analysis of the different surface sites on platinum samples is attempted from pure voltammetric data. This requires independent knowledge fraction two-dimensional (111) and (100) domains. Specific site-probe reactions are employed to achieve this goal. Irreversibly-adsorbed bismuth tellurium have been revealed be sensitive presence terrace domains width whereas almost all involved in ordered characterized through germanium adatoms. experimental protocol follows that used...
The voltammetric profile of preferentially shaped platinum nanoparticles has been used to analyze the different sites present on surface. For first time, this analysis made in NaOH solutions and revisited sulfuric perchloric acid media. comparison with profiles model surfaces, that is, single-crystal electrodes, allows assigning signals appearing voltammograms nanoparticle specific A good correlation between shape determined by TEM is obtained. characterized alkaline media, adsorbed species...
The study of the oxygen reduction reaction (ORR) at high-index Pt(hkl) single crystal surfaces has received considerable interest due to their well-ordered, typical atomic structures and superior catalytic activities. However, it is difficult obtain direct spectral evidence ORR intermediates during processes, especially surfaces. Herein, in situ Raman spectroscopy been employed investigate processes containing [011̅] zone—i.e., Pt(211) Pt(311). Through control isotope substitution...
Oxygen reduction reaction (ORR) dynamics at platinum single crystal surfaces is reviewed, and experimental results in acid alkaline solutions are discussed the framework of theoretical studies. Special emphasis devoted to point out role surface charge, water structure adsorbed oxygen containing species. Additionally, discussion about possible relevance hydrogen peroxide as an intermediate species also included. It shown that ORR a complex process affected by many different factors so neither...
Direct ethanol fuel cells are one of the most promising electrochemical energy conversion devices for portable, mobile and stationary power applications. However, more efficient stable less expensive electrocatalysts still required. Interestingly, performance toward oxidation reaction can be remarkably enhanced by exploiting benefits structural compositional sensitivity control. Here, we describe synthesis, characterization, behavior cubic Pt–Sn nanoparticles. The activity nanoparticles was...
The study of the OH adsorption process on Pt single crystals is paramount importance since this adsorbed species considered main intermediate in many electrochemical reactions interest, particular, those oxidation that require a source oxygen. So far, it frequently assumed only takes place at potentials higher than 0.55 V (versus reversible hydrogen electrode), regardless surface structure. However, by CO displacement experiments, alternating current voltammetry, and Raman spectroscopy, we...
Reactivity towards methanol and formic acid electrooxidation on Pt nanoparticles with well characterised surfaces were studied compared the behaviour of single crystal electrodes basal orientations. Polyoriented preferential (100), (111) (100)-(111) synthesised, cleaned preserving its surface structure, employed to evaluate influence structure/shape these two relevant electrochemical reactions. The results pointed out that, in agreement fundamental studies electrodes, structure plays an...
The electro-oxidation of d- and l-glucose has been investigated using the chiral electrode Pt{643}R its enantiomorph Pt{643}S. Both electrodes are demonstrated to be enantioselective. We ascribe this behavior inherent (left or right) "handedness" kink sites present at surface. In contrast, no difference in oxidation could detected stepped Pt{211} Pt{332} electrodes. Stepped surfaces achiral, since they lack prerequisite necessary for observation chirality, namely sites. For Pt{531}, a...
The adsorption of CO and the electrochemical oxidation a adlayer on stepped Pt electrodes, Pt(443), Pt(332), Pt(322), has been studied using in situ infrared reflection−absorption spectroscopy (IRAS). Coverage-dependent potential-dependent spectra adlayers surfaces are reported. Infrared acquired during provide information mechanism reaction structure operational catalytic active site. adsorbed (111) terraces is found to be more reactive compared that either (110) or (100) steps. step trough...
Down to the wire: electro-active bacteria that exchange electrons with solid electrodes are studied by electrochemical and infrared techniques. The approach allows identification of cell-surface molecules involved in direct electron transfer electrode, a development is crucial for future utilization these electricity-producing microorganisms. Supporting information this article available on WWW under http://www.wiley-vch.de/contents/jc_2002/2008/z801310_s.pdf or from author. Please note:...