Rosa M. Arán Ais

Rosa M. Arán Ais
University of Alicante | UA · University Institute of Electrochemistry

PhD in Electrochemistry

About

40
Publications
6,813
Reads
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2,216
Citations
Additional affiliations
November 2018 - present
Fritz Haber Institute of the Max Planck Society
Position
  • PostDoc Position
February 2017 - present
Ruhr-Universität Bochum
Position
  • PostDoc Position
August 2014 - December 2014
Technische Universität Berlin
Position
  • PhD Visiting Student

Publications

Publications (40)
Chapter
The characterization of Pt single crystals surfaces decorated with adsorbed adatoms from the p-block is illustrated here. The main techniques for the decoration of Pt single crystals are under potential deposition (UPD) and irreversible adsorption. Several surface characterization techniques are available and have been proven to be complementary fo...
Article
The heterogeneous upgrading of biomass by means of electrocatalytic hydrogenation is an attractive way to refine products for industrial and pharmaceutical purposes. Also, the efficient electrochemical reduction of carbonyl compounds can act as hydrogen vectors, and therefore energy vectors. In this manuscript, we render further fundamental insight...
Article
To optimize fuel cells performance using alcohols as fuel it is essential to untangle the mechanism of the methanol electro-oxidation on platinum in aqueous medium as a model reaction. Recent studies have pointed out the particular necessity of adsorbed OH for this electro-oxidation process to take place ¹ . The here reported results, carefully obt...
Article
Ionic liquids have very interesting properties for their use in electrochemistry: they have a wide potential window of stability, high electrical conductivity and can replace water in processes in which water is not an appropriate solvent. Because of that, the number of studies has increased exponentially in recent years. When used in electrocataly...
Article
Full-text available
Convoluted selectivity trends and a missing link between reaction product distribution and catalyst properties hinder practical applications of the electrochemical CO2 reduction reaction (CO2RR) for multicarbon product generation. Here we employ operando X-ray absorption and X-ray diffraction methods with subsecond time resolution to unveil the sur...
Article
Untangling the mechanism of the methanol electro-oxidation on platinum in water as a model reaction is essential to optimize fuel cells using alcohols as fuel. Recent experiments unexpectedly suggested that this electro-oxidation process would take place only in the presence of adsorbed OH. The here reported results, carefully obtained under low me...
Article
Electrocatalyst surfaces prepared under ultrahigh vacuum (UHV) conditions can create model surfaces to better connect theoretical calculations with experimental studies. The development of a single crystal sample holder and inert electrochemical cells prepared with modularity and chemical stability in mind would allow for expensive single crystals...
Article
Full-text available
Using a combination of a sophisticated modeling protocol and well-established electrochemical techniques, we unravel the chemical composition of the low-index surfaces of copper in groundwater environments at different ion concentrations, pHs, and redox potentials. By carefully linking density functional theory (DFT) and cyclic voltammetry (CV), we...
Article
Full-text available
The formic acid oxidation reaction (FAOR) is one of the key reactions that can be used at the anode of low-temperature liquid fuel cells. To allow the knowledge-driven development of improved catalysts, it is necessary to deeply understand the fundamental aspects of the FAOR, which can be ideally achieved by investigating highly active model cataly...
Article
The rational design of better electrocatalysts for the oxidation of C1–C2 organic molecules requires the detailed knowledge of their oxidation mechanism. Pt single crystals are powerful tools to study, in a simple way, the surface structure effect on the different reaction pathways. Here, the oxidation mechanism of these molecules is compared so th...
Article
Investigating the Behavior of Cu-based Catalysts During Electrochemical CO2 Reduction with Liquid Cell Electron Microscopy - See Wee Chee, Aram Yoon, Rosa Aran-Ais, Ruben Rizo, Philipp Grosse, Beatriz Roldan Cuenya
Article
Full-text available
Copper is a widely studied catalyst material for the electrochemical conversion of carbon dioxide to valuable hydrocarbons. In particular, copper-based nanostructures expressing predominantly {100} facets have shown high selectivity toward ethylene formation, a desired reaction product. However, the stability of such tailored nanostructures under r...
Article
Full-text available
The efficient electrochemical conversion of CO2 provides a route to fuels and feedstocks. Copper catalysts are well-known to be selective to multicarbon products, although the role played by the surface architecture and the presence of oxides is not fully understood. Here we report improved efficiency towards ethanol by tuning the morphology and ox...
Article
Full-text available
Elektrolytgetriebene Nanostrukturierung wird für die Synthese von hochselektiven Cu‐Katalysatoren zur CO2‐Elektroreduktion zu C2+‐Produkten genutzt (80 % Faradayscher Wirkungsgrad). Abgesehen von einer erhöhten Rauigkeit infolge der Vorbehandlung begünstigen die Sauerstoffspezies unterhalb der Oberfläche, die Cu⁺‐Spezies und die adsorbierten Haloge...
Article
Full-text available
The production of multicarbon products (C2+) from CO2 electroreduction reaction (CO2RR) is highly desirable for storing renewable energy and reducing carbon emission. Here we report the electrochemical synthesis of CO2RR catalysts that are highly selective for C2+ products via electrolyte‐driven nanostructuring. Nanostructured Cu catalysts synthesi...
Article
Electrochemical reactions depend on the electrochemical interface between the electrode surfaces and the electrolytes. To control and advance electrochemical reactions there is a need to develop realistic simulation models of the electrochemical interface to understand the interface from an atomistic point-of-view. Here we present a method for obta...
Article
The CO 2 electroreduction reaction (CO 2 RR) to fuels and feedstocks is an attractive route to close the anthropogenic carbon cycle and store renewable energy. The generation of more reduced chemicals, especially multicarbon oxygenate and hydrocarbon products (C 2+ ) with higher energy densities, is highly desirable for industrial applications. How...
Article
The utilization of fossil fuels (i.e., coal, petroleum, and natural gas) as the main energy source gives rise to serious environmental issues, including global warming caused by the continuously increasing level of atmospheric CO2. To deal with this challenge, fossil fuels are being partially replaced by renewable energy such as solar and wind. How...
Article
Direct ethanol fuel cells (DEFC) are one of the most promising electrochemical energy conversion devices for portable, mobile and stationary power applications. However, more efficient and stable and less expensive electrocatalysts are still required. Interestingly, the electrochemical performance of the electrocatalysts towards the ethanol oxidati...
Article
In this work, Vulcan carbon-supported cube-shape Pt nanoparticles with various metal loadings were synthesised in the presence of oleylamine and oleic acid. Surface morphology of different Pt/C samples was examined by transmission electron microscopy (TEM) and their metal loading verified by thermogravimetric analysis (TGA). TEM micrographs showed...
Article
Previous knowledge shed by single crystal electrochemistry path the way to obtain better catalysts aiming fuel cell purposes. In this sense, tailoring shape-controlled nanoparticles has been a strategy followed over the past years to optimize the activity, selectivity and stability of electrocatalytic surface sensitive reactions by maximizing the e...
Article
To understand how the CO oxidation reaction proceeds on nanoparticles, which have complex surface structures, the behavior of the nanoparticles has to be related to that of single crystal electrodes with a well-defined surface structure. However, the direct extrapolation of the results is not possible because significant differences in the behavior...
Article
The effect of interfacial pH during the surface cleaning of shape-selected PtNi nanoparticles was investigated. High-angle annular dark field (HAADF) scanning transmission electron microscopy (STEM) and energy-dispersive X-ray (EDX) elemental mapping techniques were used to analyze the morphology and composition of the particles at the nanoscale. T...
Article
Adsorption and oxidation of glyoxylic acid (GA) on platinum single crystals were investigated by spectroelectrochemical techniques. Among basal planes, Pt(111) is taken as a model surface for reactivity studies in order to point out the CC bond breaking. For a standard GA concentration (0.1 M), self-poisoning by adsorbed CO (COads) is the main proc...
Article
In this communication we report a voltammetric study of the adsorption–desorption of cytosine (C) and methylcytosine (mC) on well-defined gold (Au) electrodes. The voltammetric measurements clearly indicate that these processes are extremely sensitive to the Au surface structure and in particular to the presence of (111) surface domains. Interestin...
Article
We have employed Identical Location Transmission Electron Microscopy (IL-TEM) to study changes in the shape and morphology of faceted Pt nanoparticles as a result of the electrochemical cycling; a procedure typically employed for activating platinum surfaces. We find that the shape and morphology of the as-prepared hexagonal nanoparticles are rapid...
Article
Multimetallic shape-controlled nanoparticles offer great opportunities to tune the activity, selectivity and stability of electrocatalytic surface reactions. However, in many cases, our synthetic control over particle size, composition and shape is limited requiring trial and error. Deeper atomic-scale insight in the particle formation process woul...
Article
Local changes of the interfacial pH can significantly affect the rate and mechanism during the course of an electrodic reaction. For instance, different pH values will have a significant effect on the equilibrium properties of both solution and surface species, altering the reactions kinetics. Ethanol oxidation at platinum electrodes in alkaline me...
Article
A collection of shape-controlled Pt nanoparticles has been prepared using two different and previously described methodologies, both using oleylamine/oleic acid as capping material/solvent. A new decontamination protocol is presented to effectively clean the surface of the different nanoparticles thus allowing a full exposure of their surface area...
Article
Full-text available
Kinetic glycolic acid (GA) oxidation and thermodynamic glycolate adsorption have been studied on Pt single crystal electrodes. The voltammetric profiles of Pt(111), Pt(100), and Pt(110) in 0.1 M GA are shown, and the effect of the inclusion of steps on the Pt(111) surface has been studied by cyclic voltammetry. For Pt(111) electrode, different conc...
Article
Controlled bimetallic catalyst materials can be obtained using atomic layer deposition (ALD) method. In this paper, this method was applied to prepare Pt, PtCo, and PtCoPt nanoparticle catalysts on carbon support. Their activity for ethanol oxidation was studied by various electrochemical methods and the dependency of the reaction on temperature an...
Conference Paper
Full-text available
The oxidation of ethanol (EtOH) at Pt(111) electrodes is dominated by the 4e path leading to acetic acid. The inclusion of surface defects such as those present on stepped surfaces leads to an increase of the reactivity towards the most desirable 12e path leading to CO2 as final product. This path is also favored when the methyl group is more oxidi...
Article
Full-text available
The electrocatalytic properties of palladium nanocubes towards the electrochemical oxidation of formic acid were studied in H(2)SO(4) and HClO(4) solutions and compared with those of spherical Pd nanoparticles. The spherical and cubic Pd nanoparticles were characterized by transmission electron microscopy (TEM) and X-ray diffraction (XRD). The intr...
Article
The voltammetric profile of preferentially shaped platinum nanoparticles has been used to analyze the different sites present on the surface. For the first time, this analysis has been made in NaOH solutions and revisited in sulfuric and perchloric acid media. The comparison with the voltammetric profiles of the model surfaces, that is, single-crys...
Article
We address in this paper a voltammetric study of the charge transfer processes characteristic of Pt(1 0 0) and vicinal surfaces in alkaline media. The electrochemical behavior of a series of stepped surfaces of the type Pt(S)[n(1 00) x (1 1 1)1 has been characterized using cyclic voltammetry at different pHs, charge displacement measurements and FT...

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