22 research outputs found
Electrochemical activation of catalysis
No full textSSCI-VIDE+CARE+PVEInternational audienceElectrochemical Promotion of Catalysis (EPOC), also called Non-Faradaic Electrochemical Modification of Catalytic Activity (NEMCA), is a promising concept for boosting catalytic processes and advancing the frontiers of catalysis [1]. This innovative field aims to modify in-operando both the activity and the selectivity of catalysts, in a reversible and controlled manner. EPOC utilizes solid electrolyte materials (ionically conducting ceramics) as catalytic carriers. Ions contained in these electrolytes are electrochemically supplied to the catalyst surface and act as promoting agents to modify the catalyst electronic properties in order to achieve optimal catalytic performance. This lecture will give an overview of recent advances of EPOC for energy conversion.[1] P. Vernoux, L. Lizarraga, M.N. Tsampas, F.M. Sapountzi, A. De Lucas-Consuegra, J.L. Valverde, S. Souentie, C.G. Vayenas, D. Tsiplakides, S. Balomenou, E.A. Baranova, Chem. Rev. 113 (2013) 8192
Electrochemical activation of catalysis
No full textSSCI-VIDE+CARE+PVEInternational audienceElectrochemical Promotion of Catalysis (EPOC), also called Non-Faradaic Electrochemical Modification of Catalytic Activity (NEMCA), is a promising concept for boosting catalytic processes and advancing the frontiers of catalysis [1]. This innovative field aims to modify in-operando both the activity and the selectivity of catalysts, in a reversible and controlled manner. EPOC utilizes solid electrolyte materials (ionically conducting ceramics) as catalytic carriers. Ions contained in these electrolytes are electrochemically supplied to the catalyst surface and act as promoting agents to modify the catalyst electronic properties in order to achieve optimal catalytic performance. This lecture will give an overview of recent advances of EPOC for energy conversion.[1] P. Vernoux, L. Lizarraga, M.N. Tsampas, F.M. Sapountzi, A. De Lucas-Consuegra, J.L. Valverde, S. Souentie, C.G. Vayenas, D. Tsiplakides, S. Balomenou, E.A. Baranova, Chem. Rev. 113 (2013) 8192
The role of Nafion content in sputtered IrO2 based anodes for low temperature PEM water electrolysis
No full textEnhanced performance of CO poisoned proton exchange membrane fuel cells via triode operation
No full textReflection in and on nursing practices- how nurses reflect and develop knowledge and skills during their nursing practice
No full textIntroduction: This paper present some theoretical foundations for reflection and also present some findingsfrom some studies including nurses’ reflections in and on nursing practice in various areas of nursing care.Aims: The aim of this paper was to critically discuss and analyze the application of reflection to nursing practiceand how it could become visible and understandable.Method: A secondary analysis was performed on some studies whereas the author had been involved in. Thissecondary analysis on all data focused on identifying reflection in nursing practice.Results: Data was abstracted and analyzed in order to making reflection in nursing practice visible. The resultsshow that reflection in nursing practice could be identified as reflection on action, reflection in action andreflection as self-discovering. Sometimes the nurses made good caring activities by intuition; they made someactions that they by experiences knew will function, but they had difficulties to verbalize this, in other words;they have what we call silent knowledge.Conclusion: Using reflections can access our theories in use so enabling others to learn. In this way the risk oftaking practice for granted has the potential to be reduced. So what nurses’ do- can be explored and shared –nurses can share and develop knowledge and experiences- nurses will be able to learn from each other as well asfrom ourselves
Role of lattice oxygen in the propane combustion over YSZ-supported nanoparticles and films of Pt
No full textInternational @ AIR+ABO:PVEInternational audienceMetal-Support Interactions (MSI) refers to the effect of the support on the catalytic properties of the supported metal. The phenomenon of Electrochemical Promotion of Catalysis (EPOC) deals with the modification of catalytic activity and selectivity of a catalyst film deposited on a solid electrolyte (ionic conductor) via the application of small electrical potentials or currents. Recent studies on metal-supported catalyst on TiO2 or Yttria-Stabilized Zirconia (YSZ) showed that these two phenomena can be associated with the migration of ionic promoting species containing in the support onto the metallic active sites. These species are responsible for the formation of an effective double layer at the metal-gas interface which affects the binding strength of adsorbed reactants and reaction intermediates. This study reports isotopical labelling experiments during propane oxidation on two different catalytic systems: (a) nanodispersed Pt nanoparticles supported either on ionic conductors (YSZ) or on non-conductive ceramics (ZrO2, SiO2) showing high metallic dispersion and area of triple phase boundary (TPB), (b) Pt catalyst-film deposited on a YSZ membrane (electrochemical catalyst) presenting rather low TPB surface
New onset heart failure in adolescents with inflammatory joint disease treated with TNF-α inhibitors: a case-based review
No full textThe safety of tumor necrosis factor (TNF) inhibitors has been demonstrated for over two decades. However, their effects on cardiovascular function in patients with rheumatic diseases remain controversial, and conclusions are additionally hampered by the cardiovascular complications inherent in such diseases. We present two 15-year-old patients diagnosed with ankylosing spondylitis and juvenile idiopathic arthritis classified as polyarthritis with positive rheumatoid factor, respectively. Soon after treatment onset with adalimumab and etanercept, respectively, they developed myocardial inflammation leading to heart failure. Their condition improved upon treatment discontinuation and onset of secukinumab and tocilizumab, respectively. A thorough literature search revealed that these are the only cases of heart failure reported to date after anti-TNF treatment in adolescents with rheumatic diseases. Although cardiovascular adverse effects seem to be very rare in this population, even atypical symptoms of cardiac failure should not be ignored, and cardiac function should be closely monitored when administering anti-TNF-α. © The Author(s), under exclusive licence to Springer-Verlag GmbH Germany, part of Springer Nature 2024
Role of lattice oxygen in the propane combustion over YSZ-supported nanoparticles and films of Pt
No full textInternational @ AIR+ABO:PVEInternational audienceMetal-Support Interactions (MSI) refers to the effect of the support on the catalytic properties of the supported metal. The phenomenon of Electrochemical Promotion of Catalysis (EPOC) deals with the modification of catalytic activity and selectivity of a catalyst film deposited on a solid electrolyte (ionic conductor) via the application of small electrical potentials or currents. Recent studies on metal-supported catalyst on TiO2 or Yttria-Stabilized Zirconia (YSZ) showed that these two phenomena can be associated with the migration of ionic promoting species containing in the support onto the metallic active sites. These species are responsible for the formation of an effective double layer at the metal-gas interface which affects the binding strength of adsorbed reactants and reaction intermediates. This study reports isotopical labelling experiments during propane oxidation on two different catalytic systems: (a) nanodispersed Pt nanoparticles supported either on ionic conductors (YSZ) or on non-conductive ceramics (ZrO2, SiO2) showing high metallic dispersion and area of triple phase boundary (TPB), (b) Pt catalyst-film deposited on a YSZ membrane (electrochemical catalyst) presenting rather low TPB surface
Role of lattice oxygen in the propane combustion over YSZ-supported nanoparticles and films of Pt
No full textInternational @ AIR+ABO:PVEInternational audienceMetal-Support Interactions (MSI) refers to the effect of the support on the catalytic properties of the supported metal. The phenomenon of Electrochemical Promotion of Catalysis (EPOC) deals with the modification of catalytic activity and selectivity of a catalyst film deposited on a solid electrolyte (ionic conductor) via the application of small electrical potentials or currents. Recent studies on metal-supported catalyst on TiO2 or Yttria-Stabilized Zirconia (YSZ) showed that these two phenomena can be associated with the migration of ionic promoting species containing in the support onto the metallic active sites. These species are responsible for the formation of an effective double layer at the metal-gas interface which affects the binding strength of adsorbed reactants and reaction intermediates. This study reports isotopical labelling experiments during propane oxidation on two different catalytic systems: (a) nanodispersed Pt nanoparticles supported either on ionic conductors (YSZ) or on non-conductive ceramics (ZrO2, SiO2) showing high metallic dispersion and area of triple phase boundary (TPB), (b) Pt catalyst-film deposited on a YSZ membrane (electrochemical catalyst) presenting rather low TPB surface
Hydrogen from electrochemical reforming of C1–C3 alcohols using proton conducting membranes
No full textThis study investigates the production of hydrogen from the electrochemical reforming of short-chain alcohols (methanol, ethanol, iso-propanol) and their mixtures. High surface gas diffusion Pt/C electrodes were interfaced to a Nafion polymeric membrane. The assembly separated the two chambers of an electrochemical reactor, which were filled with anolyte (alcohol�+�H2O or alcohol�+�H2SO4) and catholyte (H2SO4) aqueous solutions. The half-reactions, which take place upon polarization, are the alcohol electrooxidation and the hydrogen evolution reaction at the anode and cathode, respectively. A standard Ag/AgCl reference electrode was introduced for monitoring the individual anodic and cathodic overpotentials. Our results show that roughly 75% of the total potential losses are due to sluggish kinetics of the alcohol electrooxidation reaction. Anodic overpotential becomes larger as the number of C-atoms in the alcohol increases, while a slight dependence on the pH was observed upon changing the acidity of the anolyte solution. In the case of alcohol mixtures, it is the largest alcohol that dictates the overall cell performance
