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Hernandez-Torres D.,Grenoble Institute of Technology | Hernandez-Torres D.,CNRS GIPSA Laboratory | Riu D.,Grenoble Institute of Technology | Sename O.,CNRS GIPSA Laboratory | Druart F.,Laboratoire Delectrochimie Et Of Physicochimie Des Materiaux Et Des Interfaces
IECON Proceedings (Industrial Electronics Conference) | Year: 2010

In this paper several optimal control strategies are proposed for the power management subsystem of a hybrid fuel cell/supercapacitor power generation system. The control strategies are based on different control configurations involving the power converters associated to the hybrid source. Given certain desired performances, Linear Matrix Inequalities methods are used to solve the controller design problem that is written as an optimization problem with inequalities constraints. The solution to the optimization problem yields a simple PID controller with H ∞ desired performance. For the several control strategies proposed, robustness is a primary issue. Time simulations and robustness analysis shows the effectiveness of the proposed strategies when compared with the classic control strategies used for this type of hybrid power generation system. © 2010 IEEE. Source


Nobrega S.D.,Brazilian Nuclear Energy Research Institute (IPEN) | Fonseca F.C.,Brazilian Nuclear Energy Research Institute (IPEN) | Gelin P.,CNRS Research on Catalysis and Environment in Lyon | Noronha F.B.,Brazilian National Institute of Technology | And 2 more authors.
Energy Procedia | Year: 2012

Electrolyte (yttria-stabilised zirconia, YSZ) supported solid oxide fuel cells (SOFCs) were fabricated using spin coating of standard LSM cathode and Ni-YSZ cermet anode. A ceria-based catalytic layer was deposited onto the anode with a special current collector design. Such a single cell configuration allows operation by gradual internal reforming of direct carbon-containing fuels. First, the fabricated single cells were operated with hydrogen to determine the optimised conditions of fuel concentration and flow rate regarding faradaïc efficiency. Then, the fuel was switched to dry ethanol and the cells were operated for several hours (100 h) with good stability. Post-operation electron microcopy analyses revealed no carbon formation in the anode layer. The results indicate that the gradual internal reforming mechanism is effective, opening up the way to multi-fuel SOFCs, provided that a suitable catalyst layer and cell design are available. © 2012 Published by Elsevier Ltd. Source


Ballesteros J.C.,CIDETEQ | Chainet E.,Laboratoire Delectrochimie Et Of Physicochimie Des Materiaux Et Des Interfaces | Ozil P.,Laboratoire Delectrochimie Et Of Physicochimie Des Materiaux Et Des Interfaces | Meas Y.,CIDETEQ | Trejo G.,CIDETEQ
International Journal of Electrochemical Science | Year: 2011

A thermodynamic study by means of potential-pH (Pourbaix type) and species repartition diagrams is presented in this work with the view to better understand the electrodeposition of copper from non-cyanide alkaline solution containing glycine. The parameters studied were glycine concentration, temperature and scanning rate. The voltametric studies also indicate control by diffusion for the copper electrodeposition. In order to compare the effect of the temperature, we measured the kinetic parameters: charge transfer coefficient (αc) and rate constant (). The morphological study indicated that the temperature plays a role on grain size of the copper coating obtained. X-ray diffraction studies showed that the deposit obtained at 40°C has a crystallite structure, which differs from that found at 25°C. © 2011 by ESG. Source


Ballesteros J.C.,CIDETEQ | Chainet E.,Laboratoire Delectrochimie Et Of Physicochimie Des Materiaux Et Des Interfaces | Ozil P.,Laboratoire Delectrochimie Et Of Physicochimie Des Materiaux Et Des Interfaces | Meas Y.,CIDETEQ | Trejo G.,CIDETEQ
International Journal of Electrochemical Science | Year: 2011

A thermodynamic study of the aqueous copper(II)-tartrate-chloride system is presented in this work with the view to better understand the electrodeposition of copper from a non-cyanide alkaline solution. Additionally, an electrochemical study onto the initial stages of copper electrodeposition on glassy carbon electrode (GCE) is presented in this work. Upon scanning in the negative direction, two cathodic peaks were observed, which are associated with two reduction processes with different energies that involve the same species of copper (II). Analysis of chronoamperograms obtained indicates that the nucleation mechanism involved during the initial stages of Cu deposition is consistent with the model of 3D diffusion-controlled nucleation. The morphological study indicated that the potential plays a role on grain size and shape of the copper coating obtained. Non-linear fitting methods were applied to obtain the growth and nucleation kinetic parameters from theoretical equations proposed to describe this system. © 2011 by ESG. Source


Ballesteros J.C.,CIDETEQ | Ballesteros J.C.,Laboratoire Delectrochimie Et Of Physicochimie Des Materiaux Et Des Interfaces | Chainet E.,Laboratoire Delectrochimie Et Of Physicochimie Des Materiaux Et Des Interfaces | Ozil P.,Laboratoire Delectrochimie Et Of Physicochimie Des Materiaux Et Des Interfaces | And 2 more authors.
Electrochimica Acta | Year: 2011

In this work we present an electrochemical study of the underpotential deposition (UPD) and overpotential deposition (OPD) of zinc onto nickel electrode (NE) from a non-cyanide alkaline solution containing glycine. The studied parameters were zinc concentration, glycine concentration and scanning rate. The analysis of the experimental data clearly showed the presence of UPD and OPD processes that started at -0.8 V vs. SCE and -1.4 V vs. SCE, respectively. The voltammetric studies also indicate diffusion control of the zinc UPD and OPD processes onto the NE. From the potentiostatic transients we found instantaneous nucleation (2D) mechanisms, which agree to that observed in the AFM study. In order to compare the effect of zinc/glycine concentration, we calculate thermodynamic parameters for the OPD process. © 2011 Elsevier Ltd. All rights reserved. Source

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