Technical University Del Estado Of Guerrero

Taxco de Alarcón, Mexico

Technical University Del Estado Of Guerrero

Taxco de Alarcón, Mexico

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Thanikaikarasan S.,Applied Scientific Research | Mahalingam T.,Karunya University | Veeramuthumari S.,Applied Scientific Research | Ixtlilco L.,Technical University Del Estado Of Guerrero
Journal of New Materials for Electrochemical Systems | Year: 2013

Growth of lead sulphide thin films has been carried out electrochemically on indium doped tin oxide coated conducting glass substrates from an aqueous acidic bath containing Pb(CH3COO)2 and Na 2S2O3. X-ray diffraction pattern showed that the deposited films possess cubic structure with most prominent reflection along (200) plane. The dependency of microstructural parameters such as crystallite size, strain and dislocation density with film thickness has been analyzed. Surface morphology and film composition have been analyzed using scanning electron microscopy and energy dispersive analysis by X-rays. Optical absorption analysis showed that the prepared films possess a direct band gap value of 0.37 eV. © J. New Mat. Electrochem. Systems.


Vijila J.J.J.,Manonmaniam Sundaranar University | Mohanraj K.,Manonmaniam Sundaranar University | Thanikaikarasan S.,Applied Scientific Research | Sivakumar G.,Annamalai University | And 2 more authors.
Journal of New Materials for Electrochemical Systems | Year: 2016

Thin films of CuSbS2 have been deposited on ultrasonically cleaned glass substrates using a simple chemical bath deposition technique. Prepared films have been characterized using X-ray diffraction, Field Emission Scanning Electron Microscopy and UV-Vis-NIR spectroscopic techniques, respectively. X-ray diffraction analysis revealed that the prepared films possess polycrystalline in nature with orthorhombic CuSbS2 in addition to secondary phase of monoclinic Cu3SbS3 and cubic Cu12Sb4S13 for different copper concentrations. Field Emission Scanning Electron Spectroscopic analysis showed that the prepared films possess spherical shaped grains with irregular shaped clusters. Optical absorption analysis showed that the prepared films possess band gap value in the range between 1.7 and 2.4 eV. © J. New Mat. Electrochem. Systems.


Hernandez Galvez G.,Centro del Cambio Global y la Sustentabilidad en el Sureste | Dorrego Portela J.R.,Istmo University of Mexico | Nunez Rodriguez A.,Istmo University of Mexico | Lastres Danguillecourt O.,Istmo University of Mexico | And 4 more authors.
International Journal of Energy Research | Year: 2014

This study presents a selection of optimal energy alternatives for electrical self-sufficiency in a rural university (Universidad del Istmo, UNISTMO), located in the state of Oaxaca, Mexico and for the electricity supply for a rural community (Gran Piedra) in Santiago, Cuba. The analysis follows a multicriteria approach. It uses a method called compromise programming and takes into account the technical, economical, environmental and social criteria. The hybrid optimization model for electric renewables (HOMER) software was used to generate alternative energy sets through enumerative search, with which decisional matrices were built for each case study. The influence of weighting for each criterion was assessed. In the case of self-sufficiency in UNISTMO, when the decision-making center has a preference for the minimization of equivalent emissions in the life cycle (ESLC), a wind system is suitable. On the other hand, when there is a preference for the minimization of levelized cost of energy, a photovoltaic (PV) system is suitable; both systems connected to the national electrical grid. Obviously, a preference for the minimization of capital cost led to keeping the power supply from the grid. In the case of Gran Piedra, a diesel generator-based system is suitable when the criterion 'capital cost' absorbs 70% or more of the preferences of the decision-making centers. When the preference is less than 70% regardless of the weighting given to other criteria, the best alternatives are those involving renewable technologies, reaching renewable fractions of 75% and 94% in two potential configurations of energetic systems. © 2013 John Wiley & Sons, Ltd.


Bharathi B.,Applied Scientific Research | Thanikaikarasan S.,Applied Scientific Research | Kollu P.,Indian Institute of Technology Bombay | Chandrasekar P.V.,Fuzhou University | And 2 more authors.
Journal of New Materials for Electrochemical Systems | Year: 2014

Thin films of NiO have been prepared using potentiostatic electrodeposition technique from an aqueous electrolytic bath containing NiSO4. Deposited films have been characterized using x-ray diffraction, scanning electron microscopy and energy dispersive analysis by x-rays. X-ray diffraction patterns showed that the prepared films possess polycrystalline nature with face centered cubic structure. Surface morphology and film composition showed that films with better stoichiometry and smooth surface are obtained at optimized growth condition. Optical absorption analysis showed that the prepared films possess direct band gap value around 3.46 eV.


Bharathi B.,Applied Scientific Research | Thanikaikarasan S.,Applied Scientific Research | Chandrasekar P.V.,Fuzhou University | Kollu P.,Indian Institute of Technology Bombay | And 2 more authors.
Journal of New Materials for Electrochemical Systems | Year: 2014

Thin films of NiS have been deposited on indium doped tin oxide coated conducting glass substrates using electrodeposition technique. Structural studies revealed that the deposited films exhibit hexagonal structure with preferential orientation along (002) plane. Structural parameters such as crystallite size, strain and dislocation density are calculated for films with different thickness values obtained at various deposition time. The film composition and surface morphology have been analyzed using scanning electron microscopy and energy dispersive analysis by X-rays. Optical absorption analysis showed that the deposited films possess band gap value around 0.7 eV.


Martinez L.,Autonomous University of Mexico State | Becerra D.,Technical University Del Estado Of Guerrero | Agarwal V.,Autonomous University of Mexico State
Superlattices and Microstructures | Year: 2016

The performance of memristive devices has been investigated as a function of annealing temperature of zinc oxide (ZnO) thin films over porous silicon (PSi) in dual layer configuration. Electrical characterization demonstrates that nanostructured PSi substrate as well as ZnO layer configuration contributes effectively to an enhancement of the memristive ratio by a factor of 8. The effect of single and differently annealed double layer configuration of ZnO-PS produces continuous and abrupt switching respectively. Endurance test reveals a decrease in the switching ratio with an increase in the step size. © 2016 Elsevier Ltd.


Rivera M.A.,Technical University Del Estado Of Guerrero | Gamboa S.A.,National Autonomous University of Mexico | Sebastian P.J.,Technical University Del Estado Of Guerrero
Journal of New Materials for Electrochemical Systems | Year: 2012

Nickel and palladium nanoparticles were obtained by colloidal dispersion. Chemical reduction was used to obtain good quality nanoparticles showing electrocatalytic characteristics for improving the electrochemical hydrogen content in typical metal hydride at the initial stage of absorption process. The particle size and distribution of the colloidal nanoparticles were calculated by analyzing TEM images. The colloidal nanoparticles obtained were impregnated onto LaN i5-xM x type metal hydride alloy via catalytic dipping. The impregnated metal hydride alloy was characterized by SEM, AFM and EDS to obtain quasi-quantitative measurements of the position and concentration of the agglomerated colloidal nanoparticles forming nano-clusters onto de surface of the metal hydride alloy. Electrochemical characterization showed the enhancement of absorbed hydrogen content in the metal hydride due to the presence of agglomerated nanoparticles and the localized catalytic activity of Pd more than that of Ni nano-clusters. © J. New Mat. Electrochem. Systems.


Rivera M.A.,Technical University Del Estado Of Guerrero | Gamboa S.A.,National Autonomous University of Mexico | Sebastian P.J.,National Autonomous University of Mexico
International Journal of Energy Research | Year: 2012

In this work are present the results obtained from the electrochemical characterization of a metal hydride type MmNi 5-XM X impregnated with palladium, palladium-nickel and nickel nanoparticles as catalytic precursors for hydrogen absorption. The hydrogen absorption was investigated in the charge/discharge mechanism of a metal hydride via electrochemical process. The complete study involved the analysis of linear and anodic polarization, charge/discharge cycles, the application of an electrochemical model and electrochemical impedance spectroscopy to investigate the amount of hydrogen absorbed as a function of the catalytic precursors. The use of Pd nanoparticles showed the best results as catalytic precursor to absorb more hydrogen than other precursor systems. © 2011 John Wiley & Sons, Ltd.


Martinez O.S.,National Autonomous University of Mexico | Martinez O.S.,Technical University Del Estado Of Guerrero | Millan A.R.,National Autonomous University of Mexico | Huerta L.,National Autonomous University of Mexico | And 5 more authors.
Materials Chemistry and Physics | Year: 2012

Thin films of Cd 1-xMg xTe with band gap in the range of 1.6-1.96 eV were deposited by vacuum coevaporation of CdTe and Mg on glass substrates heated at 300 °C. Different experimental techniques such as XRD, UV-vis spectroscopy, SEM, and XPS were used to study the effect of Mg incorporation into the lattice of CdTe. The band gap of the films showed a clear tendency to increase as the Mg content in the film is increased. The Cd 1-xMg xTe films maintain all the structural characteristics of the CdTe, however, diminishing of intensity for the XRD patterns is observed due to both change in preferential orientation and change in atomic scattering due to the incorporation of Mg. SEM images showed significant evidences of morphological changes due to the presence of Mg. XRD, UV-vis spectroscopy, and XPS data confirmed the incorporation of Mg in the lattice of CdTe. The significant increase in band gap of CdTe due to incorporation of Mg suggests that the Cd 1-xMg xTe thin film is a candidate material to use as absorber layer in the top-cell of a tandem solar cell. © 2011 Elsevier B.V. All rights reserved.


Davila-Jimenez M.M.,Autonomous University of Puebla | Elizalde-Gonzalez M.P.,Autonomous University of Puebla | Garcia-Diaz E.,Autonomous University of Puebla | Gonzalez-Perea M.,Autonomous University of Puebla | And 2 more authors.
Adsorption Science and Technology | Year: 2014

In this study, we measured the adsorption of Basic Blue 41 (BB41) dye on a maize cob adsorbent and on two model adsorbents (cellulose triacetate and cellulose acetate propionate). The experimental adsorption data were evaluated with the isotherm equations of Langmuir, Freundlich, Langmuir-Freundlich and Dubinin-Radushkevich, and constants were obtained exclusively by non-linear regression. In order to select the optimal isotherm equation, Akaike information criterion was used. The celluloses obeyed the Langmuir isotherm in the temperature range tested, whereas the corncob followed the Freundlich equation. This comparative study shows that limited amounts of the cationic dye were adsorbed on the model celluloses than on the cob. BB41 was neither adsorbed horizontally nor vertically onto the cob, whereas it competed with water molecules and despite saturation, did not exhaustively occupy the surface of the celluloses. The Gibbs free energy of adsorption was evaluated using the equilibrium constants obtained by several procedures and the results were found to be inconsistent.

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