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Electrochemical characterization of MnO_2 as electrocatalytic energy material for fuel cell electrode

燃料化学学报 2015年第3期43卷 344-351页

作者： subir paul Asmita Ghosh Department of Metallurgical and Material Engineering Jadavpur University

Development of inexpensive non Pt based high electrocatalytic energy materials is the need of the hour for fuel cell electrode to produce clean alternative green energy from synthesized bio alcohol using biomass. MnO 2,electro synthesized at different current density is found to be well performed electrocatalytic material,comparable to Pt,with higher current density,very lowovervoltage for the electrochemical oxidation of methanol. From EIS study,the polarization resistance of the coated MnO 2is found to be much lowand electrical double layer capacitance is high,the effect increases with increase in current density of electro deposition. XRD,EDX and AAS analysis confirm the M nO 2deposition. The morphology of SEM images exhibits an enhanced 3D effective substrate area,for electro oxidation of the fuel. A fewnano structured grains of the deposited M nO 2is also observed at higher current density. The fact supports that a high energetic inexpensive electro catalytic material has been found for fuel cell electrode to synthesis renewable energy from methanol fuel.

关键词： electro catalytic energy material fuel cell impedance polarization electro coating

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Electrochemical characterization of Ni-Co and Ni-Co-Fe for oxidation of methyl alcohol fuel with high energetic catalytic surface

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燃料化学学报 2014年第1期42卷 87-95页

作者： subir paul Sk Naimuddin Asmita Ghosh Department of Metallurgical and Material Engineering Jadavpur University

Non Pt based metals and alloys as electrode materials for methyl alcohol fuel cells have been investigated w ith an aim of finding high electrocatalytic surface property for the faster electrode *** w ere fabricated by electrodeposition on pure Al foil,from an electrolyte of Ni,Co,Fe *** optimum condition of electrodeposition w ere found out by a series of experiments,varying the chemistry of the electrolyte,pH valve,temperature,current and cell *** study of the coated Ni-Co or Ni-CoFe alloy on pure Al w as found to exhibit high exchange current density,indicating an improved electro catalytic surface w ith faster charge-discharge reactions at anode and cathode and low *** impedance studies on coated and uncoated surface clearly show ed that the polarization resistance and impedance w ere decreased by Ni-Co or Ni-Co-Fe coating.X-ray diffraction(XRD),energy dispersive X-ray spectroscopy(EDX)and atomic absorption spectroscopy(AAS)studies confirmed the presence of alloying elements and constituents of the *** morphology of the deposits from scanning electron microscope(SEM)images indicated that the electrode surface w as a three dimensional space w hich increased the effective surface area for the electrode reactions to take place.

关键词： electrodeposition Ni-Co alloy electrocatalytic exchange current density impedance X-ray diffraction(XRD) scanning electron microscope(SEM)

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Modeling and computation by artificial neural network of fracture toughness of low alloy steel to study the effect of alloy composition

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International Journal of Modeling, Simulation, and Scientific Computing 2018年第6期9卷 43-56页

作者： subir paul Shibasish Bhattacharjee Department of Metallurgical and Material Engineering Jadavpur University Kolkata India

The unpredictable structure failures of carbon steel and low alloy steel leading to accidents may be caused by the propagation of a flaw or crack already present in the *** toughness which describes the ability of a material containing a crack to resist fracture is one of the most important material properties for design applications of metallic *** this material property is influenced by several parameters,namely material chemistry,heat treatment,morphology of structure,it requires millions of experiments to be conducted to understand and predict ***,mathematical modeling is one of the solutions to find the effect of these parameters and design future ***–intensity factor(KIC)is a quantitative parameter of fracture toughness determining a maximum value of stress which may be applied to a specimen containing a crack(notch)of a certain *** artificial neural network(ANN)model was developed using over 100 sets of data to study the effect of alloying elements on fracture toughness,KIC for the low alloy steel.20%of data was used for training,60%to develop predictive model and rest of the 20%for *** model can predict the fracture toughness of unknown new data close to 80%accuracy which is good enough for statistical *** details of program code with ANN modeling steps have been *** of fracture toughness by the model with variation of alloy composition as well as yield stress gives interesting and important information which may help in designing alloy which will resist crack propagation in a structure and hence enhance the life of structure to fail.

关键词： Stress-intensity factor fracture toughness low alloy steel alloying elements ANN modeling prediction

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Synthesis and characterization of ZnO-Al_2O_3 oxides as energetic electro-catalytic material for glucose fuel cell

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燃料化学学报 2015年第8期43卷 1004-1010页

作者： Sujit Kumar Guchhait subir paul Metallurgical and Material Engineering Department Jadavpur University

One of the thrust areas of research is to find an alternative fuel to meet the increasing demand for *** is a good source of alternative fuel for clean energy and is easily available in abundance from both naturally occurring plants and industrial *** oxidation of glucose in fuel cell requires high electro-catalytic surface of the electrode to produce the clean electrical energy w ith minimum energy losses in the *** and Pt based alloys exhibit high electro-catalytic properties but they are *** energy synthesis at economically cheap price,non Pt based inexpensive high electro catalytic material is *** synthesized Zn O-Al2O3composite is found to exhibit high electro-catalytic properties for glucose *** Cyclic Voltammetry and Chronoamperometry curves reflect that the material is very much comparable to Pt as far as the maximum current and the steady state current delivered from the glucose oxidation are *** image confirms the mixed oxide *** images morphology show increased 3D surface areas at higher *** attributed high current delivered from electrochemical oxidation of glucose on this electrode surface.

关键词： glucose energy materials electro-catalyst cyclic voltammetry chronoamperometry polarization

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