eng
Iranian Research Organization for Science and Technology (IROST)
Hydrogen, Fuel Cell & Energy Storage
2980-8537
2980-8863
2018-07-01
5
1
1
11
10.22104/ijhfc.2018.2758.1167
663
Preparation of Ni-P-CeO2 electrode and study on electrocatalytic properties for hydrogen evolution reaction
Ali Reza Madram
ar.madram@gmail.com
1
Mehdi Mohebbi
mehdi.mohebbi2011@gmail.com
2
Mohammad Nasiri
mohammadnasiri@yahoo.com
3
Mohammad Reza Sovizi
mrsovizi@yahoo.com
4
Faculty of Chemistry and Chemical Engineering, Malek-Ashtar University of Technology
Department of Applied Chemistry, Malek-Ashtar University of Technology, Isfahan 83145-115, IRAN
Department of Applied Chemistry, Malek-Ashtar University of Technology, Isfahan 83145-115, IRAN
Faculty of Chemistry and Chemical Engineering, Malek-Ashtar University of Technology, Tehran, Iran
In this study ternary Ni-P-CeO2 catalysts were first synthesized by the Co-electrodeposition method on a copper substrate and then characterized by means of microstructural and electrochemical techniques toward a hydrogen evolution reaction (HER). Also, for comparison other catalysts such as Ni-CeO2, Ni-P, and Ni were prepared and characterized by the same methods. The microstructure of the investigated catalysts was characterized by scanning electron microscopy (SEM) coupled with energy dispersive X-ray spectrometry (EDX) and X-ray diffraction (XRD) methods. The electrochemical efficiency of all investigated catalysts was studied based on electrochemical data obtained from electrochemical impedance spectroscopy (EIS) and steady-state polarization Tafel curves in 1 M NaOH solution. The results showed that microstructural properties play an essential role in the high electrocatalytic activity of Ni-P-CeO2. Furthermore, it was observed that the HER mechanism for all investigated systems was Volmer-Heyrovsky with a Volmer step as the rate determining step (RDS). The Ni-P-CeO2 catalyst, as the most active catalyst in this work, was characterized by an exchange current density of j0=168.0 µAcm-2, a Tafel slope of b=-162.0 mV.dec-1, and overpotential at j0=250 mAcm-2; η250=-143.0 mV.
https://hfe.irost.ir/article_663_02ea45f7bccfa3e22d9dfd08443f6109.pdf
Hydrogen evolution reaction (HER)
Ni-P-CeO2
electrocatalytic activity
Electrochemical Impedance Spectroscopy (EIS)
eng
Iranian Research Organization for Science and Technology (IROST)
Hydrogen, Fuel Cell & Energy Storage
2980-8537
2980-8863
2018-08-25
5
1
13
19
10.22104/ijhfc.2018.2909.1174
683
Palladium composite membrane with high reversibility of CO2 poisoning
zeinab darabi
zeinab.darabi89@gmail.com
1
Ali Akbar Babaluo
a.babaluo@sut.ac.ir
2
Sona Jamshidi
s_jamshidi@sut.ac.ir
3
Chemical Engineering Faculty, Sahand University of Technology, Tabriz, Iran
Chemical Engineering Faculty, Sahand University of Technology, Tabriz, Iran
Chemical Engineering Faculty, Islamic Azad University, Tabriz Branch, Iran
A palladium membrane was prepared using the electroless plating technique (ELP) for the separation and purification of hydrogen from a gas mixture. Depending on operating conditions, hydrogen flux from the membrane was in the range of 0.012-0.023 mol.m-2.s-1. The membrane performance in the presence of CO2 was investigated. The results of the GC analysis showed that at a feed concentration of 10% CO2 and a difference pressure of 1-2 bar, no traces of CO2 was observed in the permeate side. However, hydrogen permeation through the membrane decreased due to the occupation of the catalytic active sites by CO2.. At the concentration of 20% CO2 and a difference pressure of 1-2 bar, a peak of methane was detected in the permeate side by the GC analysis, this is related to the diffusion of carbon from the feed side to the permeation side. Study on the topography of the membrane surface showed short height hills and wide valleys on its surface. This topology of the surface conduced high chemical resistance of the membrane, so that the effect of CO2 poisoning was reversible without defect creation on the membrane. Recovery of the poisoned membrane was done by exposing it to hydrogen atmosphere at 500 °C for an hour. The obtained results show that the recovery of hydrogen permeation was up to 99%.
https://hfe.irost.ir/article_683_80881709fc90398066917a7a416c91fe.pdf
Palladium membrane
Electroless plating technique
Poisoning
Membrane recovery
eng
Iranian Research Organization for Science and Technology (IROST)
Hydrogen, Fuel Cell & Energy Storage
2980-8537
2980-8863
2018-09-16
5
1
21
33
10.22104/ijhfc.2018.2867.1170
684
Numerical investigation of methanol crossover through the membrane in a direct methanol fuel cell
Shima Sharifi
shima.sharifi694@gmail.com
1
Rahbar Rahimi
rahimi@hamoon.usb.ac.ir
2
Davood Mohebbi-Kalhori
mohebbik@yahoo.com
3
CAN OZGUR COLPAN
ozgur.colpan@deu.edu.tr
4
Department of Chemical Engineering, Faculty of Engineering, University of Sistan and Baluchestan, Zahedan, Iran
Department of Chemical Engineering, Faculty of Engineering, University of Sistan and Baluchestan, Zahedan, Iran
Department of Chemical Engineering, Faculty of Engineering, University of Sistan and Baluchestan, Zahedan, Iran
Department of Mechanical Engineering, Dokuz Eylul University, Buca, Izmir, 35397, Turkey
A two-dimensional, single-phase, isothermal model has been developed for a direct methanol fuel cell (DMFC). The model considers the anode and cathode electrochemical equations, continuity, momentum and species transport in the entire fuel cell. Then, the equations are coupled together and solved simultaneously using a commercial, finite element based, COMSOL Multiphysics software. The crossover of methanol is also investigated in the model. This model describes the electrochemical kinetics of methanol oxidation at the anode catalyst layer by non-Tafel kinetics. The concentration distribution of methanol, water, and oxygen was predicted by the model. In addition, the changes of methanol crossover and fuel utilization with current density were evaluated for different methanol concentrations (0.5 M, 1 M, 2 M, 4 M, and 6 M). Furthermore, it was also found that the crossover of methanol decreases at low methanol concentrations and high current densities. The results show that the polarization curve is in agreement with experimental data.
https://hfe.irost.ir/article_684_80095b8dae79f14cea216e8dd2035019.pdf
Direct methanol fuel cell
DMFC
Crossover
2D model
Isothermal
eng
Iranian Research Organization for Science and Technology (IROST)
Hydrogen, Fuel Cell & Energy Storage
2980-8537
2980-8863
2018-11-07
5
1
35
47
10.22104/ijhfc.2018.2920.1175
699
Platinum nanoparticles/functionalized carbon nanoparticles composites supported on the carbon-ceramic electrode and their electroactivity for ethanol oxidation
biuck habibi
b.habibi@azaruniv.ac.ir
1
Hamideh Imanzadeh
2
Electroanalytical Chemistry Laboratory, Department of Chemistry, Faculty of Sciences, Azarbaijan Shahid Madani University, Tabriz 53714-161, Iran
Electroanalytical Chemistry Laboratory, Department of Chemistry, Faculty of Sciences, Azarbaijan Shahid Madani University, Tabriz 53714-161, Iran
The electrocatalytic oxidation of ethanol was studied for the platinum nanoparticles/ functionalized carbon nanoparticles composites supported at the carbon-ceramic electrode (PtNPs/tosyl-CNPs/CCE) as an electrocatalyst in acidic medium. The PtNPs/tosyl-CNPs/CCE electrocatalyst was synthesized by electrodeposition of PtNPs on/in casted tosyl-CNPs at the CCE. The characterization of the fabricated nanocomposite was done by X-ray powder diffraction (XRD) spectroscopy, field emission scanning electron microscopy (FE-SEM) and energy-dispersive X-ray (EDX) spectroscopy. The obtained electrocatalytic oxidation of ethanol was studied by cyclic voltammetry and chronoamperometry techniques. The results showed that the PtNPs/tosyl-CNPs/CCE was electrocatalytically more active than PtNPs/CCE and had high anodic peak current densities, low onset potential, low poisoning and high stability. Hence, the proposed nanocomposite, PtNPs/tosyl-CNPs/CCE, can be extended as an attractive and promising electrocatalyst for the ethanol electrooxidation reaction in fuel cells.
https://hfe.irost.ir/article_699_e0c02a87e9607c5bc882f69591ecc160.pdf
Ethanol oxidation
Electrocatalyst
Pt nanoparticles
functionalized carbon nanoparticles
Carbon-ceramic electrode
eng
Iranian Research Organization for Science and Technology (IROST)
Hydrogen, Fuel Cell & Energy Storage
2980-8537
2980-8863
2018-12-29
5
1
49
55
10.22104/ijhfc.2018.2894.1173
723
Electrochemical evaluation of electrodeposited platinum on a modified carbon substrate with cobalt, nickel and copper doped zinc oxide for the methanol oxidation reaction
Rasol abdullah mirzaie
mirzai_r@yahoo.com
1
Azam Anaraki Firooz
a.anaraki@sru.ac.ir
2
Maliheh Bakhtiari
m_bakhtiari1990@yahoo.com
3
Fuel cell research laboratory, Department of Chemistry, Faculty of science, Shahid Rajaee Teacher Training University, Tehran, Iran
Fuel cell research laboratory, Department of Chemistry, Faculty of science, Shahid Rajaee Teacher Training University, Tehran, Iran
Fuel cell research laboratory, Department of Chemistry, Faculty of science, Shahid Rajaee Teacher Training University, Tehran, Iran
Recently, methanol fuel cell systems have been attracted research activities by improving electrocatalysts to investigate facilitating the methanol oxidation reaction. ZnO and ZnO doped with other metals or metal oxide can be used as an additive in carbon substrate of an electrocatalyst to improve electro catalytic properties of a platinum electrocatalyst. In this work, a simple low temperature hydrothermal method has been used for synthesis of different morphologies of 1% mol Ni, Cu and Co doped ZnO nanostructures. The prepared nanostructures were used in carbon substrate of a platinum electrocatalyst on carbon paper. Then platinum was electrodeposited by simple cyclic voltammetry on a modified carbon substrate of electrocatalyst. Prepared electrodes were investigated for methanol oxidation reaction in a three electrode half-cell system by the electrochemical methods like as linear sweep voltammetry. The results revealed that with using Ni doped ZnO in carbon substrate, the current density was increased. While, with using Cu doped ZnO in carbon substrate, a significant reduction in anodic over voltage was observed.
https://hfe.irost.ir/article_723_7bfd0f2b465c2c58c43f908e754c8e31.pdf
Methanol oxidation reaction
Platinum electrodeposition
Electrocatalyst
Doped zinc oxide
carbon substrate
eng
Iranian Research Organization for Science and Technology (IROST)
Hydrogen, Fuel Cell & Energy Storage
2980-8537
2980-8863
2019-03-17
5
1
57
69
10.22104/ijhfc.2019.3158.1178
765
Buckypaper-based catalytic electrode containing graphene nanoplates and ZrO2 nanorod composite to improve PEMFC performance
Maryam Yaldagard
myaldagard@gmail.com
1
Department of Chemical Engineering, Urmia University, Iran
Many researchers proposed the use of graphene nanoplates (GNPs), carbon nanofibers(CNFs) and metal oxide nanorods as an advanced metal catalyst support for electrocatalysis applications. In this research, Platinum (Pt) catalytic electrode was developed by using GNPs and CNFs containing ZrO2 nanorods (buckypaper) as supporting medium and electrodeposition method to deposit Pt catalyst. Special mixed buckypapers (BPs) was developed by layered microstructures with a large porous structures of CNFs networks at the surface, as well as dense and high-conducting GNP networks as back supports. This unique microstructure led to improve Pt catalyst accessibility and mass exchange properties. The topographical features, structure, morphology and composition of the prepared film samples are characterized by AFM, XRD, FESEM and EDX. The thickness of approximately 39micrometer and a porosity of 81%, were obtained by porometer using mercury prosimetry test. Catalytic properties of Pt/BPs electrodes and MEA performance evaluations were measured using potensiostat/galvanostat and fuel cell test station based on cyclic voltammetry and single cell polarization measurements. Pt particles of about 6.66nm were uniformly deposited in porous BPs. A promising electrochemical surface area of 31.66m2g-1 was obtained from these electrodes. The peak power density of the cell worked by BPs with ZrO2 nanorods was 0.288 kWcm-2, higher than 0.23kWcm-2 measured on the cell worked by the BPs without ZrO2 nanorods. A Pt utilization as high as 0.675gPtkW-1 was achieved for the cathode electrode at 80◦C. Pt utilization efficiency can be further improved by optimization of the electrodeposition condition in order to reduce the Pt particle size.
https://hfe.irost.ir/article_765_afc2c0166d2425d3fbb1e0b248a081d5.pdf
Buckypaper electrode
nanofiber
graphene nanoplates
ZrO2 nanorod
PEMFC