Iranian Research Organization for Science and Technology (IROST)
Hydrogen, Fuel Cell & Energy Storage
2980-8537
2980-8863
5
1
2018
07
01
Preparation of Ni-P-CeO2 electrode and study on electrocatalytic properties for hydrogen evolution reaction
1
11
EN
Ali Reza
Madram
Faculty of Chemistry and Chemical Engineering, Malek-Ashtar University of Technology
ar.madram@gmail.com
Mehdi
Mohebbi
Department of Applied Chemistry, Malek-Ashtar University of Technology, Isfahan 83145-115, IRAN
mehdi.mohebbi2011@gmail.com
Mohammad
Nasiri
Department of Applied Chemistry, Malek-Ashtar University of Technology, Isfahan 83145-115, IRAN
mohammadnasiri@yahoo.com
Mohammad Reza
Sovizi
Faculty of Chemistry and Chemical Engineering, Malek-Ashtar University of Technology, Tehran, Iran
mrsovizi@yahoo.com
10.22104/ijhfc.2018.2758.1167
In this study ternary Ni-P-CeO<sub>2</sub> 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-CeO<sub>2</sub>, 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-CeO<sub>2</sub>. 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-CeO<sub>2 </sub>catalyst, as the most active catalyst in this work, was characterized by an exchange current density of j<sub>0</sub>=168.0 µAcm<sup>-2</sup>, a Tafel slope of b=-162.0 mV.dec<sup>-1</sup>, and overpotential at j<sub>0</sub>=250 mAcm<sup>-2</sup>; η<sub>250</sub>=-143.0 mV.
Hydrogen evolution reaction (HER),Ni-P-CeO2,electrocatalytic activity,Electrochemical Impedance Spectroscopy (EIS)
https://hfe.irost.ir/article_663.html
https://hfe.irost.ir/article_663_02ea45f7bccfa3e22d9dfd08443f6109.pdf
Iranian Research Organization for Science and Technology (IROST)
Hydrogen, Fuel Cell & Energy Storage
2980-8537
2980-8863
5
1
2018
08
25
Palladium composite membrane with high reversibility of CO2 poisoning
13
19
EN
zeinab
darabi
Chemical Engineering Faculty, Sahand University of Technology, Tabriz, Iran
zeinab.darabi89@gmail.com
Ali Akbar
Babaluo
Chemical Engineering Faculty, Sahand University of Technology, Tabriz, Iran
a.babaluo@sut.ac.ir
Sona
Jamshidi
Chemical Engineering Faculty, Islamic Azad University, Tabriz Branch, Iran
s_jamshidi@sut.ac.ir
10.22104/ijhfc.2018.2909.1174
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<sup>-2</sup>.s<sup>-1</sup>. The membrane performance in the presence of CO<sub>2</sub> was investigated. The results of the GC analysis showed that at a feed concentration of 10% CO<sub>2</sub> and a difference pressure of 1-2 bar, no traces of CO<sub>2</sub> was observed in the permeate side. However, hydrogen permeation through the membrane decreased due to the occupation of the catalytic active sites by CO<sub>2</sub>.. At the concentration of 20% CO<sub>2</sub> 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 CO<sub>2</sub> 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%.
Palladium membrane,Electroless plating technique,Poisoning,Membrane recovery
https://hfe.irost.ir/article_683.html
https://hfe.irost.ir/article_683_80881709fc90398066917a7a416c91fe.pdf
Iranian Research Organization for Science and Technology (IROST)
Hydrogen, Fuel Cell & Energy Storage
2980-8537
2980-8863
5
1
2018
09
16
Numerical investigation of methanol crossover through the membrane in a direct methanol fuel cell
21
33
EN
Shima
Sharifi
Department of Chemical Engineering, Faculty of Engineering, University of Sistan and Baluchestan, Zahedan, Iran
shima.sharifi694@gmail.com
Rahbar
Rahimi
0000-0002-0133-4980
Department of Chemical Engineering, Faculty of Engineering, University of Sistan and Baluchestan, Zahedan, Iran
rahimi@hamoon.usb.ac.ir
Davood
Mohebbi-Kalhori
Department of Chemical Engineering, Faculty of Engineering, University of Sistan and Baluchestan, Zahedan, Iran
mohebbik@yahoo.com
CAN OZGUR
COLPAN
Department of Mechanical Engineering, Dokuz Eylul University,
Buca, Izmir, 35397, Turkey
ozgur.colpan@deu.edu.tr
10.22104/ijhfc.2018.2867.1170
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.
Direct methanol fuel cell,DMFC,Crossover,2D model,Isothermal
https://hfe.irost.ir/article_684.html
https://hfe.irost.ir/article_684_80095b8dae79f14cea216e8dd2035019.pdf
Iranian Research Organization for Science and Technology (IROST)
Hydrogen, Fuel Cell & Energy Storage
2980-8537
2980-8863
5
1
2018
11
07
Platinum nanoparticles/functionalized carbon nanoparticles composites supported on the carbon-ceramic electrode and their electroactivity for ethanol oxidation
35
47
EN
biuck
habibi
Electroanalytical Chemistry Laboratory, Department of Chemistry, Faculty of Sciences, Azarbaijan Shahid Madani University, Tabriz 53714-161, Iran
b.habibi@azaruniv.ac.ir
Hamideh
Imanzadeh
Electroanalytical Chemistry Laboratory, Department of Chemistry, Faculty of Sciences, Azarbaijan Shahid Madani University, Tabriz 53714-161, Iran
10.22104/ijhfc.2018.2920.1175
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.
Ethanol oxidation,Electrocatalyst,Pt nanoparticles,functionalized carbon nanoparticles,Carbon-ceramic electrode
https://hfe.irost.ir/article_699.html
https://hfe.irost.ir/article_699_e0c02a87e9607c5bc882f69591ecc160.pdf
Iranian Research Organization for Science and Technology (IROST)
Hydrogen, Fuel Cell & Energy Storage
2980-8537
2980-8863
5
1
2018
12
29
Electrochemical evaluation of electrodeposited platinum on a modified carbon substrate with cobalt, nickel and copper doped zinc oxide for the methanol oxidation reaction
49
55
EN
Rasol
abdullah mirzaie
Fuel cell research laboratory, Department of Chemistry, Faculty of science, Shahid Rajaee Teacher Training University, Tehran, Iran
mirzai_r@yahoo.com
Azam
Anaraki Firooz
Fuel cell research laboratory, Department of Chemistry, Faculty of science, Shahid Rajaee Teacher Training University, Tehran, Iran
a.anaraki@sru.ac.ir
Maliheh
Bakhtiari
Fuel cell research laboratory, Department of Chemistry, Faculty of science, Shahid Rajaee Teacher Training University, Tehran, Iran
m_bakhtiari1990@yahoo.com
10.22104/ijhfc.2018.2894.1173
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.
Methanol oxidation reaction,Platinum electrodeposition,Electrocatalyst,Doped zinc oxide,carbon substrate
https://hfe.irost.ir/article_723.html
https://hfe.irost.ir/article_723_7bfd0f2b465c2c58c43f908e754c8e31.pdf
Iranian Research Organization for Science and Technology (IROST)
Hydrogen, Fuel Cell & Energy Storage
2980-8537
2980-8863
5
1
2019
03
17
Buckypaper-based catalytic electrode containing graphene nanoplates and ZrO2 nanorod composite to improve PEMFC performance
57
69
EN
Maryam
Yaldagard
Department of Chemical Engineering, Urmia University, Iran
myaldagard@gmail.com
10.22104/ijhfc.2019.3158.1178
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 ZrO<sub>2</sub> 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 31.66m<sup>2</sup>g<sup>-1</sup> was obtained from these electrodes. The peak power density of the cell worked by BPs with ZrO<sub>2</sub> nanorods was 0.288 kWcm<sup>-2</sup>, higher than 0.23kWcm<sup>-2</sup> measured on the cell worked by the BPs without ZrO<sub>2</sub> nanorods. A Pt utilization as high as 0.675gPtkW<sup>-1</sup> 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.
Buckypaper electrode,nanofiber,graphene nanoplates,ZrO2 nanorod,PEMFC
https://hfe.irost.ir/article_765.html
https://hfe.irost.ir/article_765_afc2c0166d2425d3fbb1e0b248a081d5.pdf