@article { author = {Rahgoshay, Majid and Rahimi-Esbo, Mazaher and khorshidian, Majid}, title = {Quantitative study of water level control system in PEM fuel cell separator for conservation of reactant gases}, journal = {Hydrogen, Fuel Cell & Energy Storage}, volume = {8}, number = {1}, pages = {1-12}, year = {2021}, publisher = {Iranian Research Organization for Science and Technology (IROST)}, issn = {2980-8537}, eissn = {2980-8863}, doi = {10.22104/ijhfc.2021.4457.1211}, abstract = {One of the products of the interaction between hydrogen and oxygen in a fuel cell is water. The presence of this product can reduce the efficiency of the fuel cell and causes problems in its operation. The present study aims to introduce a water level control system that can prevent the loss of reactant gases, such as hydrogen and oxygen, by improving the process of separation of water from these gases. Thus, unused gases are returned to the fuel cell, and as a result, the costs of using the reactant gases for producing electric power will be reduced. Although the process of a control system has been described qualitatively in previous studies, this paper is intended to quantify this procedure with respect to fuel cell specifications and construction limitations. This system consists of mechanical (venturi) and control units and is designed based on different reactant gases such as air and oxygen. The fuel cell pressure drop and maximum wasted volume of gases when using this system are less than 0.001 bar and 0.5% in each cycle, respectively. This system is simulated based on different fuel cell operating pressures.  }, keywords = {fuel cell,Venturi,Water level control system,Quantitative study,Pressure drop}, url = {https://hfe.irost.ir/article_995.html}, eprint = {https://hfe.irost.ir/article_995_68abf4fcfedc4cb4e6eda3167b3f7c67.pdf} } @article { author = {Yahyanezhad Gele, Maede and Yaghmaei, Soheila and Mardanpour, Mohammad Mahdi}, title = {A comparative study of three types of anode electrodes in a microfluidic microbial fuel cell}, journal = {Hydrogen, Fuel Cell & Energy Storage}, volume = {8}, number = {1}, pages = {13-21}, year = {2021}, publisher = {Iranian Research Organization for Science and Technology (IROST)}, issn = {2980-8537}, eissn = {2980-8863}, doi = {10.22104/ijhfc.2021.4765.1217}, abstract = {Microbial fuel cells (MFCs) are innovative bioelectrochemical approaches for the natural conversion of organic resources into energy based on the metabolic activities of inoculated bacteria that serve as biocatalysts. The main objective of the present study was to examine the effect of zinc foil modified with zinc oxide as a novel anode material to enhance power generation in a microfluidic MFC using oxalate as a substrate. X-ray diffraction and FE-SEM analyses were done for nanostructure confirmation and to understand the morphology of a zinc oxide-coated electrode. The microfluidic MFC performance was investigated and compared with a zinc foil and zinc foil linked stainless steel mesh through an external circuit. The experimental results expressed that the zinc foil, zinc foil externally linked stainless steel, and modified zinc foil as anode electrodes achieved the maximum power density of 2980 W m-3, 1080 W m-3, and 428 W m-3, respectively. The results demonstrated that the zinc oxide nanorods could not act as an effective avenue for improving the microfluidic MFC performance.}, keywords = {microfluidic microbial fuel cell,anode,nanomaterial,oxalate,Shewanella oneidensis MR-1}, url = {https://hfe.irost.ir/article_1008.html}, eprint = {https://hfe.irost.ir/article_1008_978ccba4c3c297059a7ecfa0b693bb7f.pdf} } @article { author = {Farzaneh, Farshid and Golmohammad, Mohammad}, title = {Iranian hydrogen production insight: research trends and outlook}, journal = {Hydrogen, Fuel Cell & Energy Storage}, volume = {8}, number = {1}, pages = {23-33}, year = {2021}, publisher = {Iranian Research Organization for Science and Technology (IROST)}, issn = {2980-8537}, eissn = {2980-8863}, doi = {10.22104/ijhfc.2021.4750.1214}, abstract = {Hydrogen is the best potential candidate to deliver economically reasonable, socially beneficial, and energetically efficient answers to problems associated with the ever-increasing world energy demand and climate change. In this study, different renewable and non-renewable hydrogen production sources and systems are presented comparatively and then partially discussed. Thermal, photonic, biochemical, and electrical are the selected energy sources for hydrogen production. Moreover, the trend of publishing journal articles and registering patents in the field of hydrogen production in Iran and the rest of the world has been presented and compared. The patent registration trend has been markedly upward in recent years. Iranian articles in the field of hydrogen production are categorized based on hydrogen production technology. Due to the vast and affordable sources of fossil fuels, hydrogen production from reforming technology has attracted the most attention. Biomass gasification is another common method of hydrogen production using renewable energy sources.}, keywords = {Hydrogen,Production,renewable,non-renewable,Research trend}, url = {https://hfe.irost.ir/article_1014.html}, eprint = {https://hfe.irost.ir/article_1014_b8473e164ce24236e112ffe7197979ff.pdf} } @article { author = {Molaahmad, Abolfazl and Golmohammad, Mohammad}, title = {Synthesis and characterization of nanostructured Cux (Mn1.5-x/2Co1.5-x/2)O4 as an interconnect coating for solid oxide fuel cell}, journal = {Hydrogen, Fuel Cell & Energy Storage}, volume = {8}, number = {1}, pages = {35-41}, year = {2021}, publisher = {Iranian Research Organization for Science and Technology (IROST)}, issn = {2980-8537}, eissn = {2980-8863}, doi = {10.22104/ijhfc.2021.4791.1220}, abstract = {Manganese-Cobalt Oxide (MCO) spinel oxide is a promising composition as a protective coating for the metallic interconnects of a SOFC. In an effort to reach better properties, such as suitable thermal expansion match, good electrical conductivity, and fine structural stability, various elements have been doped in the spinel structure. In this study, the effect of Cu addition as a dopant on the electrical properties of MCO spinel is investigated. Powders with a nominal composition Cux(Mn1.5-x/2Co1.5-x/2)O4 (x=0, 0.15, and 0.3) were successfully synthesized based on the sol-gel Pechini method. The phase composition and microstructure of the synthesized powder were characterized by X-ray diffraction (XRD) and field emission scanning electron microscopy (FESEM). The XRD results revealed that a pure phase with a spinel structure was obtained for different amounts of doped samples. The microstructural characteristics of the synthesized powders revealed that the average particle size of the powder decreased from about 84nm to 52nm with the introduction of Cu. To evaluate the effect of Cu on the sintering behavior of MCO, the powder was pressed and sintered at 1200°C for 2h. The density measurement and FESEM results showed that the addition of Cu promotes the sintering mechanism, and the density was improved. In addition, the electrical properties of the samples were evaluated using the 2probe direct current technique at different temperatures. The results revealed that the addition of 0.3 Cu increased the electrical conductivity of the sample from 0.102 to 0.218 S.cm-1 at 800°C. This significant improvement can be attributed to the promotion of sintering and also facilitating electron flow by substitution of Cu+2 cations in the spinel structure.}, keywords = {MCO Spine, Sol-ge,,Cu-doped, SOFC interconnect, Electrical conductivity}, url = {https://hfe.irost.ir/article_1016.html}, eprint = {https://hfe.irost.ir/article_1016_5e9954b32eb90981dd1f63846fefe4fe.pdf} } @article { author = {Arjomandbigdeli, Tara and Isapour, Zahra and Malek Khachatourian, Adrine and Golmohammad**, Mohammad}, title = {Synthesis and characterization of Ag-Y co-doped Mn-Co spinel for solid oxide fuel cell application}, journal = {Hydrogen, Fuel Cell & Energy Storage}, volume = {8}, number = {1}, pages = {43-49}, year = {2021}, publisher = {Iranian Research Organization for Science and Technology (IROST)}, issn = {2980-8537}, eissn = {2980-8863}, doi = {10.22104/ijhfc.2021.4764.1215}, abstract = {Mn-Co spinel coating for solid oxide fuel cell interconnects shows a suitable thermal expansion match, acceptable electrical conductivity, and good structural stability. In this paper, the addition of different amounts of Ag and Y as dopants on the physical and electrical properties of the Mn-Co spinel is investigated to improve the coating performance. First, the doped and co-doped powders were successfully synthesized using the Pechini sol-gel method. The synthesized powders were then characterized using X-ray diffraction and field emission scanning electron microscopy. The results confirmed that Ag was not completely doped into the spinel structure and instead acted. as an additive, whereas Y caused Mn3O4 impurity phase formation at higher mol%. Next, the powders were pressed and sintered at different temperatures (950 and 1050 °C) to evaluate the effect of dopants on the sintering and electrical behavior of the samples. Finally, the electrical conductivity of the samples was evaluated using a 2-probe direct current technique. Although results showed that room temperature electrical conductivity increased upon doping, adding Y had a better effect on conductivity than Ag.}, keywords = {Mn-Co spinel,Solid oxide fuel cell,interconnect coating,characterization,doping}, url = {https://hfe.irost.ir/article_1015.html}, eprint = {https://hfe.irost.ir/article_1015_bfe2b8298a2a178d9653bd730034f1d7.pdf} } @article { author = {Ghani Harzand, Ayda and Nemati, Ali and Golmohammad, Mohammad and Malek Khachatourian, Adrine}, title = {Synthesis and electrochemical properties of Sr3Fe1.8Co0.2O7 as a solid oxide fuel cell cathode}, journal = {Hydrogen, Fuel Cell & Energy Storage}, volume = {8}, number = {1}, pages = {51-58}, year = {2021}, publisher = {Iranian Research Organization for Science and Technology (IROST)}, issn = {2980-8537}, eissn = {2980-8863}, doi = {10.22104/ijhfc.2021.4762.1216}, abstract = {Solid oxide fuel cells (SOFCs) have attracted a lot of attention for their high efficiency, fuel flexibility, lower air pollution, etc. Unfortunately, their operating high temperature is the main shortcoming for commercialization. One of the main hurdles to achieving intermediate temperature SOFCs is the conductivity of their cathode materials at lower temperatures.Therefore, in this study, a conductive Sr_3 Fe_1.8 Co_0.2 O_7 cathode material with a Ruddlesden−Popper crystal structure was first successfully synthesized and then the effect of sintering temperature was investigated. X-ray diffraction analysis results revealed that the powder was approximately pure. Moreover, field emission scanning electron microscope (FESEM) micrographs rod-shaped particles with an average particle size of 670 nm. To evaluate the sintering effect on the electrochemical behavior of the synthesized powder, a paste of the powder was painted on both sides of the Gadolinium doped Ceria (CGO) electrolyte and sintered at 1000°C and 1100°C. The electrochemical impedance analysis on symmetrical half-cells revealed that the minimum polarization resistance for the sintered cathode at 1000°C and 1100°C was  1.1 Ω.〖cm〗^2 and 1.6 Ω.〖cm〗^2 at 800֯C. The FESEM micrograph showed High-temperature sintering could affect the interface between CGO and SFCO and decrease transport pathways for oxygen ions conduction at higher sintering temperatures. Also, the electrical conductivity of the sample was determined by the four-point probe electrical conductivity method in the temperature range of 200_800˚C at room atmosphere. The results show that the maximum electrical conductivity at 427°C is 76 S.〖cm〗^(-1).}, keywords = {Solid oxide fuel cell,Electrical conductivity,Electrochemical behavior,Ruddlesden-Popper, cathode}, url = {https://hfe.irost.ir/article_1017.html}, eprint = {https://hfe.irost.ir/article_1017_47e790dcd71d5b50f9040370717002bf.pdf} }