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In this paper, the optimal and safe operation of a hybrid power system based on a fuel cell system and renewable energy sources is analyzed. The needed DC power resulting from the power flow balance on the DC bus is ensured by the FC system via the air regulator or the fuel regulator controlled by the power-tracking control reference or both regulators using a switched mode of the above-mentioned reference. The optimal operation of a fuel cell system is ensured by a search for the maximum of multicriteria-based optimization functions focused on fuel economy under perturbation, such as variable renewable energy and dynamic load on the DC bus. Two search controllers based on the global extremum seeking scheme are involved in this search via the remaining fueling regulator and the boost DC–DC converter. Thus, the fuel economy strategies based on the control of the air regulator and the fuel regulator, respectively, on the control of both fueling regulators are analyzed in this study. The fuel savings compared to fuel consumed using the static feed-forward control are 6.63%, 4.36% and 13.72%, respectively, under dynamic load but without renewable power. With renewable power, the needed fuel cell power on the DC bus is lower, so the fuel cell system operates more efficiently. These percentages are increased to 7.28%, 4.94% and 14.97%.
Nicu Bizon; Mircea Raceanu; Emmanouel Koudoumas; Adriana Marinoiu; Emmanuel Karapidakis; Elena Carcadea. Renewable/Fuel Cell Hybrid Power System Operation Using Two Search Controllers of the Optimal Power Needed on the DC Bus. Energies 2020, 13, 6111 .
AMA StyleNicu Bizon, Mircea Raceanu, Emmanouel Koudoumas, Adriana Marinoiu, Emmanuel Karapidakis, Elena Carcadea. Renewable/Fuel Cell Hybrid Power System Operation Using Two Search Controllers of the Optimal Power Needed on the DC Bus. Energies. 2020; 13 (22):6111.
Chicago/Turabian StyleNicu Bizon; Mircea Raceanu; Emmanouel Koudoumas; Adriana Marinoiu; Emmanuel Karapidakis; Elena Carcadea. 2020. "Renewable/Fuel Cell Hybrid Power System Operation Using Two Search Controllers of the Optimal Power Needed on the DC Bus." Energies 13, no. 22: 6111.
The commonly used electrode Pt supported on a carbon (Pt/C) catalyst has demonstrated underperforming electrochemical durability in proton exchange membrane fuel cell (PEMFC) harsh operation conditions, especially in terms of Pt electrochemical instability and carbon corrosion. Gold nanoparticles (AuNPs) are considered one of the best alternative catalysts of PtNPs due to their remarkable selectivity for oxygen reduction reaction (ORR) and electrochemical stability in strong acid conditions, attributes which are ideal for practical PEMFC applications. In this work, we propose a new, facile and low-cost approach to prepare AuNPs supported on reduced graphene oxide nanocompounds (AuNPs/rGO). The morphological and structural properties of the as-prepared AuNPs/rGO were studied using various microscopic and spectroscopic techniques, namely, Raman Spectroscopy, Scanning Electron Microscopy (SEM), Scanning Transmission Electron Microscopy (STEM), X-Ray Diffraction (XRD), Fourier Transform Infrared Spectroscopy (FTIR), specific surface area (Brunauer–Emmett–Teller, BET). A mesoporous structure with narrow pore size distribution centered at 2 nm approximately, where the pores are regular and interconnected was successfully fabricated. The prepared catalyst was exposed to an accelerated stress test (potential cycles between −0.8 and +0.2 in KOH 1 M solution). The voltammetric stability test indicated a slight degradation after 1500 cycles. The electrochemical stability was assigned to the combined effect of AuNPs formed during chemical synthesis and to graphene oxide support.
Oana-Andreea Lazar; Adriana Marinoiu; Mircea Raceanu; Aida Pantazi; Geanina Mihai; Mihai Varlam; Marius Enachescu. Reduced Graphene Oxide Decorated with Dispersed Gold Nanoparticles: Preparation, Characterization and Electrochemical Evaluation for Oxygen Reduction Reaction. Energies 2020, 13, 4307 .
AMA StyleOana-Andreea Lazar, Adriana Marinoiu, Mircea Raceanu, Aida Pantazi, Geanina Mihai, Mihai Varlam, Marius Enachescu. Reduced Graphene Oxide Decorated with Dispersed Gold Nanoparticles: Preparation, Characterization and Electrochemical Evaluation for Oxygen Reduction Reaction. Energies. 2020; 13 (17):4307.
Chicago/Turabian StyleOana-Andreea Lazar; Adriana Marinoiu; Mircea Raceanu; Aida Pantazi; Geanina Mihai; Mihai Varlam; Marius Enachescu. 2020. "Reduced Graphene Oxide Decorated with Dispersed Gold Nanoparticles: Preparation, Characterization and Electrochemical Evaluation for Oxygen Reduction Reaction." Energies 13, no. 17: 4307.
Electrospun fibers with different concentrations of polyacrylonitrile (PAN) were synthesized and the results are reported in this study. The aim was to obtain carbon nanofibers for manufacturing gas diffusion layers for proton exchange membrane (PEM) fuel cells. The electrospun fibers obtained were carbonized at 1200 °C, 1300 °C, and 1400 °C, in order to have nanofibers with more than 96% of carbon atoms. The scanning electron microscopy (SEM) results revealed an increase in the diameter from 400–700 nm at 1200 °C to 1000–1400 nm at 1300 °C and 1400 °C. The Raman measurements disclose a higher degree of crystallinity for the sample carbonized at elevated temperatures. The surface area was estimated from the Brunauer–Emmett–Teller (BET) method and the results revealed an increase from 40.69 m2g−1 to 66.89 m2g−1 and 89.92 m2g−1 as the carbonization temperature increased. Simultaneously, the pore volume increased with increasing carbonization temperature. The Fourier-transform infrared spectroscopy (FTIR) spectra reveal that during carbonization treatment, C≡N triple bonds are destroyed with the appearance of C=N double bonds. Decreasing the ID/IG intensities’ ratio from ~1.07 to ~1.00 denotes the defects reduction in carbonaceous materials due to the graphitization process. Therefore, the carbon fibers developed in optimum conditions are appropriate to be further used to produce gas diffusion layers for Proton-exchange membrane fuel cells (PEMFC).
Radu Dorin Andrei; Adriana Marinoiu; Elena Marin; Stanica Enache; Elena Carcadea. Carbon Nanofibers Production via the Electrospinning Process. Energies 2020, 13, 3029 .
AMA StyleRadu Dorin Andrei, Adriana Marinoiu, Elena Marin, Stanica Enache, Elena Carcadea. Carbon Nanofibers Production via the Electrospinning Process. Energies. 2020; 13 (11):3029.
Chicago/Turabian StyleRadu Dorin Andrei; Adriana Marinoiu; Elena Marin; Stanica Enache; Elena Carcadea. 2020. "Carbon Nanofibers Production via the Electrospinning Process." Energies 13, no. 11: 3029.
Here in, we describe an ultrafast, single-step microwave irradiation route (MW) to prepare graphene supported Pt nanoparticles, during which the small Pt nanoparticles are distributed uniformly on a reduced graphene oxide surface. This route provides evident advantages namely low cost, easiness, low time consuming and high yield in comparison to actual chemical methods to develop efficient Pt/rGO catalyst with Pt content close to state-of-the-art commercial composition. The structure and composition of prepared samples have been studied by specific techniques, while the electrocatalytic stability has been studied using ex-situ and in-situ measurements. High performance and electrochemically stable catalyst for PEM fuel cells was developed using the sample with highest loading and good dispersion. The fabricated Pt-rGO-based MEA was investigated for durability under fuel starvation in comparison with commercial Pt/C-based MEA. The electrocatalytic activity was investigated and the electrochemical response revealed the higher stability during accelerated degradation test under fuel starvation in comparison with commercial Pt/C. This study promotes the applicability of described preparation method to noble or transition metal nanoparticles embedded on graphene-based materials.
Adriana Marinoiu; Elena Carcadea; Ada Sacca; Alessandra Carbone; Claudia Sisu; Andreea Dogaru; Mircea Raceanu; Mihai Varlam. One-step synthesis of graphene supported platinum nanoparticles as electrocatalyst for PEM fuel cells. International Journal of Hydrogen Energy 2020, 46, 12242 -12253.
AMA StyleAdriana Marinoiu, Elena Carcadea, Ada Sacca, Alessandra Carbone, Claudia Sisu, Andreea Dogaru, Mircea Raceanu, Mihai Varlam. One-step synthesis of graphene supported platinum nanoparticles as electrocatalyst for PEM fuel cells. International Journal of Hydrogen Energy. 2020; 46 (22):12242-12253.
Chicago/Turabian StyleAdriana Marinoiu; Elena Carcadea; Ada Sacca; Alessandra Carbone; Claudia Sisu; Andreea Dogaru; Mircea Raceanu; Mihai Varlam. 2020. "One-step synthesis of graphene supported platinum nanoparticles as electrocatalyst for PEM fuel cells." International Journal of Hydrogen Energy 46, no. 22: 12242-12253.
Chitosan-sulfated titania composite membranes were prepared, characterized, and evaluated for potential application as polymer electrolyte membranes. To improve the chemical stability, the membranes were cross-linked using sulfuric acid, pentasodium triphosphate, and epoxy-terminated polydimethylsiloxane. Differences in membranes’ structure, thickness, morphology, mechanical, and thermal properties prior and after cross-linking reactions were evaluated. Membranes’ water uptake capacities and their chemical stability in Fenton reagent were also studied. As proved by dielectric spectroscopy, the conductivity strongly depends on cross-linker nature and on hydration state of membranes. The most encouraging results were obtained for the chitosan-sulfated titania membrane cross-linked with sulfuric acid. This hydrated membrane attained values of proton conductivity of 1.1 × 10−3 S/cm and 6.2 × 10−3 S/cm, as determined at 60 °C by dielectric spectroscopy and the four-probes method, respectively.
Andra-Cristina Humelnicu; Petrisor Samoila; Mihai Asandulesa; Corneliu Cojocaru; Adrian Bele; Adriana T. Marinoiu; Ada Sacca; Valeria Harabagiu. Chitosan-Sulfated Titania Composite Membranes with Potential Applications in Fuel Cell: Influence of Cross-Linker Nature. Polymers 2020, 12, 1125 .
AMA StyleAndra-Cristina Humelnicu, Petrisor Samoila, Mihai Asandulesa, Corneliu Cojocaru, Adrian Bele, Adriana T. Marinoiu, Ada Sacca, Valeria Harabagiu. Chitosan-Sulfated Titania Composite Membranes with Potential Applications in Fuel Cell: Influence of Cross-Linker Nature. Polymers. 2020; 12 (5):1125.
Chicago/Turabian StyleAndra-Cristina Humelnicu; Petrisor Samoila; Mihai Asandulesa; Corneliu Cojocaru; Adrian Bele; Adriana T. Marinoiu; Ada Sacca; Valeria Harabagiu. 2020. "Chitosan-Sulfated Titania Composite Membranes with Potential Applications in Fuel Cell: Influence of Cross-Linker Nature." Polymers 12, no. 5: 1125.
New Energy Storage and Hydrogen Technologies Cryogenic Technologies Material Science for Energy and Environment Isotopes in Environmental Studies and Life Quality Applications
Irina Petreanu; National Research and Development Institute for Cryogenics and Isotopic Technologies; Claudia Sisu; Amalia Soare; Radu Dorin Andrei; Catalin Capris; Adriana Marinoiu. Preparation of the Ni doped carbon nanofibers synthesized by electrospinning. SMART ENERGY AND SUSTAINABLE ENVIRONMENT 2020, 23, 5 -12.
AMA StyleIrina Petreanu, National Research and Development Institute for Cryogenics and Isotopic Technologies, Claudia Sisu, Amalia Soare, Radu Dorin Andrei, Catalin Capris, Adriana Marinoiu. Preparation of the Ni doped carbon nanofibers synthesized by electrospinning. SMART ENERGY AND SUSTAINABLE ENVIRONMENT. 2020; 23 (1):5-12.
Chicago/Turabian StyleIrina Petreanu; National Research and Development Institute for Cryogenics and Isotopic Technologies; Claudia Sisu; Amalia Soare; Radu Dorin Andrei; Catalin Capris; Adriana Marinoiu. 2020. "Preparation of the Ni doped carbon nanofibers synthesized by electrospinning." SMART ENERGY AND SUSTAINABLE ENVIRONMENT 23, no. 1: 5-12.
We have prepared a highly efficient and stable platinum–cobalt catalyst supported on graphene oxide by using a one-step synthesis microwave-irradiation process. The structure and composition of two different compositions (Pt:Co(2.5:1)/rGO, Pt:Co(2:1)/rGO) have been investigated by Fourier infrared spectroscopy (FT-IR), X-ray Photoelectron spectroscopy (XPS), specific surface area (BET), Raman spectroscopy. Their electrocatalytic activity was investigated and the electrochemical response from cyclic voltammetry revealed the high efficiency and stability as well as the potential application as cathode electrode. The electrocatalysts exhibited a superior durability comparing with commercial Pt/C catalyst after accelerated stress test, indicating a lower loss of electrochemical surface area in the case of prepared samples. Moreover, this study extends the applicability of this synthesis method for the preparation of other noble or transitional metal nanoparticles decorated on reduced graphene oxide.
Adriana Marinoiu; Mircea Raceanu; Elena Carcadea; Mindaugas Andrulevicius; Asta Tamuleviciene; Tomas Tamulevicius; Catalin Capris; Mihai Varlam. Efficient method to obtain Platinum–Cobalt supported on graphene oxide and electrocatalyst development. International Journal of Hydrogen Energy 2020, 45, 26226 -26237.
AMA StyleAdriana Marinoiu, Mircea Raceanu, Elena Carcadea, Mindaugas Andrulevicius, Asta Tamuleviciene, Tomas Tamulevicius, Catalin Capris, Mihai Varlam. Efficient method to obtain Platinum–Cobalt supported on graphene oxide and electrocatalyst development. International Journal of Hydrogen Energy. 2020; 45 (49):26226-26237.
Chicago/Turabian StyleAdriana Marinoiu; Mircea Raceanu; Elena Carcadea; Mindaugas Andrulevicius; Asta Tamuleviciene; Tomas Tamulevicius; Catalin Capris; Mihai Varlam. 2020. "Efficient method to obtain Platinum–Cobalt supported on graphene oxide and electrocatalyst development." International Journal of Hydrogen Energy 45, no. 49: 26226-26237.
A facile approach for preparation of gold nanoparticles decorated on reduced graphene oxide (AuNPs/rGO) in mild reaction conditions is described. Several microscopic and spectroscopic techniques (SEM, FTIR, XPS) have been connected with structural investigation (BET) in order to confirm the successful synthesis of AuNPs/rGO nanocomposites. The end application of AuNPs/rGO in proton exchange membrane fuel cells (PEMFC) has been considered as innovative nanomaterial for oxygen reduction reaction (ORR). In this respect, the electrochemical techniques were involved for a comprehensive in-situ characterization of developed ORR catalysts, in particular the durability has been assessed in order to evaluate the long-term performance. The structural characteristics and their synergistic effects could not only improve the ions and electrons transportation but also enhance the electrochemical stability in acid medium specific for PEMFC. The electrode containing AuNPs/rGO presented superior electrochemical performances as along with the long-term stability, demonstrating a considerable potential as efficient ORR catalytic material.
Adriana Marinoiu; Mindaugas Andrulevicius; Asta Tamuleviciene; Tomas Tamulevicius; Mircea Raceanu; Mihai Varlam. Synthesis of well dispersed gold nanoparticles on reduced graphene oxide and application in PEM fuel cells. Applied Surface Science 2019, 504, 144511 .
AMA StyleAdriana Marinoiu, Mindaugas Andrulevicius, Asta Tamuleviciene, Tomas Tamulevicius, Mircea Raceanu, Mihai Varlam. Synthesis of well dispersed gold nanoparticles on reduced graphene oxide and application in PEM fuel cells. Applied Surface Science. 2019; 504 ():144511.
Chicago/Turabian StyleAdriana Marinoiu; Mindaugas Andrulevicius; Asta Tamuleviciene; Tomas Tamulevicius; Mircea Raceanu; Mihai Varlam. 2019. "Synthesis of well dispersed gold nanoparticles on reduced graphene oxide and application in PEM fuel cells." Applied Surface Science 504, no. : 144511.
In this work, gold nanoparticles decorated on reduced graphene oxide (Au/rGOs) samples were synthesized by employing the eco-friendly microwave-assisted process (MW). This rapid process has proven to be a viable and trustworthy new method for Au/rGOs preparation ensuring the simultaneous reduction of GO and obtaining of Au nanoparticles through a simple and facile one-step reaction in aqueous solution. The structure and morphology of prepared Au/rGOs were characterized using scanning electron microscopy (SEM), Raman spectroscopy, BET surface area. These analyses revealed good phase stability and distinct morphology. The as-prepared Au/rGO was involved in developing of a new membrane electrode assembly (MEA) and in-situ tested in long-time operation of PEMFC. The electrochemical stability of the innovative cathode was evaluated using an accelerated stress test (AST) - cycling potential protocol. The performed aggressive AST demonstrated excellent stability, thus we report an ORR electrocatalyst with enhanced durability. Moreover, this study extends the method applicability in respect to the preparation of other noble metal nanoparticles decorated on reduced graphene oxide.
Adriana Marinoiu; Mindaugas Andrulevicius; Asta Tamuleviciene; Tomas Tamulevicius; Elena Carcadea; Mircea Raceanu; Mihai Varlam. High performance catalytic system with enhanced durability in PEM fuel cell. International Journal of Hydrogen Energy 2019, 45, 10409 -10422.
AMA StyleAdriana Marinoiu, Mindaugas Andrulevicius, Asta Tamuleviciene, Tomas Tamulevicius, Elena Carcadea, Mircea Raceanu, Mihai Varlam. High performance catalytic system with enhanced durability in PEM fuel cell. International Journal of Hydrogen Energy. 2019; 45 (17):10409-10422.
Chicago/Turabian StyleAdriana Marinoiu; Mindaugas Andrulevicius; Asta Tamuleviciene; Tomas Tamulevicius; Elena Carcadea; Mircea Raceanu; Mihai Varlam. 2019. "High performance catalytic system with enhanced durability in PEM fuel cell." International Journal of Hydrogen Energy 45, no. 17: 10409-10422.
A numerical model for a PEM fuel cell has been developed and used to investigate the effect of some of the key parameters of the porous layers of the fuel cell (GDL and MPL) on its performance. The model is comprehensive as it is three-dimensional, multiphase and non-isothermal and it has been well-validated with the experimental data of a 5 cm2 active area-fuel cell with/without MPLs. As a result of the reduced mass transport resistance of the gaseous and liquid flow, a better performance was achieved when he GDL thickness was decreased. For the same reason, the fuel cell was shown to be significantly improved with increasing the GDL porosity by a factor of 2 and the consumption of oxygen doubled when increasing the porosity from 0.40 to 0.78. Compared to the conventional constant-porosity GDL, the graded-porosity (gradually decreasing from the flow channel to the catalyst layer) GDL was found to enhance the fuel cell performance and this is due to the better liquid water rejection. The incorporation of a realistic value for the contact resistance between the GDL and the bipolar plate slightly decreases the performance of the fuel cell. Also the results show that the addition of the MPL to the GDL is crucially important as it assists in the humidifying of the electrolyte membrane, thus improving the overall performance of the fuel cell. Finally, realistically increasing the MPL contact angle has led to a positive influence on the fuel cell performance.
Elena Carcadea; Mihai Varlam; Mohammed Ismail; Derek Binns Ingham; Adriana Marinoiu; Mircea Raceanu; Catalin Jianu; Laurentiu Patularu; Daniela Ion-Ebrasu. PEM fuel cell performance improvement through numerical optimization of the parameters of the porous layers. International Journal of Hydrogen Energy 2019, 45, 7968 -7980.
AMA StyleElena Carcadea, Mihai Varlam, Mohammed Ismail, Derek Binns Ingham, Adriana Marinoiu, Mircea Raceanu, Catalin Jianu, Laurentiu Patularu, Daniela Ion-Ebrasu. PEM fuel cell performance improvement through numerical optimization of the parameters of the porous layers. International Journal of Hydrogen Energy. 2019; 45 (14):7968-7980.
Chicago/Turabian StyleElena Carcadea; Mihai Varlam; Mohammed Ismail; Derek Binns Ingham; Adriana Marinoiu; Mircea Raceanu; Catalin Jianu; Laurentiu Patularu; Daniela Ion-Ebrasu. 2019. "PEM fuel cell performance improvement through numerical optimization of the parameters of the porous layers." International Journal of Hydrogen Energy 45, no. 14: 7968-7980.
Adriana Marinoiu; M. Raceanu; Elena Carcadea; M. Varlam; I. Stefanescu. Iodinated carbon materials for oxygen reduction reaction in proton exchange membrane fuel cell. Scalable synthesis and electrochemical performances. Arabian Journal of Chemistry 2019, 12, 868 -880.
AMA StyleAdriana Marinoiu, M. Raceanu, Elena Carcadea, M. Varlam, I. Stefanescu. Iodinated carbon materials for oxygen reduction reaction in proton exchange membrane fuel cell. Scalable synthesis and electrochemical performances. Arabian Journal of Chemistry. 2019; 12 (6):868-880.
Chicago/Turabian StyleAdriana Marinoiu; M. Raceanu; Elena Carcadea; M. Varlam; I. Stefanescu. 2019. "Iodinated carbon materials for oxygen reduction reaction in proton exchange membrane fuel cell. Scalable synthesis and electrochemical performances." Arabian Journal of Chemistry 12, no. 6: 868-880.
A facile and feasible protocol for synthesis of functionalized reduced graphene oxide decorated with gold nanoparticles (AuNP/rGO) in mild reaction conditions has been successfully developed. Starting from graphite, the following synthesis routes were developed: 1) preparation of graphite oxide; 2) graphene oxide (GO) functionalized with a compatible polymer; 3) reduced graphene oxide decorated with gold nanoparticles (final compound). The surface morphology of as-prepared AuNP/rGO was investigated using scanning electron microscopy (SEM) and specific surface area was determined using BET method, while structural properties were investigated using Raman scattering spectroscopy, X-Ray photoelectron spectroscopy (XPS), Fourier-transform infrared spectroscopy (FTIR). This comprehensive study demonstrated the simultaneous reduction of GO and the achievement of Au nanoparticles dispersed on graphene sheets. An ORR catalytic system containing prepared AuNP/rGO was developed, and electrochemical measurements were performed. Firstly, the ex-situ electrochemical performances of AuNP/rGO-modified carbon electrode were investigated using cyclic voltammetry. Secondly, the in-situ electrochemical evaluation were carried out as application in real PEM fuel cell and analyzed as comparison commercial Pt/C versus developed ORR catalytic system. The in-situ CV results showed that the oxidation and reduction peaks corresponding to hydrogen adsorption/desorption decreased differently, indicating that a decrease of electrochemical surface area occurs for both cases, more visible for commercial catalyst. The cathode made with AuNP/rGO developed in this work, tested in hydrogen-air PEMFC, had a power density of 0.59 W cm − 2 at 0.6 V, a meaningful voltage for fuel cells operation, comparable with that of a commercial Pt-based cathode tested under identical conditions, but a superior electrochemical stability. The results confirmed that the developed AuNP/rGO nanoparticles could be valuable alternative ORR nanostructured electrodes.
Adriana Marinoiu; Mircea Raceanu; Mindaugas Andrulevicius; Asta Tamuleviciene; Tomas Tamulevicius; Simona Nica; Daniela Bala; Mihai Varlam. Low-cost preparation method of well dispersed gold nanoparticles on reduced graphene oxide and electrocatalytic stability in PEM fuel cell. Arabian Journal of Chemistry 2018, 13, 3585 -3600.
AMA StyleAdriana Marinoiu, Mircea Raceanu, Mindaugas Andrulevicius, Asta Tamuleviciene, Tomas Tamulevicius, Simona Nica, Daniela Bala, Mihai Varlam. Low-cost preparation method of well dispersed gold nanoparticles on reduced graphene oxide and electrocatalytic stability in PEM fuel cell. Arabian Journal of Chemistry. 2018; 13 (1):3585-3600.
Chicago/Turabian StyleAdriana Marinoiu; Mircea Raceanu; Mindaugas Andrulevicius; Asta Tamuleviciene; Tomas Tamulevicius; Simona Nica; Daniela Bala; Mihai Varlam. 2018. "Low-cost preparation method of well dispersed gold nanoparticles on reduced graphene oxide and electrocatalytic stability in PEM fuel cell." Arabian Journal of Chemistry 13, no. 1: 3585-3600.
The catalytic separation of hydrogen isotopes is of particular interest for nuclear industry from the point of view of tritium recovery and its use in fusion reactors. Isotopic exchange may take place in the homogeneous (gaseous) phase or in the heterogeneous phase (hydrogen or gaseous deuterium and water or liquid heavy water). Catalysts are necessary both for the homogeneous phase reaction and the heterogeneous reaction. Recently, graphene and graphene oxides have been investigated as support material due to their excellent physical and chemical properties. The high specific surface, their thermal and chemical stability, high mechanical strength make graphene a potential component in the development of new catalysts that could be used in isotopic exchange. The use of graphene and graphene oxides as support for the active metal has shown an improvement in catalytic activity when compared to the conventional support, degasolination carbon. This behavior may be explained by the high dispersion of active metal on the surface of graphene. The paper presents the preparation of the catalysts that will be used in the future catalytic isotopic exchange experiments (first vapor phase catalytic exchange - VPCE column in order to understand its efficiency in isotopic exchange then the catalysts will be integrated into a liquid phase catalytic exchange LPCE - type laboratory installation and results of BET, SEM and XRD analysis for the prepared powder Pt/graphene oxide and commercial Pt/C in order to highlight the characteristics of the new material. It also shows TGA results for Pt/graphene oxide/PTFE in order to compare the thermal stability of the new prepared catalyst with the previous one.
Felicia Vasut; Anisoara Oubraham; Amalia Maria Soare; Adriana Marinoiu; Daniela Ion-Ebrasu; Mirela Dragan. Platinum supported on graphene - PTFE as catalysts for isotopic exchange in a detritiation plant. Fusion Engineering and Design 2018, 146, 149 -152.
AMA StyleFelicia Vasut, Anisoara Oubraham, Amalia Maria Soare, Adriana Marinoiu, Daniela Ion-Ebrasu, Mirela Dragan. Platinum supported on graphene - PTFE as catalysts for isotopic exchange in a detritiation plant. Fusion Engineering and Design. 2018; 146 ():149-152.
Chicago/Turabian StyleFelicia Vasut; Anisoara Oubraham; Amalia Maria Soare; Adriana Marinoiu; Daniela Ion-Ebrasu; Mirela Dragan. 2018. "Platinum supported on graphene - PTFE as catalysts for isotopic exchange in a detritiation plant." Fusion Engineering and Design 146, no. : 149-152.
Metal-dispersed nanoparticles on reduced graphene oxide as catalyst for oxygen reduction reaction (ORR) demonstrate promising applications in the energy sector. The catalyst activity enhancement and stability improvement investigated in this study are mandatory steps in obtaining feasible electrodes for PEMFC. The chapter deals with the synthesis of noble metal catalysts including platinum and gold nanoparticles dispersed on reduced graphene oxide (PtNPs/rGO and AuNPs/rGrO). The understanding of the correlations between the electrochemical activity on one side and the structure, composition and synthesis method on the other side are provided. Facile routes in order to prepare the well dispersed PtNPs/rGO and AuNPs/rGrO are included. The structure and morphology were characterized by different techniques, namely X-ray diffraction (XRD), Scanning Transmission Electron Microscopy (STEM), specific surface area measurements. In this context we report a hybrid derived electrocatalyst with increased electrochemical active area and enhanced mass-transport properties. The electrochemical performances of PtNPs/rGO and AuNPs/rGrO were tested and compared with a standard PEMFC configuration. The performed electrochemical characterization recommends the prepared materials as ORR electrocatalysts for the further fabrication of cathodes for PEM fuel cells. The research directions as well as perspectives on the subsequent development of more active and less expensive electrocatalysts are established.
Adriana Marinoiu; Mircea Raceanu; Elena Carcadea; Aida Pantazi; Raluca Mesterca; Oana Tutunaru; Simona Nica; Daniela Bala; Mihai Varlam; Marius Enachescu. Noble Metal Dispersed on Reduced Graphene Oxide and Its Application in PEM Fuel Cells. Electrocatalysts for Fuel Cells and Hydrogen Evolution - Theory to Design 2018, 1 .
AMA StyleAdriana Marinoiu, Mircea Raceanu, Elena Carcadea, Aida Pantazi, Raluca Mesterca, Oana Tutunaru, Simona Nica, Daniela Bala, Mihai Varlam, Marius Enachescu. Noble Metal Dispersed on Reduced Graphene Oxide and Its Application in PEM Fuel Cells. Electrocatalysts for Fuel Cells and Hydrogen Evolution - Theory to Design. 2018; ():1.
Chicago/Turabian StyleAdriana Marinoiu; Mircea Raceanu; Elena Carcadea; Aida Pantazi; Raluca Mesterca; Oana Tutunaru; Simona Nica; Daniela Bala; Mihai Varlam; Marius Enachescu. 2018. "Noble Metal Dispersed on Reduced Graphene Oxide and Its Application in PEM Fuel Cells." Electrocatalysts for Fuel Cells and Hydrogen Evolution - Theory to Design , no. : 1.
Irina Petreanu; Adriana Marinoiu; Claudia Sisu; Mihai Varlam; Radu Claudiu Fierascu; Paul Stanescu; Mircea Teodorescu. Corrigendum to “Synthesis and testing of a composite membrane based on sulfonated polyphenylene oxide and silica compounds as proton exchange membrane for PEM fuel cells” Mater. Res. Bull., 96, (December (Part 3)), (2017), 136–142. Materials Research Bulletin 2018, 108, 281 .
AMA StyleIrina Petreanu, Adriana Marinoiu, Claudia Sisu, Mihai Varlam, Radu Claudiu Fierascu, Paul Stanescu, Mircea Teodorescu. Corrigendum to “Synthesis and testing of a composite membrane based on sulfonated polyphenylene oxide and silica compounds as proton exchange membrane for PEM fuel cells” Mater. Res. Bull., 96, (December (Part 3)), (2017), 136–142. Materials Research Bulletin. 2018; 108 ():281.
Chicago/Turabian StyleIrina Petreanu; Adriana Marinoiu; Claudia Sisu; Mihai Varlam; Radu Claudiu Fierascu; Paul Stanescu; Mircea Teodorescu. 2018. "Corrigendum to “Synthesis and testing of a composite membrane based on sulfonated polyphenylene oxide and silica compounds as proton exchange membrane for PEM fuel cells” Mater. Res. Bull., 96, (December (Part 3)), (2017), 136–142." Materials Research Bulletin 108, no. : 281.
Adriana Marinoiu; Mircea Raceanu; Elena Carcadea; Mihai Varlam. Iodine-doped graphene – Catalyst layer in PEM fuel cells. Applied Surface Science 2018, 456, 238 -245.
AMA StyleAdriana Marinoiu, Mircea Raceanu, Elena Carcadea, Mihai Varlam. Iodine-doped graphene – Catalyst layer in PEM fuel cells. Applied Surface Science. 2018; 456 ():238-245.
Chicago/Turabian StyleAdriana Marinoiu; Mircea Raceanu; Elena Carcadea; Mihai Varlam. 2018. "Iodine-doped graphene – Catalyst layer in PEM fuel cells." Applied Surface Science 456, no. : 238-245.
Adriana Marinoiu; Elena Carcadea; Mircea Raceanu; Mihai Varlam. Iodine Doped Graphene for Enhanced Electrocatalytic Oxygen Reduction Reaction in PEM Fuel Cell Applications. Advances In Hydrogen Generation Technologies 2018, 1 .
AMA StyleAdriana Marinoiu, Elena Carcadea, Mircea Raceanu, Mihai Varlam. Iodine Doped Graphene for Enhanced Electrocatalytic Oxygen Reduction Reaction in PEM Fuel Cell Applications. Advances In Hydrogen Generation Technologies. 2018; ():1.
Chicago/Turabian StyleAdriana Marinoiu; Elena Carcadea; Mircea Raceanu; Mihai Varlam. 2018. "Iodine Doped Graphene for Enhanced Electrocatalytic Oxygen Reduction Reaction in PEM Fuel Cell Applications." Advances In Hydrogen Generation Technologies , no. : 1.
Low cost, sustainable and high performance electrocatalysts for oxygen reduction reaction (ORR) which can replace/reduce rare metals base catalysts are highly desirable for the effective commercial development of fuel cells. In this paper, we report a class of low cost electrocatalyst with highly performance for ORR, obtained by graphene doping with iodine precursor. It can be one of the most promising alternatives to Pt-based catalysts to date. Iodine doped graphene based materials were prepared by nucleophilic substitution and characterized by different techniques, including Scanning Electron Microscopy SEM, wavelength dispersive X-ray fluorescence WDXRF, that revealed the structure and morphology. The iodinated graphene was sprayed on gas diffusion layer (GDL) and tested in a single cell PEMFC. The electrochemical performances of fuel cell with/without iodinated graphene under typical experimental conditions were evaluated, namely current-voltage polarization and cyclic voltammetry curves, electrochemical impedance spectroscopy (EIS).
Adriana Marinoiu; Mihai Varlam; Elena Carcadea; Mircea Raceanu; Amalia Soare; Ioan Stefanescu. A Class of High Performance Electrocatalysts for Oxygen Reduction Reaction of Fuel Cells, using Iodine Doped Graphene. Materials Today: Proceedings 2018, 5, 15915 -15922.
AMA StyleAdriana Marinoiu, Mihai Varlam, Elena Carcadea, Mircea Raceanu, Amalia Soare, Ioan Stefanescu. A Class of High Performance Electrocatalysts for Oxygen Reduction Reaction of Fuel Cells, using Iodine Doped Graphene. Materials Today: Proceedings. 2018; 5 (8):15915-15922.
Chicago/Turabian StyleAdriana Marinoiu; Mihai Varlam; Elena Carcadea; Mircea Raceanu; Amalia Soare; Ioan Stefanescu. 2018. "A Class of High Performance Electrocatalysts for Oxygen Reduction Reaction of Fuel Cells, using Iodine Doped Graphene." Materials Today: Proceedings 5, no. 8: 15915-15922.
A comprehensive 3D, multiphase, and nonisothermal model for a proton exchange membrane fuel cell has been developed in this study. The model has been used to investigate the effects of the size of the parallel‐type cathode flow channel on the fuel cell performance. The flow‐field plate, with the numerically predicted best performing cathode flow channel, has been built and experimentally tested using an in‐house fuel cell test station. The effects of the operating conditions of relative humidity, pressure, and temperature have also been studied. The results have shown that the fuel cell performs better as the size of the cathode flow channel decreases, and this is due to the increased velocity that assists in removing liquid water that may hinder the transport of oxygen to the cathode catalyst layer. Further, the modelled fuel cell was found to perform better with increasing pressure, increasing temperature, and decreasing relative humidity; the respective results have been presented and discussed. Finally, the agreement between the modelling and the experimentally data of the best performing cathode flow channel was found to be very good.
Elena Carcadea; Mihai Varlam; Derek B. Ingham; Mohammed Ismail; Laurentiu Patularu; Adriana Marinoiu; Dorin Schitea. The effects of cathode flow channel size and operating conditions on PEM fuel performance: A CFD modelling study and experimental demonstration. International Journal of Energy Research 2018, 42, 2789 -2804.
AMA StyleElena Carcadea, Mihai Varlam, Derek B. Ingham, Mohammed Ismail, Laurentiu Patularu, Adriana Marinoiu, Dorin Schitea. The effects of cathode flow channel size and operating conditions on PEM fuel performance: A CFD modelling study and experimental demonstration. International Journal of Energy Research. 2018; 42 (8):2789-2804.
Chicago/Turabian StyleElena Carcadea; Mihai Varlam; Derek B. Ingham; Mohammed Ismail; Laurentiu Patularu; Adriana Marinoiu; Dorin Schitea. 2018. "The effects of cathode flow channel size and operating conditions on PEM fuel performance: A CFD modelling study and experimental demonstration." International Journal of Energy Research 42, no. 8: 2789-2804.
Irina Petreanu; Adriana Marinoiu; Claudia Sisu; Mihai Varlam; Radu Fierascu; Paul Stanescu; Mircea Teodorescu. Synthesis and testing of a composite membrane based on sulfonated polyphenylene oxide and silica compounds as proton exchange membrane for PEM fuel cells. Materials Research Bulletin 2017, 96, 136 -142.
AMA StyleIrina Petreanu, Adriana Marinoiu, Claudia Sisu, Mihai Varlam, Radu Fierascu, Paul Stanescu, Mircea Teodorescu. Synthesis and testing of a composite membrane based on sulfonated polyphenylene oxide and silica compounds as proton exchange membrane for PEM fuel cells. Materials Research Bulletin. 2017; 96 ():136-142.
Chicago/Turabian StyleIrina Petreanu; Adriana Marinoiu; Claudia Sisu; Mihai Varlam; Radu Fierascu; Paul Stanescu; Mircea Teodorescu. 2017. "Synthesis and testing of a composite membrane based on sulfonated polyphenylene oxide and silica compounds as proton exchange membrane for PEM fuel cells." Materials Research Bulletin 96, no. : 136-142.