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Radenka Maric - One of the best experts on this subject based on the ideXlab platform.
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Characterization and evaluation of Fe–N–C electrocatalysts for oxygen reduction directly synthesized by reactive spray Deposition Technology
Journal of Materials Science, 2020Co-Authors: Abhinav Poozhikunnath, Leonard Bonville, Timothy Myles, Haoran Yu, Radenka MaricAbstract:A novel method for synthesizing iron–nitrogen–carbon (Fe–N–C) electrocatalysts using a modified flame spray pyrolysis technique called reactive spray Deposition Technology (RSDT) is described. The physicochemical properties of the RSDT-synthesized catalyst are quantified through a series of experiments including nitrogen adsorption, electron microscopy, thermogravimetry, spectroscopy and electrochemical analysis with the overall aim of exploring opportunities to use RSDT as a single-step, scalable alternative to multi-step, energy-intensive furnace-based methods for synthesizing PGM-free electrocatalysts for oxygen reduction. The Fe–N–C is synthesized by pyrolyzing a liquid solution precursor mixture under oxygen lean conditions without the use of additional support material or heat treatment steps. Properties of critical importance to the performance of the Fe–N–C catalyst are discussed in detail with respect to properties of similar catalysts synthesized by multi-step methods reported in the literature. Materials characterization shows evidence of ORR active Fe–N_ x sites, a high fraction of pyridinic nitrogen and carbon-encapsulated iron-rich particles. The existence of undesired amorphous carbon mixed with the catalytically active material is also observed and may require process development in future to remove. Rotating disk electrode analysis in alkaline media of the RSDT-synthesized Fe–N–C confirmed catalytic activity toward oxygen reduction, which is shown to follow a two-step reaction mechanism. While the activity of the Fe–N–C catalyst is lower than that of commercial Pt/C, it shows superior stability with a decrease in half-wave potential of only 5 mV after 4000 cycles in alkaline media, encouraging further investigation of this alternative flame-based synthesis route.
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Low Pt Thin Cathode Layer Catalyst Layer by Reactive Spray Deposition Technology
Fuel Cell Seminar and Exposition, 2019Co-Authors: Radenka Maric, Roberto Neagu, Justin Roller, Khalid Fatih, Adam TuckAbstract:National Research Council Canada's Institute for Fuel Cell Innovation, NRC-IFCI, has been developing the Reactive Spray Deposition Technology (RSDT) process to optimize composite electrode layer formation and develop novel electrocatalysts and catalyst layers. The RSDT process provides the means necessary to develop the next generation of thin, low platinum or alloy catalyst layers for PEM MEA's. In order to best manage water distribution, mass transport and conductivity, the structure should be a gradient with controlled porosity and controlled distribution of both platinum and ionomer across the catalyst layer. The RSDT process allows good control of the platinum particle size as they are created directly from metal vapors, which prevents agglomeration in the catalyst layer. Additionally, it has the flexibility to build a gradient layer structure across a very thin film catalyst layer (
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Thin Film Low Temperature Solid Oxide Fuel Cell (LTSOFC) by Reactive Spray Deposition Technology (RSDT)
ECS Transactions, 2019Co-Authors: Radenka Maric, Dai Nishijima, Keizo Furusaki, Roberto NeaguAbstract:The present work describes the effect on the performance of a SOFC when a Gd 0.2Ce 0.8O 1.9 (GDC) layer is introduced as diffusion barrier layer between the yttria stabilized zirconia (YSZ) electrolyte and the La 0.6Sr 0.4Co 1-xFe xO 3-\u3b4 (LSCF) cathode of an anode supported cell with Ni-YSZ anode. The dense, thin and fully crystalline GDC films were directly applied by RSDT, without any post-Deposition heating or sintering steps. The quality of the film and performance of the cell prepared by Reactive Spray Deposition Technology (RSDT) was compared to a GDC blocking layer deposited by screen printing (SP) and then sintered at 1000\ub0C. By applying RSDT to deposit the GDC-barrier layer onto the YSZ electrolyte a lower ohmic resistance was obtained for the RSDT deposited cell vs. the SP cell. The lower resistance can be attributed to the well crystallized, thin and dense GDC layer deposited at 900\ub0C. \ua9The Electrochemical Society.Peer reviewed: YesNRC publication: Ye
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One-Step Synthesis of Co 3 O 4 Thin Film by Reactive Spray Deposition Technology for Efficient Electrochemical Water Splitting
MRS Advances, 2018Co-Authors: Yang Wang, Junkai He, Radenka MaricAbstract:ABSTRACTEfficient catalysts for the oxygen evolution reaction (OER) are widely applied in fuel cells and rechargeable lithium air batteries. It is desirable but challenging to achieve comparable activity to that of the noble-metal catalyst with non-precious metal catalyst. Highly active Co3O4 thin film electrodes have been successfully synthesized by a rapid one-step flame combustion synthesis method called Reactive Spray Deposition Technology. X-ray diffraction confirms the absence of any impurity phase with this synthesis process. The detailed morphology of the Co3O4 thin film is investigated with scanning electron microscopy and transmission electron microscopy. Cyclic voltammetry is used to investigate the redox activity of Co3+ to Co4+ which is crucial for the OER performance. The as-prepared Co3O4 catalyst demonstrates promising activity for OER, with an overpotential of 399 mV (at 10 mA cm-2) for OER.
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Synthesis and Characterization of Nano-crystalline La2Zr2O7 Film by Reactive Spray Deposition Technology for Application in Thermal Barrier Coatings
MRS Advances, 2017Co-Authors: Yang Wang, Justin Roller, Rishi Kumar, Radenka MaricAbstract:AbstractLanthanum zirconate (La2Zr2O7) nano-crystalline films with cubic structure have been successfully prepared by a facile synthesis approach called reactive spray Deposition Technology (RSDT). La2Zr2O7 nanoparticles are produced by combusting a precursor solution of lanthanum acetylacetonate hydrate and zirconium acetylacetonate dissolved in an organic solvent mixture. The nanoparticles formed during the combustion process are directly deposited onto the substrate. The composition and microstructure of the as-deposited films are extensively characterized by X-ray diffraction (XRD), scanning electron microscope (SEM) and transmission electron microscope (TEM). The thermal diffusivities of the films are investigated by the means of laser flash method.
Roberto Neagu - One of the best experts on this subject based on the ideXlab platform.
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Low Pt Thin Cathode Layer Catalyst Layer by Reactive Spray Deposition Technology
Fuel Cell Seminar and Exposition, 2019Co-Authors: Radenka Maric, Roberto Neagu, Justin Roller, Khalid Fatih, Adam TuckAbstract:National Research Council Canada's Institute for Fuel Cell Innovation, NRC-IFCI, has been developing the Reactive Spray Deposition Technology (RSDT) process to optimize composite electrode layer formation and develop novel electrocatalysts and catalyst layers. The RSDT process provides the means necessary to develop the next generation of thin, low platinum or alloy catalyst layers for PEM MEA's. In order to best manage water distribution, mass transport and conductivity, the structure should be a gradient with controlled porosity and controlled distribution of both platinum and ionomer across the catalyst layer. The RSDT process allows good control of the platinum particle size as they are created directly from metal vapors, which prevents agglomeration in the catalyst layer. Additionally, it has the flexibility to build a gradient layer structure across a very thin film catalyst layer (
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Thin Film Low Temperature Solid Oxide Fuel Cell (LTSOFC) by Reactive Spray Deposition Technology (RSDT)
ECS Transactions, 2019Co-Authors: Radenka Maric, Dai Nishijima, Keizo Furusaki, Roberto NeaguAbstract:The present work describes the effect on the performance of a SOFC when a Gd 0.2Ce 0.8O 1.9 (GDC) layer is introduced as diffusion barrier layer between the yttria stabilized zirconia (YSZ) electrolyte and the La 0.6Sr 0.4Co 1-xFe xO 3-\u3b4 (LSCF) cathode of an anode supported cell with Ni-YSZ anode. The dense, thin and fully crystalline GDC films were directly applied by RSDT, without any post-Deposition heating or sintering steps. The quality of the film and performance of the cell prepared by Reactive Spray Deposition Technology (RSDT) was compared to a GDC blocking layer deposited by screen printing (SP) and then sintered at 1000\ub0C. By applying RSDT to deposit the GDC-barrier layer onto the YSZ electrolyte a lower ohmic resistance was obtained for the RSDT deposited cell vs. the SP cell. The lower resistance can be attributed to the well crystallized, thin and dense GDC layer deposited at 900\ub0C. \ua9The Electrochemical Society.Peer reviewed: YesNRC publication: Ye
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Flame-Based Technologies and Reactive Spray Deposition Technology for Low-Temperature Solid Oxide Fuel Cells: Technical and Economic Aspects
Journal of Thermal Spray Technology, 2011Co-Authors: Radenka Maric, Justin Roller, Roberto NeaguAbstract:The economic and technical breakthroughs in solid oxide fuel cell (SOFC) for commercial success still depend on high-quality manufacture, reliability, efficiency, and must have an acceptable cost when compared to competing technologies. The application of flame-based technologies as a one-step Deposition technique for SOFC component manufacture has potential to reduce both cost and production time. In this article, cells produced by flame processes have been reviewed with emphases placed on the Reactive Spray Deposition Technology technique. Various experimental methods and examples for the synthesis of porous electrodes and dense electrolytes are reviewed. The studies focus on determining the range of the flame conditions under which each of the individual cell components for low temperature SOFC applications ~600 °C could be successfully deposited.
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Thin Film Low Temperature Solid Oxide Fuel Cell (LTSOFC) by Reactive Spray Deposition Technology (RSDT)
ECS Transactions, 2011Co-Authors: Radenka Maric, Dai Nishijima, Keizo Furusaki, Roberto NeaguAbstract:The present work describes the effect on the performance of a SOFC when a Gd0.2Ce0.8O1.9 (GDC) layer has been introduced as diffusion barrier layer between the yttria stabilized zirconia (YSZ) electrolyte and the La0.6Sr0.4Co1-xFexO3-δ (LSCF) cathode of an anode supported cell with a Ni-YSZ anode. The dense, thin and fully crystalline GDC films were directly applied by RSDT, without any post-Deposition heating or sintering steps. The quality of the film and performance of the cell prepared by Reactive Spray Deposition Technology (RSDT) was compared to a GDC blocking layer deposited by screen printing (SP) and then sintered at 1000 oC. By applying RSDT to deposit the GDC- barrier layer onto the YSZ electrolyte a lower ohmic resistance has been obtained for the RSDT deposited cell vs. the SP cell. The lower resistance can be attributed to the well crystallized, thin and dense GDC layer deposited at 900 oC.
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reactive spray Deposition Technology an one step Deposition technique for solid oxide fuel cell barrier layers
Journal of Power Sources, 2010Co-Authors: Radenka Maric, Roberto Neagu, Ye Zhangsteenwinkel, Frans Van Berkel, Bert RietveldAbstract:abstract InordertoreducethecostofthemanufacturingofSolidOxideFuelCells(SOFC),andtoenablemetalsup-ported cell fabrication, a new fabrication method called Reactive Spray Deposition Technology (RSDT)for direct Deposition of the material onto ceramic or metal support for low temperature SOFC is cur-rently being developed. The present work describes the effect on the performance of a SOFC when aGd 0.2 Ce 0.8 O 1.9 (GDC)layerhasbeenintroducedasdiffusionbarrierlayerbetweentheyttriastabilizedzir-conia (YSZ) electrolyte and the La 0.6 Sr 0.4 CoO 3−i (LSC) cathode. The dense, thin and fully crystalline GDClmsweredirectlyappliedbyRSDT,withoutanypost-Depositionheatingorsinteringstep.Thequalityofthe lm and performance of the cell prepared by RSDT was compared to a GDC blocking layer depositedby screen printing (SP) and then sintered. The observed ohmic resistance of the ASC with a GDC layerdeposited by RSDT is 0.24cm 2 , which is close to the expected theoretical value of 0.17cm 2 for a5- m thick 8mol% yttria YSZ (8YSZ) electrolyte at 873K.Crown Copyright © 2010 Published by Elsevier B.V. All rights reserved.
Bert Rietveld - One of the best experts on this subject based on the ideXlab platform.
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reactive spray Deposition Technology an one step Deposition technique for solid oxide fuel cell barrier layers
Journal of Power Sources, 2010Co-Authors: Radenka Maric, Roberto Neagu, Ye Zhangsteenwinkel, Frans Van Berkel, Bert RietveldAbstract:abstract InordertoreducethecostofthemanufacturingofSolidOxideFuelCells(SOFC),andtoenablemetalsup-ported cell fabrication, a new fabrication method called Reactive Spray Deposition Technology (RSDT)for direct Deposition of the material onto ceramic or metal support for low temperature SOFC is cur-rently being developed. The present work describes the effect on the performance of a SOFC when aGd 0.2 Ce 0.8 O 1.9 (GDC)layerhasbeenintroducedasdiffusionbarrierlayerbetweentheyttriastabilizedzir-conia (YSZ) electrolyte and the La 0.6 Sr 0.4 CoO 3−i (LSC) cathode. The dense, thin and fully crystalline GDClmsweredirectlyappliedbyRSDT,withoutanypost-Depositionheatingorsinteringstep.Thequalityofthe lm and performance of the cell prepared by RSDT was compared to a GDC blocking layer depositedby screen printing (SP) and then sintered. The observed ohmic resistance of the ASC with a GDC layerdeposited by RSDT is 0.24cm 2 , which is close to the expected theoretical value of 0.17cm 2 for a5- m thick 8mol% yttria YSZ (8YSZ) electrolyte at 873K.Crown Copyright © 2010 Published by Elsevier B.V. All rights reserved.
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Reactive spray Deposition Technology - An one-step Deposition technique for solid oxide fuel cell barrier layers
Journal of Power Sources, 2010Co-Authors: Radenka Maric, Ye Zhang-steenwinkel, F.p.f. Van Berkel, Roberto Neagu, Bert RietveldAbstract:In order to reduce the cost of the manufacturing of Solid Oxide Fuel Cells (SOFC), and to enable metal supported cell fabrication, a new fabrication method called Reactive Spray Deposition Technology (RSDT) for direct Deposition of the material onto ceramic or metal support for low temperature SOFC is currently being developed. The present work describes the effect on the performance of a SOFC when a Gd0.2Ce0.8O1.9(GDC) layer has been introduced as diffusion barrier layer between the yttria stabilized zirconia (YSZ) electrolyte and the La0.6Sr0.4CoO3-δ(LSC) cathode. The dense, thin and fully crystalline GDC films were directly applied by RSDT, without any post-Deposition heating or sintering step. The quality of the film and performance of the cell prepared by RSDT was compared to a GDC blocking layer deposited by screen printing (SP) and then sintered. The observed ohmic resistance of the ASC with a GDC layer deposited by RSDT is 0.24 Ω cm2, which is close to the expected theoretical value of 0.17 Ω cm2for a 5-μm thick 8 mol% yttria YSZ (8YSZ) electrolyte at 873 K. © 2010 Elsevier B.V. All rights reserved.
Ye Zhang-steenwinkel - One of the best experts on this subject based on the ideXlab platform.
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Reactive spray Deposition Technology - An one-step Deposition technique for solid oxide fuel cell barrier layers
Journal of Power Sources, 2010Co-Authors: Radenka Maric, Ye Zhang-steenwinkel, F.p.f. Van Berkel, Roberto Neagu, Bert RietveldAbstract:In order to reduce the cost of the manufacturing of Solid Oxide Fuel Cells (SOFC), and to enable metal supported cell fabrication, a new fabrication method called Reactive Spray Deposition Technology (RSDT) for direct Deposition of the material onto ceramic or metal support for low temperature SOFC is currently being developed. The present work describes the effect on the performance of a SOFC when a Gd0.2Ce0.8O1.9(GDC) layer has been introduced as diffusion barrier layer between the yttria stabilized zirconia (YSZ) electrolyte and the La0.6Sr0.4CoO3-δ(LSC) cathode. The dense, thin and fully crystalline GDC films were directly applied by RSDT, without any post-Deposition heating or sintering step. The quality of the film and performance of the cell prepared by RSDT was compared to a GDC blocking layer deposited by screen printing (SP) and then sintered. The observed ohmic resistance of the ASC with a GDC layer deposited by RSDT is 0.24 Ω cm2, which is close to the expected theoretical value of 0.17 Ω cm2for a 5-μm thick 8 mol% yttria YSZ (8YSZ) electrolyte at 873 K. © 2010 Elsevier B.V. All rights reserved.
F.p.f. Van Berkel - One of the best experts on this subject based on the ideXlab platform.
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Reactive spray Deposition Technology - An one-step Deposition technique for solid oxide fuel cell barrier layers
Journal of Power Sources, 2010Co-Authors: Radenka Maric, Ye Zhang-steenwinkel, F.p.f. Van Berkel, Roberto Neagu, Bert RietveldAbstract:In order to reduce the cost of the manufacturing of Solid Oxide Fuel Cells (SOFC), and to enable metal supported cell fabrication, a new fabrication method called Reactive Spray Deposition Technology (RSDT) for direct Deposition of the material onto ceramic or metal support for low temperature SOFC is currently being developed. The present work describes the effect on the performance of a SOFC when a Gd0.2Ce0.8O1.9(GDC) layer has been introduced as diffusion barrier layer between the yttria stabilized zirconia (YSZ) electrolyte and the La0.6Sr0.4CoO3-δ(LSC) cathode. The dense, thin and fully crystalline GDC films were directly applied by RSDT, without any post-Deposition heating or sintering step. The quality of the film and performance of the cell prepared by RSDT was compared to a GDC blocking layer deposited by screen printing (SP) and then sintered. The observed ohmic resistance of the ASC with a GDC layer deposited by RSDT is 0.24 Ω cm2, which is close to the expected theoretical value of 0.17 Ω cm2for a 5-μm thick 8 mol% yttria YSZ (8YSZ) electrolyte at 873 K. © 2010 Elsevier B.V. All rights reserved.