TY - CHAP A1 - Muntean, Roxana A1 - Pascal, Dragos-Toader A1 - Rost, Ulrich A1 - Podleschny, Pit Yannick A1 - Marginean, Gabriela A1 - Schumacher, Marc T1 - Studies on pulse electrodeposition of Pt-Ni binary alloy for electrochemical cell applications, 7th International Symposium on Advanced Materials and Structures T2 - Konferenz: 7th International Conference on Advanced Materials and Structures (AMS 2018), 28.-31. März 2018 in Timisoara (Rumänien) Y1 - 2018 ER - TY - JOUR A1 - Muntean, Roxana A1 - Rost, Ulrich A1 - Pascal, Dragos-Toader A1 - Marginean, Gabriela A1 - Vaszilcsin, Nicolae T1 - Determination of the Electrochemical Surface Area for CNF-Pt Electrocatalyst Using Cyclic Voltammetry JF - Chemical Bulletin of “Politehnica” University of Timisoara, Romania N2 - Carbon Nanofibers (CNF) are considered to be a promising catalyst support material due to their unique characteristics, excellent mechanical, electrical and structural properties, high surface area and nevertheless, good interaction with metallic catalyst particles. The possibility of preparing CNF decorated with platinum by an electrochemical method was tested, using a hexachloroplatinic bath solution. The experiments were carried out with the aid of a Potentiostat/Galvanostat Ivium Technologies Vertex, in a three – electrode cell. The aim of the present work was to determine the electrochemical surface area (ECSA) of the CNF-Pt catalysts in relation to the functionalization treatment of fibers, using an electrochemical method. ECSA for different functionalized CNF-Pt catalysts was determined by cyclic voltammetry in 0.5 M H2SO4 solution. The highest active surface of platinum was obtained for the samples with CNF functionalized by plasma treatment using 80 W for 1800 s. The obtained results correlate very well with the particles size and distribution of platinum, revealed by scanning electron microscopy (SEM) and the quantity of deposited platinum determined by thermo gravimetrical analysis (TGA) respectively. Cyclic voltammetry (CV) has been proven to be a suitable method for estimation of the ECSA of the electrocatalysts. KW - carbon nanofibers KW - platinum electrodeposition KW - electrochemical surface area Y1 - 2016 VL - 61 (75) IS - 2 SP - 44 EP - 48 ER - TY - JOUR A1 - Muntean, Roxana A1 - Pascal, Dragos-Toader A1 - Rost, Ulrich A1 - Holtkotte, Lisa A1 - Näther, Johannes A1 - Köster, Frank A1 - Underberg, Martin A1 - Hülser, Tim A1 - Brodmann, Michael T1 - Investigation of Iridium Nanoparticles Supported on Sub-stoichiometric Titanium Oxides as Anodic Electrocatalysts in PEM Electrolysis. Part I.: Synthesis and Characterization JF - Topics in Catalysis Y1 - 2019 U6 - https://doi.org/10.1007/s11244-019-01164-3 SN - 1022-5528 VL - 62 IS - 5-6 SP - 429 EP - 438 ER - TY - JOUR A1 - Muntean, Roxana A1 - Pascal, Dragos-Toader A1 - Rost, Ulrich A1 - Holtkotte, Lisa A1 - Näther, Johannes A1 - Köster, Frank A1 - Underberg, Martin A1 - Hülser, Tim A1 - Brodmann, Michael T1 - Investigation of Iridium Nanoparticles Supported on Sub-stoichiometric Titanium Oxides as Anodic Electrocatalysts in PEM Electrolysis. Part I.: Synthesis and Characterization JF - Topics in Catalysis Y1 - 2019 U6 - https://doi.org/10.1007/s11244-019-01164-3 SN - 1022-5528 VL - 62 IS - 5/6 SP - 429 EP - 438 ER - TY - JOUR A1 - Rost, Ulrich A1 - Podleschny, Pit Yannick A1 - Schumacher, Marc A1 - Muntean, Roxana A1 - Pascal, Dragos-Toader A1 - Mutascu, Cristian A1 - Koziolek, J. A1 - Marginean, Gabriela A1 - Brodmann, Michael T1 - Long-term Stable Electrodes Based on Platinum Electrocatalysts Supported on Titanium Sintered Felt for the Use in PEM Fuel Cells JF - IOP conference series. Materials science and engineering Y1 - 2018 U6 - https://doi.org/10.1088/1757-899X/416/1/012013 SN - 1757-8981 IS - 416 SP - 012013 ER - TY - JOUR A1 - Muntean, Roxana A1 - Pascal, Dragos-Toader A1 - Rost, Ulrich A1 - Marginean, Gabriela A1 - Brodmann, Michael A1 - Vaszilcsin, Nicolae T1 - Synthesis and characterisation of platinum–cobalt–manganese ternary alloy catalysts supported on carbon nanofibers: An alternative catalyst for hydrogen evolution reaction JF - International Journal of Hydrogen Energy N2 - A systematic method for obtaining a novel electrode structure based on PtCoMn ternary alloy catalyst supported on graphitic carbon nanofibers (CNF) for hydrogen evolution reaction (HER) in acidic media is proposed. Ternary alloy nanoparticles (Co0.6Mn0.4 Pt), with a mean crystallite diameter under 10 nm, were electrodeposited onto a graphitic support material using a two-step pulsed deposition technique. Initially, a surface functionalisation of the carbon nanofibers is performed with the aid of oxygen plasma. Subsequently, a short galvanostatic pulse electrodeposition technique is applied. It has been demonstrated that, if pulsing current is employed, compositionally controlled PtCoMn catalysts can be achieved. Variations of metal concentration ratios in the electrolyte and main deposition parameters, such as current density and pulse shape, led to electrodes with relevant catalytic activity towards HER. The samples were further characterised using several physico-chemical methods to reveal their morphology, structure, chemical and electrochemical properties. X-ray diffraction confirms the PtCoMn alloy formation on the graphitic support and energy dispersive X-ray spectroscopy highlights the presence of the three metallic components from the alloy structure. The preliminary tests regarding the electrocatalytic activity of the developed electrodes display promising results compared to commercial Pt/C catalysts. The PtCoMn/CNF electrode exhibits a decrease in hydrogen evolution overpotential of about 250 mV at 40 mA cm−2 in acidic solution (0.5 M H2SO4) when compared to similar platinum based electrodes (Pt/CNF) and a Tafel slope of around 120 mV dec−1, indicating that HER takes place under the Volmer-Heyrovsky mechanism. KW - PtCoMn KW - Ternary alloy catalyst preparation KW - PEM water electrolysis KW - Hydrogen evolution reaction Y1 - 2020 U6 - https://doi.org/10.1016/j.ijhydene.2020.02.041 SN - 0360-3199 ER - TY - CHAP A1 - Rost, Ulrich A1 - Podleschny, Pit Yannick A1 - Schumacher, Marc A1 - Muntean, Roxana A1 - Pascal, Dragos-Toader A1 - Mutascu, Cristian A1 - Koziolek, J. A1 - Marginean, Gabriela A1 - Brodmann, Michael T1 - Long-term Stable Electrodes Based on Platinum Electrocatalysts Supported on Titanium Sintered Felt for the Use in PEM Fuel Cells T2 - Konferenz: 7th International Conference on Advanced Materials and Structures (AMS 2018), 28.-31. März 2018 in Timisoara (Rumänien) Y1 - 2018 ER - TY - JOUR A1 - Muntean, Roxana A1 - Pascal, Dragos-Toader A1 - Rost, Ulrich A1 - Marginean, Gabriela A1 - Brodmann, Michael A1 - Vaszilcsin, Nicolae T1 - Synthesis and characterisation of platinum–cobalt–manganese ternary alloy catalysts supported on carbon nanofibers: An alternative catalyst for hydrogen evolution reaction JF - International Journal of Hydrogen Energy Y1 - 2020 U6 - https://doi.org/10.1016/j.ijhydene.2020.02.041 VL - 45 IS - 49 SP - 26217 EP - 26225 ER - TY - CHAP A1 - Muntean, Roxana A1 - Pascal, Dragos-Toader A1 - Rost, Ulrich A1 - Marginean, Gabriela A1 - Vaszilcsin, Nicolae A1 - Brodmann, Michael T1 - PtCoMn ternary alloy supported catalysts for hydrogen evolution reaction T2 - Konferenz: 10th International Conference on Hydrogen Production, 15.-17. Mai 2019 in Cluj-Napoca, Rumänien Y1 - 2019 ER - TY - JOUR A1 - Rost, Ulrich A1 - Muntean, Roxana A1 - Pascal, Dragos-Toader A1 - Podleschny, Pit Yannick A1 - Schumacher, Marc A1 - Marginean, Gabriela T1 - Studies on Pulse Electrodeposition of Pt-Ni binary Alloy For Electrochemical Cell Applications JF - IOP conference series. Materials science and engineering Y1 - 2018 U6 - https://doi.org/10.1088/1757-899X/416/1/012004 SN - 1757-8981 IS - 416 SP - 012004 ER -