scholarly journals Determination of Kinetic Parameters for the Oxygen Reduction Reaction on Platinum in an AEMFC

2021 ◽  
Author(s):  
Henrik Grimler ◽  
Annika Carlson ◽  
Henrik Ekström ◽  
Carina Lagergren ◽  
Rakel Wreland Lindström ◽  
...  
Keyword(s):  
Oxygen Reduction Reaction ◽  
Oxygen Partial Pressure ◽  
Partial Pressure ◽  
Oxygen Reduction ◽  
Platinum Catalyst ◽  
Porous Electrode ◽  
Gas Diffusion ◽  
Reduction Reaction ◽  
Partial Pressures ◽  
Kinetic Region

Abstract To promote the development of anion exchange membrane fuel cells (AEMFC), an understanding of the oxygen reduction reaction (ORR) kinetics in porous gas diffusion electrodes is essential. In this work, experimental polarisation curves for electrodes with different platinum catalyst loadings and oxygen partial pressures at the cathode are fitted to a physics-based porous electrode model in the voltage range from open circuit voltage (OCV) to 0.7 V. The model is verified against polarisation curves with different anode platinum catalyst loading, and hydrogen partial pressures. The reactions are described using a two-step Tafel-Volmer pathway at the anode and concentration-dependent Butler-Volmer kinetics at the cathode. The model shows a good fit to the kinetic region with an exchange current density of 1.0e-8 A/cm2, for oxygen humidified to 95 % RH at 50 °C, a charge transfer coefficient of 0.8 and a first order dependence on oxygen partial pressure. For lower oxygen partial pressure, hydrogen crossover is needed for explaining the downward shift of the polarisation curves in the kinetic region. In the experimental data, the polarisation curves show an apparent limitation at lower hydrogen partial pressures, which can be explained by the lower rate of the Tafel step at these conditions.

The Influence of the Oxygen Partial Pressure on the Oxygen Reduction Reaction Kinetics for the Low Platinum Loading Catalysts

2017 ◽  
Vol 77 (11) ◽  
pp. 1283-1290
Author(s):  
Rutha Jäger ◽  
Piia Ereth Kasatkin ◽  
Eneli Härk ◽  
Indrek Tallo ◽  
Tanja Kallio ◽  
...  
Keyword(s):  
Oxygen Reduction Reaction ◽  
Oxygen Partial Pressure ◽  
Partial Pressure ◽  
Reaction Kinetics ◽  
Oxygen Reduction ◽  
Reduction Reaction ◽  
Platinum Loading

Foreign Gas Behavior of Oxygen Reduction Reaction on a Gas Diffusion Hybrid Polymer Electrode

1991 ◽  
Vol 23 (3) ◽  
pp. 247-252 ◽  
Author(s):  
Masakazu Sakaguchi ◽  
Mineo Sato ◽  
Miki Kawashima ◽  
Yoshikazu Sato
Keyword(s):  
Oxygen Reduction Reaction ◽  
Oxygen Reduction ◽  
Gas Diffusion ◽  
Reduction Reaction ◽  
Hybrid Polymer

Oxygen Reduction Reaction Evaluation of Platinum Catalysts Formed via the Reactive Spray Deposition Technique

2011 ◽  
Author(s):  
Justin Roller ◽  
Radenka Maric ◽  
Roberto Neagu ◽  
Frank Orfino
Keyword(s):  
Oxygen Reduction Reaction ◽  
Oxygen Reduction ◽  
Platinum Catalyst ◽  
Spray Deposition ◽  
Research Work ◽  
Carbon Support ◽  
Reduction Reaction ◽  
Intrinsic Activity ◽  
Rotating Disc ◽  
Direct Deposition

Reactive Spray Deposition Technology (RSDT) is a fabrication process developed for the 1-step deposition of platinum catalyst, carbon support and ionomer directly onto a Nafion® membrane. The process involves pumping a platinum-organic solute dissolved in a combustible solvent through an atomizer. The spray is then combusted and nanosized particles of platinum are produced and subsequently cooled by a gas quench. Once the reaction plume is cooled a secondary set of nozzles is used to inject the carbon support and ionomer. The quench air cools the reactive zone enough to allow direct deposition onto a Nafion® electrolyte or a glassy carbon electrode. This arrangement thus realizes a process for one-step catalyst formation, dispersion onto carbon and direct deposition onto an electrolyte membrane. The independent control of the three components allows for real-time control of the carbon, platinum, and ionomer ratios in the final electrode. In this research work we examine the oxygen reduction reaction via a rotating disc three electrode set-up to understand the intrinsic activity of the as-sprayed platinum. The mass and specific activities were measured in a 0.1 M perchloric acid electrolyte under different deposition conditions and loading was verified by atomic emission spectroscopy inductively coupled plasma (AES-ICP). A range of microscopy images for visualization of the microstructure are also presented. The initial results show that the RSDT technique is capable of producing catalysts with oxygen reduction mass activity at 0.9 V of 200 mA/mgPt rotating at 1600 rpm and 30 °C.

scholarly journals Nanostructured gas diffusion layer to improve direct oxygen reduction reaction in Air-Cathode Single-Chamber Microbial Fuel Cells

2022 ◽  
Vol 334 ◽  
pp. 04012
Author(s):  
Giulia Massaglia ◽  
Eve Verpoorten ◽  
Candido F. Pirri ◽  
Marzia Quaglio
Keyword(s):  
Fuel Cells ◽  
Oxygen Reduction Reaction ◽  
Oxygen Reduction ◽  
Microbial Fuel Cells ◽  
Oxygen Diffusion ◽  
Energy Recovery ◽  
Gas Diffusion ◽  
Reduction Reaction ◽  
Air Cathode ◽  
The One

The aim of this work is the development of new nanostructured-gas-diffusion-layer (GDL) to improve the overall behaviour of Air-Cathode Single-Chamber-Microbial-Fuel-Cells (SCMFCs). The design of new nanostructured-GDL allowed exploiting all nanofibers ’intrinsic properties, such as high surface ratio to volume, high porosity, achieving thus a good oxygen diffusion into the proximity of catalyst layer, favouring thus the direct oxygen-reduction-reaction (ORR). Nanostructured-GDLs were prepared by electrospinning process, using a layer-by-layer deposition to collect 2 nanofibers’ mats. The first layer was made of cellulose nanofibers able to promote oxygen diffusion into SCMFC. The second layer, placed outwards, was based on polyvinyl-fluoride (PVDF) nanofibers to prevent the electrolyte leakage. This nanostructured-GDL plays a pivotal role to improve the overall performance of Air-Cathode-SCMFCs. A maximum current density of 20 mA m-2 was obtained, which is higher than the one reached with commercial-GDL, used as reference material. All results were analysed in terms of energy recovery parameter, defined as ratio of generated power integral and the internal volume of devices, evaluating the overall SCMFC performance. SCMFCs with a nanostructured-GDL showed an energy recovery equal to 60.83 mJ m-3, which was one order of magnitude higher than the one obtained with commercial-GDL, close to 3.92 mJ m-3.

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