The Investigation of Electrochemical Oxidation of Formic Acid on Pt, Pd and PtRu Modified Gas Diffusion Layer

2011 ◽  
Vol 9 (1) ◽  
Author(s):  
Fatih Köleli ◽  
Anya Beytaroglu ◽  
Derya Röpke ◽  
Thorsten Röpke ◽  
Rezzan Aydin
Keyword(s):  
Formic Acid ◽  
Acidic Solution ◽  
Electrochemical Impedance ◽  
Gas Diffusion ◽  
Gas Diffusion Electrodes ◽  
Cyclic Voltammetric ◽  
Medium Temperature ◽  
Gas Diffusion Layers ◽  
Catalytic Activities ◽  
Diffusion Layers

Catalytic activities of platinum (Pt), palladium (Pd) and platinum-ruthenium (PtRu black) modified gas diffusion layers (GDL), so called gas diffusion electrodes (GDE),were studied for electrooxidation of formic acid in aqueous acidic solution. The effects of formic acid concentration and medium temperature on the oxidation were investigated. Additionally, cyclic voltammetric investigation (CV), electrochemical impedance spectroscopy (EIS) and amperometric measurements were carried out by using modified catalysts. Electrochemical measurements indicated that the modified PtRu/C black exhibits higher electrocatalytic activity than Pt/C and Pd/C catalysts.

Imaging of desaturation of the frozen gas diffusion layers by synchrotron X-ray radiography

2021 ◽  
Author(s):  
Yuzhou Zhang ◽  
Viral Hirpara ◽  
Virat Patel ◽  
Chen Li ◽  
Ryan Anderson ◽  
...  
Keyword(s):  
Gas Diffusion ◽  
Gas Diffusion Layers ◽  
X Ray ◽  
Diffusion Layers

scholarly journals Mass Transport Limitations of Water Evaporation in Polymer Electrolyte Fuel Cell Gas Diffusion Layers

Energies ◽  
2021 ◽  
Vol 14 (10) ◽  
pp. 2967
Author(s):  
Adrian Mularczyk ◽  
Andreas Michalski ◽  
Michael Striednig ◽  
Robert Herrendörfer ◽  
Thomas J. Schmidt ◽  
...  
Keyword(s):  
Fuel Cell ◽  
Liquid Water ◽  
Evaporative Cooling ◽  
Gas Diffusion ◽  
Polymer Electrolyte Fuel Cell ◽  
Ex Situ ◽  
Water Evaporation ◽  
Evaporative Water ◽  
Gas Diffusion Layers ◽  
Diffusion Layers

Facilitating the proper handling of water is one of the main challenges to overcome when trying to improve fuel cell performance. Specifically, enhanced removal of liquid water from the porous gas diffusion layers (GDLs) holds a lot of potential, but has proven to be non-trivial. A main contributor to this removal process is the gaseous transport of water following evaporation inside the GDL or catalyst layer domain. Vapor transport is desired over liquid removal, as the liquid water takes up pore space otherwise available for reactant gas supply to the catalytically active sites and opens up the possibility to remove the waste heat of the cell by evaporative cooling concepts. To better understand evaporative water removal from fuel cells and facilitate the evaporative cooling concept developed at the Paul Scherrer Institute, the effect of gas speed (0.5–10 m/s), temperature (30–60 °C), and evaporation domain (0.8–10 mm) on the evaporation rate of water from a GDL (TGP-H-120, 10 wt% PTFE) has been investigated using an ex situ approach, combined with X-ray tomographic microscopy. An along-the-channel model showed good agreement with the measured values and was used to extrapolate the differential approach to larger domains and to investigate parameter variations that were not covered experimentally.

Sign in / Sign up

Export Citation Format

Share Document