scholarly journals Corrosion performance of graphene oxide coated 304 SS in PEMFC environment

2021 ◽  
Vol 3 (7) ◽  
Author(s):  
Pramod Mandal ◽  
N Usha Kiran ◽  
Uttam K Chanda ◽  
Soobhankar Pati ◽  
Sudesna Roy
Keyword(s):  
Graphene Oxide ◽  
Compaction Pressure ◽  
Polymer Electrolyte Membrane ◽  
Corrosion Current ◽  
304 Stainless Steel ◽  
Corrosion Performance ◽  
Electrolyte Membrane ◽  
Corrosion Mechanisms ◽  
Interfacial Contact Resistance ◽  
Polarization Plot

AbstractIn this work, an electrophoretic deposition technique was used to deposit graphene oxide (GO) on 304 stainless steel. Its corrosion performance was evaluated in a simulated polymer electrolyte membrane fuel cell environment. The corrosion current density (icorr) and interfacial contact resistance (ICR) were measured at 8.9 µA/cm2 and 19.3 mΩ cm2, respectively. The icorr of GO coated 304SS is several orders lower than bare SS 304. Similarly, the ICR of GO coated 304SS is nearly half of bare 304SS at a compaction pressure of 150 N/cm2. The potentiodynamic polarization plot indicates the prevalence of multiple corrosion mechanisms. A prolonged corrosion study for 30 days immersed in the simulated PEM cell environment shows the formation of rounded pits that corroborate the activity of pitting corrosion.

Bio-Based Anti-Corrosion Polymer Coating for Fuel Cells Bipolar Plates

2020 ◽  
Vol 869 ◽  
pp. 413-418
Author(s):  
Nikita Faddeev ◽  
Victor Klushin ◽  
Nina Smirnova
Keyword(s):  
Fuel Cells ◽  
Polymer Coating ◽  
Plant Biomass ◽  
Polymer Electrolyte Membrane ◽  
Conductive Polymer ◽  
Corrosion Current ◽  
Bipolar Plates ◽  
Electrolyte Membrane ◽  
Interfacial Contact Resistance ◽  
By Products

A highly corrosion resistant and conductive polymer coating for polymer electrolyte membrane fuel cells bipolar plates have been successfully prepared from renewable plant biomass sources. The coating is based on the 5-hydroxymethylfurfural synthesis by-product resin that consists of complex furanic oligomers and polymers. The corrosion resistance and conductivity of coated titanium plates have been studied. As-prepared coated Ti samples are shown 0.083 μA/cm2 and 0.32 μA/cm2 corrosion current in the simulated PEMFCs cathode and anode environment respectively. In addition, the polymer coating are reduced the interfacial contact resistance of bare titanium up to 40 %. The Ti plates coated with by-products of 5-HMF synthesis are shown a great potential application as bipolar plates for PEMFCs.

Modeling the Effective Thermal Conductivity of an Anisotropic Gas Diffusion Layer in a Polymer Electrolyte Membrane Fuel Cell

2011 ◽  
Author(s):  
J. Yablecki ◽  
A. Bazylak
Keyword(s):  
Thermal Conductivity ◽  
Fuel Cell ◽  
Effective Thermal Conductivity ◽  
Polymer Electrolyte ◽  
Diffusion Layer ◽  
Compaction Pressure ◽  
Polymer Electrolyte Membrane ◽  
Gas Diffusion Layer ◽  
Gas Diffusion ◽  
Electrolyte Membrane

The anisotropic and heterogeneous effective thermal conductivity of the gas diffusion layer (GDL) of the polymer electrolyte membrane fuel cell was determined in the through-plane direction using an analytical thermal resistance model. The geometry of the GDL was reconstructed using porosity profiles obtained through microscale computed tomography imaging of four commercially available GDL materials. The effective thermal conductivity increases almost linearly with increasing bipolar plate compaction pressure. The effective thermal conductivity was also seen to increase with increasing GDL thickness as bulk porosity remained almost constant. The effect of the heterogeneous through-plane porosity distribution on the effective thermal conductivity is discussed. The outcomes of this work will provide insight into the effect of heterogeneity and anisotropy of the GDL on the thermal management required for improved PEMFC performance.

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