Non-PGM membrane electrode assemblies: Optimization for performance

Stariha, Sarah; Artyushkova, Kateryna; Serov, Alexey; Atanassov, Plamen

doi:10.1016/j.ijhydene.2015.05.185

Cited by 34 publications

(23 citation statements)

References 24 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…We further list a number of important FC operation parameters used in each of these studies. It should be pointed out that there are many parameters that have an impact on the measured NPMC activity originating both from the procedure used for membrane electrode assembly (MEA) preparation 82, 177 and from the fuel cell operation. While this not only complicates measurements, it was also shown that NPMCs can be strongly affected, by e.g.…”

Section: Evaluation and Characterization Of Npmcsmentioning

confidence: 99%

Recent Progress in Synthesis, Characterization and Evaluation of Non‐Precious Metal Catalysts for the Oxygen Reduction Reaction

2016

View full text Add to dashboard Cite

The oxygen reduction reaction (ORR) is usually catalyzed by precious metals. As the kinetics of the reaction are sluggish comparatively large amounts of precious metal are needed to achieve satisfactory reaction rates. This results in high cost of technologies utilizing the ORR, like low temperature fuel cells. Recent years have seen tremendous research efforts in the development of non‐precious metal catalysts (NPMCs) with a wide range of newly developed materials resulting in improved catalyst materials, an increased understanding of the ORR mechanism on NPMC materials and better knowledge of the active site structure. Here we summarize the developments from 2011 and onwards with a special focus on carbon‐based NPMCs developed for use in acid environments. We include explicit comparisons of PEMFC measurement results in all referenced studies and detailed information on the physical characterization methods used in various publications.

show abstract

Section: Evaluation and Characterization Of Npmcsmentioning

confidence: 99%

Recent Progress in Synthesis, Characterization and Evaluation of Non‐Precious Metal Catalysts for the Oxygen Reduction Reaction

2016

View full text Add to dashboard Cite

show abstract

“…For each MEAs prepared, there is a complex relation between MNC catalysts and ionomer (often Nafion®) affecting the overall performance of the fuel cell. 38,39 It has been shown that ~ 50 wt % Nafion® resulted in optimum MEA performance for non-PGM catalysts. 39 In this study 55 wt % Nafion® content was used in The obtained result from best performing Fe-N-C are comparable to those recently published Fe-N-C catalysts prepared by high pressure pyrolysis 19 and reactive ball-milling methods 39 .…”

Section: Electrochemical Characterizationmentioning

confidence: 99%

Effect of pyrolysis pressure on activity of Fe–N–C catalysts for oxygen reduction

et al. 2015

View full text Add to dashboard Cite

Iron and nitrogen doped carbon, Fe-N-C, catalysts are synthesized by high pressure pyrolysis of Ketjenblack carbon, melamine and iron acetate precursor mixture in a closed, reusable scale-up stainless steel reactor. The effects of precursor loading with constant precursor ratios on obtained pressure, nitrogen retention and oxygen reduction reaction (ORR) activities are studied. The results indicate that higher precursor loading increases the gas phase pressure and improves nitrogen retention and ORR activity. Furthermore, a relationship is found between active site density, nitrogen retention and pressure that suggests that the limiting reaction may be an adsorption process driven via high pressure of volatile intermediates from the melamine. Figure 7. a) Fuel cell polarization curves of Fe-N-C samples obtained in a single cell (5 cm 2 ) on air with 2.5 bar back pressure. The loadings are 2.4-3.2 mg cm -2 and normalized to 3 mg cm -2 and b) fuel cell polarization curves of 3.5 g Batch with 2.5 back pressure in air and 0.5 bar backpressure in O2. The loadings are 3 mg cm -2 .Polarization curves were obtained at 100% RH using 211 Nafion®, 55 wt% 1100 EW and 25BC GDL.

show abstract

“…The catalyst was synthesized using a modified version of the SSM as described in the literature. [7,10,14,15] The specific reagent formulation and processing procedure is proprietary technology developed by UNM and Pajarito Powder, LLC. MEAs (geometrical area: 5 and 50 cm 2 ) were made from gas diffusion electrodes (GDEs) pressed with 211 Nafion ® membrane using PTFE-impregnated glass-fiber sub-gaskets at 131 °C for 10 minutes (90 psi for 5 cm 2 and 70 psi for 50 cm 2 sized electrodes, respectively), then allowed to cool down under 1 psi pressure.…”

Section: Methodsmentioning

confidence: 99%

Highly stable precious metal-free cathode catalyst for fuel cell application

Serov

Workman

Artyushkova

et al. 2016

Journal of Power Sources

Self Cite

View full text Add to dashboard Cite

A platinum group metal-free (PGM-free) oxygen reduction reaction (ORR) catalyst engineered for stability has been synthesized using the sacrificial support method (SSM). This catalyst was comprehensively characterized by physiochemical analyses and tested for performance and durability in fuel cell membrane electrode assemblies (MEAs). This catalyst, belonging to the family of Fe-N-C materials, is easily scalable and can be manufactured in batches up to 200 g. The fuel cell durability tests were performed in a single cell configuration at realistic operating conditions of 0.65 V, 1.25 atm gauge air, and 90% RH for 100 hours. In-depth characterization of surface chemistry and morphology of the catalyst layer before and after durability tests were performed. The failure modes of the PGM-free electrodes were derived from structure-to-property correlations. It is

show abstract

Non-PGM membrane electrode assemblies: Optimization for performance

Cited by 34 publications

References 24 publications

Recent Progress in Synthesis, Characterization and Evaluation of Non‐Precious Metal Catalysts for the Oxygen Reduction Reaction

Recent Progress in Synthesis, Characterization and Evaluation of Non‐Precious Metal Catalysts for the Oxygen Reduction Reaction

Effect of pyrolysis pressure on activity of Fe–N–C catalysts for oxygen reduction

Highly stable precious metal-free cathode catalyst for fuel cell application

Contact Info

Product

Resources

About