Investigation of Pt catalytic effects on carbon support corrosion of the cathode catalyst in PEM fuel cells using DEMS spectra

Li, Wei; Lane, Alan M.

doi:10.1016/j.elecom.2009.04.001

Cited by 87 publications

(67 citation statements)

References 22 publications

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“…on the carbon corrosion onset potential and on the amount of evolved CO 2 . [30][31][32][33][34][35][36] The impact of carbon corrosion under real operative conditions has also been investigated mainly in MEAs. [37][38][39] Among them few works focused on the carbon corrosion during extended cyclovoltammetry.…”

Section: Resultsmentioning

confidence: 99%

On the Need of Improved Accelerated Degradation Protocols (ADPs): Examination of Platinum Dissolution and Carbon Corrosion in Half-Cell Tests

Pizzutilo

Geiger

Grote

et al. 2016

J. Electrochem. Soc.

132

150

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In this work we employ the advanced scanning flow cell based analytical techniques, viz. inductively coupled plasma mass spectrometry (SFC-ICP-MS) and on-line electrochemical mass-spectrometry (SFC-OLEMS) to directly detect the amounts of dissolved platinum and evolved carbon dioxide in two protocols that are commonly used in the fuel cell community to simulate load cycle and start-stop conditions in proton exchange membrane fuel cells (PEMFCs). In contrast to previous assumptions, claiming a separation between carbon corrosion and platinum dissolution, in both standard protocols platinum dissolution and carbon corrosion are present at low rates, which is also reflected by a comparably low ECSA decrease. On the other hand, a huge increase in rate of both processes is observed during transitions from low to high potential regimes experienced by a PEMFC in operation, here studied in a third protocol covering the whole potential range from 0.6 to 1.5 V RHE . The latter is typically not addressed in literature. This finding is explained by taking into account platinum catalyzed carbon corrosion and transient platinum dissolution. Based on the obtained results, the question is raised on the practical adequacy of the standard protocols for differentiation of degradation processes and simulation of the degradation processes occurring in PEMFCs.

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Section: Resultsmentioning

confidence: 99%

On the Need of Improved Accelerated Degradation Protocols (ADPs): Examination of Platinum Dissolution and Carbon Corrosion in Half-Cell Tests

Pizzutilo

Geiger

Grote

et al. 2016

J. Electrochem. Soc.

132

150

View full text Add to dashboard Cite

show abstract

“…During the start-up/shutdown process, the potential can reach as high as 1.5 V vs. RHE (reversible hydrogen electrode), significantly higher than the carbon oxidation potential. These electrode potentials facilitate carbon oxidation through reaction (1). Furthermore, the presence of Pt and/or high temperature operation of the PEM fuel cell can accelerate carbon oxidation/corrosion.…”

Section: Introductionmentioning

confidence: 99%

“…To address this challenge, one approach is to reduce carbon support corrosion by hybridizing the support materials or replacing some of the carbon content using non-carbon materials. With respect to this, intensive research has been done with a focus on the corrosion mechanism of carbon support and its prevention in the most recent years [1][2][3].…”

Section: Introductionmentioning

confidence: 99%

Nanocrystalline tungsten carbide (WC) synthesis/characterization and its possible application as a PEM fuel cell catalyst support

Zhu

Ignaszak

Song

et al. 2012

Electrochimica Acta

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a b s t r a c tNanocrystalline tungsten carbide (WC) with a high surface area and containing minimal free carbon was synthesized via a polymer route. Its physical properties, including solubility in acid solution, electronic conductivity, and thermal stability, were thoroughly studied at two elevated temperatures: 95• C and 200• C. Compared to commercially available WC, this in-house synthesized WC showed lower solubility in acidic media at 200• C, higher electronic conductivity (comparable to that of carbon black), as well as higher thermal stability. However, this material exhibited low electrochemical stability in acidic media when subjected to potential cycling at potentials larger than 0.7 V vs. RHE, due to the electrooxidation of WC. The major product of WC electrooxidation is WO 3 , which was confirmed by X-ray photon spectroscopy measurements. Pt was uniformly deposited on the high surface area WC to form a 20 wt% of Pt supported catalyst for the oxygen reduction reaction (ORR). The ORR mass activity was then obtained using the rotating disk electrode technique.Crown

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“…Moreover, other catalyst supports [19,20] including inorganic compounds or composite supports have been used to mitigate the negative influence of carbon corrosion [21][22][23] on fuel cell performance.…”

Section: Introductionmentioning

confidence: 99%

Effects of Carbonization Temperature and Time during Carbon Riveting Process on the Stability of Pt/C Catalyst

et al. 2014

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Effects of carbonization temperature and time during carbon riveting process on the stability of Pt/C catalysts have been investigated systematically. X‐ray diffraction, transmission electron microscopy, cyclic voltammograms, and accelerated potential cycling tests have been performed to characterize the catalysts. The experimental results show that the activity of the riveted Pt/C catalyst decreases with the increasing of the heat‐treated temperature and the extension of heat‐treated time due to sintering of Pt nanoparticles. The stability of the carbon riveted Pt/C catalysts exhibits the increasing trend with the increase of the carbonization time and temperature. Considering both of the activity and stability of the riveted Pt/C catalysts, the optimized carbonization temperature and time are 400 °C and 60 min for a Pt/VulcanXC‐72 catalyst with starting particle size before carbonization of 2.2 nm and 20 wt% platinum loading, respectively.

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Investigation of Pt catalytic effects on carbon support corrosion of the cathode catalyst in PEM fuel cells using DEMS spectra

Cited by 87 publications

References 22 publications

On the Need of Improved Accelerated Degradation Protocols (ADPs): Examination of Platinum Dissolution and Carbon Corrosion in Half-Cell Tests

On the Need of Improved Accelerated Degradation Protocols (ADPs): Examination of Platinum Dissolution and Carbon Corrosion in Half-Cell Tests

Nanocrystalline tungsten carbide (WC) synthesis/characterization and its possible application as a PEM fuel cell catalyst support

Effects of Carbonization Temperature and Time during Carbon Riveting Process on the Stability of Pt/C Catalyst

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