X-ray photoelectron spectroscopy investigation on electrochemical degradation of proton exchange membrane fuel cell electrodes

Andersen, Shuang Ma; Dhiman, Rajnish; Skou, Eivind Morten

doi:10.1016/j.jpowsour.2015.02.004

Cited by 18 publications

(9 citation statements)

References 32 publications

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“…For the other two elements in Table 2, i. e., Pt and O, a slightly increase of Pt content is noticed in the degraded Pt/C cell. This observation agrees with the previous investigation [38] . The increase of Pt content could be due to the oxidation of carbon that leaves more platinum exposed on the surface.…”

Section: Resultssupporting

confidence: 93%

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An Experimental Investigation of the Effect of Platinum on the Corrosion of Cathode Carbon Support in a PEMFC

Liu

Gao

et al. 2022

ChemSusChem

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The possible role of platinum in the carbon corrosion at cell voltage higher than 1.0 V is controversial yet. To gain more insights into this issue, a square-wave potential cycles between 1.0 to 1.5 V was applied to fuel cells comprising cathodes with and without Pt. Using online non-dispersive infrared spectroscopy, we showed that Pt catalyzed the gasification of carbon in the early stage, while upon prolonged exposure to potential cycling (� 3 h), platinum started to hinder the CO 2 production. Based on cyclic voltammetry tests and Raman spectroscopy, the inhibiting effect of platinum on the corrosion was suggested to originate from modifications on carbon surface, where the formation of electroactive sites was limited. Electrode and nonelectrode ohmic resistances were distinguished further through electrochemical impedance spectroscopy measurement and the changes in electrode microstructure and surface composition were examined by scanning electron microscope image and energy dispersion X-Ray spectroscopy. The results indicated that Pt reduced the damage of electrode structures after potential cycles.That Pt catalyzed carbon corrosion below 1.0 V is always observed and widely accepted. [8,10,11] However, the catalytic role [a] F.

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Section: Resultssupporting

confidence: 93%

“…This observation agrees with the previous investigation. [38] The increase of Pt content could be due to the oxidation of carbon that leaves more platinum exposed on the surface. However, for O element, a reduction in O content is seen in both the degraded Pt/C and PCL cell.…”

Section: Chemsuschemmentioning

confidence: 99%

An Experimental Investigation of the Effect of Platinum on the Corrosion of Cathode Carbon Support in a PEMFC

Liu

Gao

et al. 2022

ChemSusChem

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“…[32][33][34] We have also earlier reported state-of-the-art electrode interface structure intensively characterized with XPS. [35][36] However, for the practical Pt/C catalysts, presence of surface oxides (Pt-O) makes it difficult to differentiate between various ionomer/catalyst interactions. Electrochemical techniques employed to evaluate the electrode performance, on the other hand, may also supplement the structural characterizations.…”

Section: Introductionmentioning

confidence: 99%

“…Further, mapping the ionomer distribution on carbon using microscopy techniques relying on energetic charged particles is difficult because of the poor contrast between carbon and Nafion phases and the possibility of changed ionomer distribution during sample preparation and/or measurement processes. Again, as the formation of TPB depends on the ionomer distribution and the chain orientation as well, spectroscopic techniques are frequently explored to investigate the ionomer adsorption behavior on catalyst and/or support. − Physico-chemical methods such as X-ray photoelectron spectroscopy (XPS) have also been employed for ionomer degradation and/or ionomer/catalyst interface studies. − We have also earlier reported state-of-the-art electrode interface structure intensively characterized with XPS. , However, for the practical Pt/C catalysts, the presence of surface oxides (Pt/O) makes it difficult to differentiate between various ionomer/catalyst interactions. Electrochemical techniques employed to evaluate the electrode performance, on the other hand, may also supplement the structural characterizations.…”

Section: Introductionmentioning

confidence: 99%

Zoom in Catalyst/Ionomer Interface in Polymer Electrolyte Membrane Fuel Cell Electrodes: Impact of Catalyst/Ionomer Dispersion Media/Solvent

Sharma

Andersen

2018

ACS Appl. Mater. Interfaces

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Large-scale applications of polymer electrolyte membrane fuel cells (PEMFCs), are throttled primarily by high initial cost and durability issues of the electrodes, which essentially consist of the nanoparticulate catalysts (e. g. Pt) having accessibility to electrons (e-), protons (H +) and fuel/oxidant through catalyst support, polymer electrolyte ionomer and porous gas diffusion layer, respectively. Hence, to achieve high electrode performance in terms of activity and/or durability, understanding and optimization of the catalyst/support and catalyst/ionomer interfaces is of significant importance. Present study demonstrates an alternative route to inspect the catalyst/ionomer interface through accelerated stress test (AST) combined with electrochemical impedance spectroscopy (EIS). Various interface is created through catalyst inks prepared using commercial Pt/C catalyst powder dispersed in different solvents. Electrode degradation pattern turns out to be a very useful tool to interpret catalyst/ionomer interface structure. Variations of interfacial impedance, electrochemical surface area (ECSA) and double layer capacitance (DLC) with the number of potential cycles suggested significant impact of catalyst/ionomer interface on the catalyst performance. A quantification of the degradation mechanisms responsible for ECSA loss during AST was employed to further understand the correlations between the electrochemical

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“…Attention has been given to study degradation and its minimization in fuel cells and electrolysers individually [9][10][11][12][13][14][15][16][17][18][19][20][21] viz. Jing Shan et al [22] investigated the degradation of PEMFC using their own cyclic tests designed along with current density distribution system after each cycle.…”

Section: Introductionmentioning

confidence: 99%

Root cause analysis of the degradation in a unitized regenerative fuel cell

Bhosale

Meenakshi

Ghosh

2017

Journal of Power Sources

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______________________________________________________________________________ The present study emphasizes the possible modes of failure of a unitized regenerative fuel cell (URFC) when operated in fuel cell as well as in electrolysis mode at different temperatures viz. 30 C and 60 C. The carbon based catalyst (Pt/C) and diffusion layers are used to characterize the degradation of the URFCs. The electrolysis mode of operation is found to dominate the root cause of failure with increase in temperature. Agglomeration and loss of catalyst along with delamination of electrode from membrane are observed. Membrane degradation owing to it's structural as well as chemical damage is seen to be prominent at higher temperature. Characterization techniques such as SEM, TEM and ICP-AES confirm the study showcasing the effect.

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X-ray photoelectron spectroscopy investigation on electrochemical degradation of proton exchange membrane fuel cell electrodes

Cited by 18 publications

References 32 publications

An Experimental Investigation of the Effect of Platinum on the Corrosion of Cathode Carbon Support in a PEMFC

An Experimental Investigation of the Effect of Platinum on the Corrosion of Cathode Carbon Support in a PEMFC

Zoom in Catalyst/Ionomer Interface in Polymer Electrolyte Membrane Fuel Cell Electrodes: Impact of Catalyst/Ionomer Dispersion Media/Solvent

Root cause analysis of the degradation in a unitized regenerative fuel cell

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