Surfactant modified platinum based fuel cell cathode studied by X-ray absorption spectroscopy

Melke, Julia; Dixon, Ditty; Riekehr, Lars; Benker, Nathalie; Langner, Joachim; Lentz, Claudia; Sezen, Hikmet; Nefedov, Alexei; Wöll, Christof; Ehrenberg, Helmut; Roth, Christina

doi:10.1016/j.jcat.2018.05.024

Cited by 2 publications

(1 citation statement)

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“…The Δμ was obtained by subtracting the The potential of 450 mV versus RHE has been used in similar half-cell experiments previously for the determination of Δμ. 13,25,26 Δμ XANES was evaluated in the range from −20 to 30 eV relative to the Pt L 3 edge (11 564 eV).…”

Section: Gde Preparationmentioning

confidence: 99%

Following Adsorbed Intermediates on a Platinum Gas Diffusion Electrode in H₃PO₃-Containing Electrolytes Using In Situ X-ray Absorption Spectroscopy

et al. 2022

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One of the challenges of high-temperature polymer electrolyte membrane fuel cells is the poisoning of the Pt catalyst with H3PO4. H3PO4 is imbibed into the routinely used polybenzimidazole-based membranes, which facilitate proton conductivity in the temperature range of 120–200 °C. However, when leached out of the membrane by water produced during operation, H3PO4 adsorbs on the Pt catalyst surface, blocking the active sites and hindering the oxygen reduction reaction (ORR). The reduction of H3PO4 to H3PO3, which occurs at the anode due to a combination of a low potential and the presence of gaseous H2, has been investigated as an additional important contributing factor to the observed poisoning effect. H3PO3 has an affinity toward adsorption on Pt surfaces even greater than that of H2PO4 –. In this work, we investigated the poisoning effect of both H3PO3 and H3PO4 using a half-cell setup with a gas diffusion electrode under ambient conditions. By means of in situ X-ray absorption spectroscopy, it was possible to follow the signature of different species adsorbed on the Pt nanoparticle catalyst (H, O, H2PO4 –, and H3PO3) at different potentials under ORR conditions in various electrolytes (HClO4, H3PO4, and H3PO3). It was found that H3PO3 adsorbs in a pyramidal configuration P(OH)3 through a Pt–P bond. The competition between H3PO4 and H3PO3 adsorption was studied, which should allow for a better understanding of the catalyst poisoning mechanism and thus assist in the development of strategies to mitigate this phenomenon in the future by minimizing H3PO3 generation by, for example, improved catalyst design or adapted operation conditions or changes in the electrolyte composition.

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Section: Gde Preparationmentioning

confidence: 99%

Following Adsorbed Intermediates on a Platinum Gas Diffusion Electrode in H₃PO₃-Containing Electrolytes Using In Situ X-ray Absorption Spectroscopy

et al. 2022

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Effect of dodecylbenzenesulphonate on Electrocatalytic Activity of NiOx Nanoparticles for glucose oxidation

Ahmed¹

2019

International Journal of Electrochemical Science

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The impacts of addition of organic compound (anionic surfactant) dodecylbenzenesulphonate (DBS) on the electrodeposition of nickel oxide (NiOx) nanoparticles and on the electrocatalytic oxidation of glucose from alkaline solution are studied. NiOx nanoparticles are electrodeposited on the surface of a glassy carbon (GC) electrode in the presence and absence of the DBS. Cyclic voltammetry (CV), field emission-scanning electron microscopy (SEM) and energy dispersive X-ray spectroscopy (EDX) are used for characterization of the above electrodes. The peak current of the redox couple Ni(II)/Ni(III) increases with the [DBS] before it decreases at [DBS] > 1×10-4 M. The electrocatalytic activity of the NiOx/GC electrode towards the electrochemical oxidation of glucose is affected by the same manner. An attempt to correlate this electrocatalytic enhancement with the addition of the DBS is introduced. Optimum concentration of the DBS is obtained that gives the best enhancement in the electrochemical and electrocatalytic properties.

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Surfactant modified platinum based fuel cell cathode studied by X-ray absorption spectroscopy

Cited by 2 publications

References 45 publications

Following Adsorbed Intermediates on a Platinum Gas Diffusion Electrode in H₃PO₃-Containing Electrolytes Using In Situ X-ray Absorption Spectroscopy

Following Adsorbed Intermediates on a Platinum Gas Diffusion Electrode in H₃PO₃-Containing Electrolytes Using In Situ X-ray Absorption Spectroscopy

Effect of dodecylbenzenesulphonate on Electrocatalytic Activity of NiOx Nanoparticles for glucose oxidation

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Surfactant modified platinum based fuel cell cathode studied by X-ray absorption spectroscopy

Cited by 2 publications

References 45 publications

Following Adsorbed Intermediates on a Platinum Gas Diffusion Electrode in H3PO3-Containing Electrolytes Using In Situ X-ray Absorption Spectroscopy

Following Adsorbed Intermediates on a Platinum Gas Diffusion Electrode in H3PO3-Containing Electrolytes Using In Situ X-ray Absorption Spectroscopy

Effect of dodecylbenzenesulphonate on Electrocatalytic Activity of NiOx Nanoparticles for glucose oxidation

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Following Adsorbed Intermediates on a Platinum Gas Diffusion Electrode in H₃PO₃-Containing Electrolytes Using In Situ X-ray Absorption Spectroscopy

Following Adsorbed Intermediates on a Platinum Gas Diffusion Electrode in H₃PO₃-Containing Electrolytes Using In Situ X-ray Absorption Spectroscopy