Studies on the influence of palladium coatings on the electrochemical and structural properties of a metal hydride alloy

Ambrosio, Renato; Ticianelli, Edson A.

doi:10.1016/j.surfcoat.2004.07.087

Cited by 20 publications

(14 citation statements)

References 28 publications

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“…2c). Even though the primary transition for the Pd K edge spectrum is 1 s→5p, the final state often may have hybridization (mixing) with other orbitals, and the Pd K adsorption edge is known to reflect a change in d-band density due to the extent of 4d-5p hybridization [27][28][29] . The observed lower intensity in K edge may be derived from a decrease in the number of d-holes, resulting from the filling of the d-band vacancies by electrons from Au.…”

Section: Structure Of Pt ML /Pdau/c Electrocatalystmentioning

confidence: 99%

Highly stable Pt monolayer on PdAu nanoparticle electrocatalysts for the oxygen reduction reaction

et al. 2012

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stability is one of the main requirements for commercializing fuel cell electrocatalysts for automotive applications. Platinum is the best-known catalyst for oxygen reduction in cathodes, but it undergoes dissolution during potential changes while driving electric vehicles, thus hampering commercial adoption. Here we report a new class of highly stable, active electrocatalysts comprising platinum monolayers on palladium-gold alloy nanoparticles. In fuel-cell tests, this electrocatalyst with its ultra-low platinum content showed minimal degradation in activity over 100,000 cycles between potentials 0.6 and 1.0 V. under more severe conditions with a potential range of 0.6-1.4 V, again we registered no marked losses in platinum and gold despite the dissolution of palladium. These data coupled with theoretical analyses demonstrated that adding a small amount of gold to palladium and forming highly uniform nanoparticle cores make the platinum monolayer electrocatalyst significantly tolerant and very promising for the automotive application of fuel cells.

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Section: Structure Of Pt ML /Pdau/c Electrocatalystmentioning

confidence: 99%

Highly stable Pt monolayer on PdAu nanoparticle electrocatalysts for the oxygen reduction reaction

et al. 2012

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“…Pd addition results in lower charge/discharge overpotentials, lower charge transfer resistance and improved cycle life [25]. Modification of the alloys with the palladium also accelerates the activation process and enhances the ratecapability [24,26].…”

Section: Introductionmentioning

confidence: 99%

Electrochemical Behavior of a Pd Thin Film Electrode in Concentrated Alkaline Media

et al. 2017

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Pd limited volume electrodes (LVE) were obtained electrochemically from the PdCl 2 aqueous solution. Hydrogen absorption was performed using cyclic voltammetry and chronoamperometry in concentrated (6 M) alkaline solutions (KOH, NaOH, the mixture of 2M LiOH + 4M KOH) and results were compared with 0.5 M H 2 SO 4 . It was found that hydrogen pretreatment procedure is crucial for further examination of hydrogen absorption in Pd electrodes. After many cycles of hydrogen absorption/desorption in Pd, these processes become electrochemically more reversible-faster than in a freshly prepared electrode. Results obtained for Pd electrodes in different concentrated alkaline media subjected to hydrogen pretreatment procedure are comparable with those for an acidic solution (e.g., α→β phase transition potential equals to ca. 0.050 V vs. RHE). The continuous Pd electrode cycling does not affect significantly the amount of absorbed hydrogen (ca. 0.72-0.74). The surface roughness factor in basic solutions decreases after multiple hydrogen sorption as in case of an acidic solution.

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“…. [13][14][15] and a better understanding of the electroinsertion of hydrogen in low-dimensional and well defined Pd films is still required. For such studies, single crystalline supports can be used to prepare well defined epitaxial deposits [16][17][18].…”

Section: Introductionmentioning

confidence: 99%

Electrochemically elaborated palladium nanofilms on Pt(111): Characterization and hydrogen insertion study

Lebouin

Olivier

Sibert

et al. 2009

Journal of Electroanalytical Chemistry

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Studies on the influence of palladium coatings on the electrochemical and structural properties of a metal hydride alloy

Cited by 20 publications

References 28 publications

Highly stable Pt monolayer on PdAu nanoparticle electrocatalysts for the oxygen reduction reaction

Highly stable Pt monolayer on PdAu nanoparticle electrocatalysts for the oxygen reduction reaction

Electrochemical Behavior of a Pd Thin Film Electrode in Concentrated Alkaline Media

Electrochemically elaborated palladium nanofilms on Pt(111): Characterization and hydrogen insertion study

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