Formation of a higher palladium oxide in the oxygen evolution potential range

Chausse, Víctor; Regull, Pedro; Victori, L.

doi:10.1016/0022-0728(87)85169-0

Cited by 44 publications

(17 citation statements)

References 39 publications

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“…In the literature two Pd reduction peaks are reported: (i) a well-defined reduction peak at lower potentials labeled here as C1 (Figure 1) that corresponds to the reduction of Pd(II)-oxide (equation 1-1b) and (ii) a second broad reduction peak around 1.2-1.3 VRHE (here, C2), which is thought to correspond to the reduction of Pd(IV)-oxide formed at high potentials (>1.3 VRHE), slightly below the OER onset [30,63] (equation 2-2b). This higher oxidation state was confirmed with XPS measurement by Chausse et al [73]. Zhang et al and Birrs et al showed independently that a thick Pd "β hydrous oxide" [62,65,74] is only formed at very large anodic polarization (higher than the OER onset) and its reduction is correlated to several peaks in the low potential region, around HUPD [30,32,65].…”

Section: Discussionsupporting

confidence: 55%

Palladium electrodissolution from model surfaces and nanoparticles

Pizzutilo

Geiger

Freakley

et al. 2017

Electrochimica Acta

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Palladium (Pd) is considered as a possible candidate as catalyst for proton exchange membrane fuel cells (PEMFCs) due to its high activity and affordable price compared to platinum (Pt). However, the stability of Pd is known to be limited, yet still not fully understood. In this work, Pd dissolution is studied in acidic media using an online inductively coupled plasma mass spectrometry (ICP-MS) in combination with an electrochemical scanning flow cell (SFC). Crucial parameters influencing dissolution like potential scan rate, upper potential limit (UPL) and electrolyte composition are studied on a bulk polycrystalline Pd (poly -Pd). Furthermore, a comparison with a supported high -surface area catalyst is carried out for its potential use in industrial applications. For this aim, a carbon supported Pd nanocatalyst (Pd/C) is synthesized and its performance is compared with that of bulk poly -Pd. Our results evidence that the transient dissolution is promoted by three main contributions (one anodic and two cathodic). At potentials below 1.5 VRHE the anodic dissolution is the dominating mechanism, whereas at higher potentials the cathodic mechanisms prevail. On the basis of the obtained results, a model is thereafter proposed to explain the transient Pd dissolution.(C) 2017 Elsevier Ltd. All rights reserved

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Section: Discussionsupporting

confidence: 55%

Palladium electrodissolution from model surfaces and nanoparticles

Pizzutilo

Geiger

Freakley

et al. 2017

Electrochimica Acta

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“…In this context, at Pd/HDA/C@air-ht catalyst the peak observed at ca. 0.58 V/RHE, could be attributed to the reduction of PdO2 species [86,87], see inset in Figure S2. In addition, the current magnitude of those redox-peaks is slightly higher for Pd/HDA/C@air-ht catalyst in comparison to that observed with its counterparts.…”

Section: Zones I -Iimentioning

confidence: 93%

Pd and Pd@PdO core–shell nanoparticles supported on Vulcan carbon XC-72R: comparison of electroactivity for methanol electro-oxidation reaction

et al. 2019

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“…On the other hand, highly electronegative fluorine ligands reportedly can produce ϩ5 and ϩ6 oxidation states in inorganic Pd compounds, although such species are unstable and have not been well characterized (7,8). Electrochemical formation of PdO 3 is also suggested (9). It is also known that more electropositive ligands such as hydride and silyl ligands can form stable transition-metal compounds with high formal oxidation states such as K 2 Re VII H 9 , (Me 5 C 5 )Ir V H 4 , and (Me 5 C 5 )M V (H) 2 (SiEt 3 ) 2 (M ϭ Co, Rh, Ir) (10)(11)(12)(13)(14).…”

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confidence: 99%