Dissolution of Platinum Single Crystals in Acidic Medium

Sandbeck, Daniel J. S.; Brummel, Olaf; Mayrhofer, Karl Johann Jakob; Libuda, Jörg; Katsounaros, Ioannis; Cherevko, Serhiy

doi:10.1002/cphc.201900866

Cited by 47 publications

(49 citation statements)

References 68 publications

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“…[2][3][4][5][6][7][8][9][10][11] Some such studies followed these processes with potential cycling, where it is known that the surface restructuring over many cycles leads to a roughened surface, and that dissolution is enhanced during oxide reduction. [12][13][14][15][16][17][18][19][20][21][22] Explanation of this behaviour generally invokes a place exchange (PE) process, in which a Pt surface atom leaves its lattice site and oxygen penetrates into the metal lattice. On Pt(111), pioneering studies demonstrated that PE can be directly observed by surface X-ray diffraction (SXRD).…”

Section: Introductionmentioning

confidence: 99%

Structure dependency of the atomic-scale mechanisms of platinum electro-oxidation and dissolution

et al. 2020

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Platinum dissolution and restructuring due to surface oxidation are primary degradation mechanisms that limit the lifetime of Pt-based electrocatalysts for electrochemical energy conversion. Here, we studied welldefined Pt(100) and Pt(111) electrode surfaces by in situ high-energy surface X-ray diffraction, on-line inductively coupled plasma mass spectrometry, and density functional theory calculations, to elucidate the atomicscale mechanisms of these processes. The locations of the extracted Pt atoms after Pt(100) oxidation reveal distinct differences from the Pt(111) case, which explains the different surface stability. The evolution of a specific stripe oxide structure on Pt(100) produces unstable surface atoms which are prone to dissolution and restructuring, leading to one order of magnitude higher dissolution rates.

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Section: Introductionmentioning

confidence: 99%

Structure dependency of the atomic-scale mechanisms of platinum electro-oxidation and dissolution

et al. 2020

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“…Potential cycling leads to reproducible full range CVs. However, the surface atom arrangement is changed by the oxidation 59 and dissolution and redeposition changes the surface atom arrangement 60,61 , while different surface sites of single crystals come with different dissolution rates 62 . The surface atom rearrangement due to oxidation and dissolution above 0.8 V also changes the hydrogen adsorption profile 42,63 .…”

Section: Full Range CV Datamentioning

confidence: 99%

The Role of the Double Layer for the Pseudocapacitance of the Hydrogen Adsorption on Platinum

Schalenbach

Durmus

Tempel

et al. 2022

Preprint

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Pseudocapacitances such as the hydrogen adsorption on platinum (HAoPt) are associated with faradaic chemical processes that appear as capacitive in their potentiodynamic response, which was reported to result from the kinetics of adsorption processes. This study discusses an alternative interpretation of the partly capacitive response of the HAoPt that is based on the proton transport of ad- or desorbed hydrogen in the double layer. Potentiodynamic perturbations of equilibrated surface states of the HAoPt lead to typical double layer responses with the characteristic resistive-capacitive relaxations that overshadow the fast adsorption kinetics. A potential-dependent double layer representation by a dynamic transmission line model incorporates the HAoPt in terms of capacitive contributions and can computationally reconstruct the charge exchanged in full range cyclic voltammetry data. The coupling of charge transfer with double layer dynamics displays a novel physicochemical theory to explain the phenomenon of pseudocapacitance and the mechanisms in thereon based supercapacitors.

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“…This was rationalized by the average CN of ions on each of these faces, where faces with lower CNs (namely the (110) and (111) faces) were etched more quickly than the (100) faces [ 84 ]. Conversely, it is hypothesized that octahedral shaped NPs exposing Pt(111) facets dissolve less than cubic shapes exposing Pt(100) facets in acidic environments [ 85 ]. The role of facet-dependent dissolution and bactericidal activity of NPs was also investigated.…”

Section: Surface Nanotopography Of Nms In Relation To Their Biological Activitiesmentioning

confidence: 99%

Importance of Surface Topography in Both Biological Activity and Catalysis of Nanomaterials: Can Catalysis by Design Guide Safe by Design?

Gulumian

Afantitis

Puzyn

et al. 2021

IJMS

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It is acknowledged that the physicochemical properties of nanomaterials (NMs) have an impact on their toxicity and, eventually, their pathogenicity. These properties may include the NMs’ surface chemical composition, size, shape, surface charge, surface area, and surface coating with ligands (which can carry different functional groups as well as proteins). Nanotopography, defined as the specific surface features at the nanoscopic scale, is not widely acknowledged as an important physicochemical property. It is known that the size and shape of NMs determine their nanotopography which, in turn, determines their surface area and their active sites. Nanotopography may also influence the extent of dissolution of NMs and their ability to adsorb atoms and molecules such as proteins. Consequently, the surface atoms (due to their nanotopography) can influence the orientation of proteins as well as their denaturation. However, although it is of great importance, the role of surface topography (nanotopography) in nanotoxicity is not much considered. Many of the issues that relate to nanotopography have much in common with the fundamental principles underlying classic catalysis. Although these were developed over many decades, there have been recent important and remarkable improvements in the development and study of catalysts. These have been brought about by new techniques that have allowed for study at the nanoscopic scale. Furthermore, the issue of quantum confinement by nanosized particles is now seen as an important issue in studying nanoparticles (NPs). In catalysis, the manipulation of a surface to create active surface sites that enhance interactions with external molecules and atoms has much in common with the interaction of NP surfaces with proteins, viruses, and bacteria with the same active surface sites of NMs. By reviewing the role that surface nanotopography plays in defining many of the NMs’ surface properties, it reveals the need for its consideration as an important physicochemical property in descriptive and predictive toxicology. Through the manipulation of surface topography, and by using principles developed in catalysis, it may also be possible to make safe-by-design NMs with a reduction of the surface properties which contribute to their toxicity.

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Dissolution of Platinum Single Crystals in Acidic Medium

Cited by 47 publications

References 68 publications

Structure dependency of the atomic-scale mechanisms of platinum electro-oxidation and dissolution

Structure dependency of the atomic-scale mechanisms of platinum electro-oxidation and dissolution

The Role of the Double Layer for the Pseudocapacitance of the Hydrogen Adsorption on Platinum

Importance of Surface Topography in Both Biological Activity and Catalysis of Nanomaterials: Can Catalysis by Design Guide Safe by Design?

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