The Crystalline Structure of Pt3O4

Galloni, Ernesto E.; Roffo, Angel E.

doi:10.1063/1.1750860

Cited by 36 publications

(7 citation statements)

References 6 publications

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“…Broad and low-intensity peak between 10.0° and 37.0° was previously reported for GONRs treated with NaBH 4 [28] and for electrochemically produced Pt NPs shell decorating graphene (Pt NPs@G) from Pt NPs@GO [44]. The presence of Pt oxides [45,46] and residual graphene oxides results in several low intensity peaks between 10.0° and 37.0°.…”

Section: Figurementioning

confidence: 60%

Understanding the Influence of the Biomass-Derived Alcohols on the Activity and Stability of Pt Nanoparticles Supported on Graphene Nanoribbons

et al. 2017

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We produced Pt/GNRs by a one-step synthesis procedure and evaluated their electroactivity and stability towards glycerol electrooxidation reaction (GEOR) for the first time. We compared the electrocatalytic performance of GEOR with methanol and ethanol electrooxidation on Pt/GNRs at identical experimental conditions. The activities and stabilities for these biomass-derived alcohols electrooxidation on Pt/GNRs were compared to commercial Pt/C. The synthesis of the Pt/GNRs was confirmed by transmission electron microscopy, x-ray diffractometry, ultraviolet spectrophotometry and Raman spectroscopy. We found that the activities of Pt/GNRs for these reactions are comparable to Pt/C, with improvement in terms of current density for methanol electrooxidation. Comparing potentiostatic measurements, we found that glycerol produces lower pseudo-stationary current densities than ethanol and methanol on both catalysts, with greatest values found for methanol electrooxidation on Pt/C. Otherwise, the GNRs remarkably enhance the stability of the catalyst for all the reactions, by increasing the stability of the current density during successive potential cycles, and by preventing the loss of electrochemically active surface area by avoiding carbon corrosion and Pt detachment. Moreover, we showed that the stability of the NPs depends on the biomass-derived alcohol used. The solution containing methanol reveals itself the most aggressive electrochemical environment to the catalyst, impacting in the decrease of surface area, while glycerol is less aggressive. Hence, the different products formed at the interface electrode / solution might lead to different electrochemical environment, which plays an important role on the stability of the catalysts.

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Section: Figurementioning

confidence: 60%

Understanding the Influence of the Biomass-Derived Alcohols on the Activity and Stability of Pt Nanoparticles Supported on Graphene Nanoribbons

et al. 2017

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“…We first report the finding of giant SHE in BCC-Pt 3 O 4 . Pt 3 O 4 has two possible proposed crystal structures (27), body centered cubic (BCC) (28) and simple cubic (SC) (29). BCC-Pt 3 O 4 consists of Pt atoms surrounded by a cubic oxygen crystal field, while SC-Pt 3 O 4 has Pt atoms inside a square planar crystal field.…”

Section: Applied Physical Sciencesmentioning

confidence: 99%

Rational design principles for giant spin Hall effect in 5d -transition metal oxides

Jadaun

Banerjee

2020

Proc. Natl. Acad. Sci. U.S.A.

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Spin Hall effect (SHE), a mechanism by which materials convert achargecurrent into aspincurrent, invokes interesting physics and promises to empower transformative, energy-efficient memory technology. However, fundamental questions remain about the essential factors that determine SHE. Here, we solve this open problem, presenting a comprehensive theory of five rational design principles for achievinggiantintrinsic SHE in transition metal oxides. Arising from our key insight regarding the inherently geometric nature of SHE, we demonstrate that two of these design principles are weak crystal fields and the presence of structural distortions. Moreover, we discover that antiperovskites are a highly promising class of materials for achieving giant SHE, reaching SHE values anorder of magnitudelarger than that reported for any oxide. Additionally, we derive three other design principles for enhancing SHE. Our findings bring deeper insight into the physics driving SHE and could help enhance and externally control SHE values.

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“…44,45 The existence of the isostructural and isoelectronic monoxide of platinum, PtO, has been questioned in the literature. 38,46,47 Similarly, the binary compound Pt 3 O 4 has been a topic of contention, 38,[48][49][50] though a variety of ternary phases that display the Pt 3 O 4 topology are known. 51,52 It is important to stress that the tendency to be fully reduced to the metallic state is so strong for the precious metals that oxides of lower valence are effectively never observed upon dissociation of bulk materials at ambient pressure.…”

Section: Oxide Crystal Chemistry Of the Platinum Groupmentioning

confidence: 99%

Chemistry of precious metal oxides relevant to heterogeneous catalysis

2013

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The platinum group metals (PGMs) are widely employed as catalysts, especially for the mitigation of automotive exhaust pollutants. The low natural abundance of PGMs and increasing demand from the expanding automotive sector necessitates strategies to improve the efficiency of PGM use. Conventional catalysts typically consist of PGM nanoparticles dispersed on high surface area oxide supports. However, high PGM loadings must be used to counter sintering, ablation, and deactivation of the catalyst such that sufficient activity is maintained over the operating lifetime. An appealing strategy for reducing metal loading is the substitution of PGM ions into oxide hosts: the use of single atoms (ions) as catalytic active sites represents a highly atom-efficient alternative to the use of nanoparticles. This review addresses the crystal chemistry and reactivity of oxide compounds of precious metals that are, or could be relevant to developing an understanding of the role of precious metal ions in heterogeneous catalysis. We review the chemical conditions that facilitate stabilization of the notoriously oxophobic precious metals in oxide environments, and survey complex oxide hosts that have proven to be amenable to reversible redox cycling of PGMs.

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The Crystalline Structure of Pt3O4

Cited by 36 publications

References 6 publications

Understanding the Influence of the Biomass-Derived Alcohols on the Activity and Stability of Pt Nanoparticles Supported on Graphene Nanoribbons

Understanding the Influence of the Biomass-Derived Alcohols on the Activity and Stability of Pt Nanoparticles Supported on Graphene Nanoribbons

Rational design principles for giant spin Hall effect in 5d -transition metal oxides

Chemistry of precious metal oxides relevant to heterogeneous catalysis

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