When cubic nanoparticles get spherical: An Identical Location Transmission Electron Microscopy case study with Pd in alkaline media

Zadick, Anicet; Dubau, Laëtitia; Zalineeva, Anna; Coutanceau, Christophe; Chatenet, Marian

doi:10.1016/j.elecom.2014.07.020

Cited by 30 publications

(33 citation statements)

References 12 publications

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“…These more aggregated catalysts reasonably cause the higher decay percentages. The obtained result showing more stable Pd nanocubes exposed in the solution with less OH À concentration is confirmed by a previous study [52], which reported that the morphology of cubic Pd nanoparticles can be remained after these nanocubes were experienced by a repeated CV test within a range of 0.4-0.9 V (vs. RHE) in a 0.1 M NaOH solution.…”

Section: Resultssupporting

confidence: 92%

Truncated palladium nanocubes: Synthesis and the effect of OH− concentration on their catalysis of the alkaline oxygen reduction reaction

Huang

Liu

Lee

2015

Electrochimica Acta

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Section: Resultssupporting

confidence: 92%

Truncated palladium nanocubes: Synthesis and the effect of OH− concentration on their catalysis of the alkaline oxygen reduction reaction

Huang

Liu

Lee

2015

Electrochimica Acta

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“…This technique represents a powerful tool to study [31][32][33][34][35][36] produced on the nanocatalyst layer under the conditions in which the voltammetric study is performed. With the aim of investigating the structural changes of faceted Pt nanoparticles during an intensive electrochemical potential cycling, the nanoparticles were deposited onto a carbon coated gold TEM grid.…”

Section: Introductionmentioning

confidence: 99%

Identical Location Transmission Electron Microscopy Imaging of Site-Selective Pt Nanocatalysts: Electrochemical Activation and Surface Disordering

Arán‐Ais

Yu²,

Hovden³

et al. 2015

J. Am. Chem. Soc.

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Abstract:We have employed Identical Location Transmission Electron Microscopy (IL-TEM) to study changes in the shape and morphology of faceted Pt nanoparticles as a result of the electrochemical cycling; a procedure typically employed for activating platinum surfaces. We find that the shape and morphology of the as-prepared hexagonal nanoparticles are rapidly degraded as a result of potential cycling up to +1.3 V. As few as 25 potential cycles are sufficient to cause significant degradation, and after about 500-1,000 cycles the particles are dramatically degraded. We also see clear evidence of particle migration during potential cycling. These finding suggest that great care must be exercised in the use and study of shaped Pt nanoparticles (and related systems) as electrocatlysts, especially for the oxygen reduction reaction (ORR) where high positive potentials are typically employed.

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“…The topography of bulk polycrystalline Pd has been shown to undergo remarkable changes during surface oxidation [32]. It has been shown recently that in alkaline media, where Pd is more stable, repetitive potential scanning changes the shape of cubic Pd nanoparticles to spherical [33]. Therefore scanning to more positive potentials was avoided in order to prevent the dissolution of Pd and resulting change of the shape and size of the PdNPs.…”

Section: Cyclic Voltammetry and Co Strippingmentioning

confidence: 99%

Oxygen electroreduction on carbon-supported Pd nanocubes in acid solutions

Erikson

Lüsi

Sarapuu

et al. 2016

Electrochimica Acta

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Please cite this article as: Heiki Erikson, Madis Lüsi, Ave Sarapuu, Kaido Tammeveski, Jose Solla-Gullón, Juan M.Feliu, Oxygen electroreduction on carbon-supported Pd nanocubes in acid solutions, Electrochimica Acta http://dx.doi.org/10.1016/j.electacta. 2015.11.125 This is a PDF file of an unedited manuscript that has been accepted for publication. As a service to our customers we are providing this early version of the manuscript. The manuscript will undergo copyediting, typesetting, and review of the resulting proof before it is published in its final form. Please note that during the production process errors may be discovered which could affect the content, and all legal disclaimers that apply to the journal pertain. Oxygen electroreduction on carbon-supported Pd nanocubes in acid solutions Highlights• Carbon-supported Pd nanocubes of three different size and loading were prepared• The specific activity for oxygen reduction reaction is independent of Pd content• Pd nanocubes possess higher specific activity for ORR than spherical Pd nanoparticles• The ORR on carbon-supported Pd nanocubes proceed mainly via 4-electron pathway• Tafel behaviour of ORR on carbon-supported Pd nanocubes is similar to that of bulk Pd AbstractThe oxygen reduction reaction (ORR) was studied on carbon-supported cubic palladium nanoparticles of different sizes (~30 nm, ~10 nm and ~7 nm). Cetyltrimethylammonium bromide (CTAB) and polyvinylpyrrolidone (PVP) were used as capping agents to prepare the nanocubes and Pd content in the catalyst samples was 20 and 50 wt%. The surface morphology of the prepared materials was studied by transmission electron microscopy (TEM). The catalyst materials were electrochemically characterised by cyclic voltammetry and CO stripping experiments. The rotating disk electrode (RDE) method was employed for ORR studies in 0.5 M H 2 SO 4 and 0.1 M HClO 4 solutions. The ORR results revealed that the specific activity of cubic Pd nanoparticles is higher than that of spherical Pd particles and does not depend on the Pd content in the catalyst, but decreases with decreasing the size of Pd nanocubes. Mass activity of Pd nanocubes increased with decreasing the particle size. The ORR proceeds mainly via 4-electron pathway and the reaction mechanism is similar to that on bulk Pd.

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When cubic nanoparticles get spherical: An Identical Location Transmission Electron Microscopy case study with Pd in alkaline media

Cited by 30 publications

References 12 publications

Truncated palladium nanocubes: Synthesis and the effect of OH− concentration on their catalysis of the alkaline oxygen reduction reaction

Truncated palladium nanocubes: Synthesis and the effect of OH− concentration on their catalysis of the alkaline oxygen reduction reaction

Identical Location Transmission Electron Microscopy Imaging of Site-Selective Pt Nanocatalysts: Electrochemical Activation and Surface Disordering

Oxygen electroreduction on carbon-supported Pd nanocubes in acid solutions

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