Cyclic voltammetry and oxygen reduction activity of the Pt{110}-(1×1) surface

Attard, Gary Anthony; Brew, Ashley

doi:10.1016/j.jelechem.2015.04.017

Cited by 44 publications

(57 citation statements)

References 35 publications

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“…Moreover, the electrocatalytic activity towards the oxygen reduction reaction (ORR) was found to differ significantly from previous reports which asserted that Pt{110} electrodes exhibit ORR activity equivalent to or greater than that of Pt{111} in aqueous perchloric acid [4][5][6][7][8]. Rather, in reference [1], when all defects were eliminated from the electrode surface via CO cooling, ORR activity in aqueous perchloric acid was found unequivocally to be lower than that of Pt{111}. Hence, we are undertaking an extensive re-evaluation of previous electrocatalytic studies involving Pt{110} and related surfaces since nearly all of these earlier investigations involved a flame-anneal/ hydrogen cooling surface preparation protocol leading to the generation of defective surfaces [9][10][11][12][13][14][15].…”

Section: Introductioncontrasting

confidence: 66%

“…In a recent paper [1], the voltammetry of Pt{110} in aqueous perchloric acid and sodium hydroxide was reported. In agreement with previous studies [2,3], depending on the cooling environment after flame annealing, the surface of the electrode could be prepared in a partial (1 × 2) (nitrogen-cooled), (1 × 1) (CO-cooled) or "rough" (1 × 1) (hydrogen-cooled) state.…”

Section: Introductionmentioning

confidence: 99%

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The voltammetry of surfaces vicinal to Pt{110}: Structural complexity simplified by CO cooling

Attard

Hunter

Wright

et al. 2017

Journal of Electroanalytical Chemistry

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By flame-annealing and cooling a series of Pt n{110} × {111} and Pt n{110} × {100} single crystal electrodes in a CO ambient, new insights into the nature of the electrosorption processes associated with Pt{110} voltammetry in aqueous acidic media are elucidated. For Pt n{110} × {111} electrodes, a systematic change in the intensities of so-called hydrogen underpotential (Hupd) and oxide adsorption voltammetric peaks (for two dimensionally ordered (1 × 1) terraces and linear {111} × {111}step sites) point to a lack of surface reconstruction with all surfaces adopting a (1 × 1) configuration. This is in contrast to hydrogen cooled analogues which give rise to significant residual surface disorder, probably associated with the excess 50% of atoms remaining atop of the surface upon deconstruction of the {110} − (1 × 2) terrace phase. In contrast, Pt n{110} × {100} stepped electrodes, when cooled in gaseous CO following flame-annealing, show a marked tendency towards surface reconstruction, even at low step densities. Variations in potential of the Pt{110}-(1 × 1) Hupd electrosorption peaks as a function of specific ion adsorption strength and pH point to weak specific adsorption for both anions (including perchlorate and fluoride) and cations (including Na + and K +). CO charge-displacement measurements of the potential of zero total charge (PZTC) allow inferences to be made concerning the nature of the electrosorbed species in the hydrogen underpotential deposition (Hupd) region. Hence, a coherent interpretation of the complex voltammetric phenomena often displayed by platinum surfaces vicinal to the {110} plane is proposed.

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Section: Introductioncontrasting

confidence: 66%

Section: Introductionmentioning

confidence: 99%

The voltammetry of surfaces vicinal to Pt{110}: Structural complexity simplified by CO cooling

Attard

Hunter

Wright

et al. 2017

Journal of Electroanalytical Chemistry

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“…3 predicts that pristine Pt(110) (denoted p-Pt(110)) is not active for the ORR. However, it is well known that Pt(110) reconstructs under electrochemical conditions 47–50 in a missing-row fashion (see Fig. S8†).…”

Section: Resultsmentioning

confidence: 99%

“…This coincides with recent measurements by Attard and Brew, who found the following ORR activity ordering: p-Pt(110) < Pt(111) < r-Pt(110). 50 …”

Section: Resultsmentioning

confidence: 99%

Why conclusions from platinum model surfaces do not necessarily lead to enhanced nanoparticle catalysts for the oxygen reduction reaction

et al. 2017

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“…The O2 reduction activity of Pt(110)-(1 × 1) was found to be lower than that of disordered Pt(110)-(1 × 2) in 0.1 M HClO4 by 30-40 mV on the basis of the E1/2 value [16].…”

Section: Introductionmentioning

confidence: 84%

Loading effect of carbon-supported platinum nanocubes on oxygen electroreduction

Jukk

Kongi

Tammeveski

et al. 2017

Electrochimica Acta

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Loading effect of carbonsupported platinum nanocubes on oxygen electroreduction, Electrochimica Actahttp://dx. Graphical abstract Research highlights Cubic Pt nanoparticles are synthesised in the presence of oleylamine and oleic acid  Vulcan carbon is used as a support for cubic Pt nanoparticles with various loading  Pt/C catalysts revealed a high ORR activity in both acid and alkaline solutions  Pt/C catalysts showed similar specific and mass activity independently of Pt loading  Important methodological aspects regarding Pt/C catalyst testing are highlighted AbstractIn this work, Vulcan carbon-supported cube-shape Pt nanoparticles with various metal loadings were synthesised in the presence of oleylamine and oleic acid. Surface morphology of different Pt/C samples was examined by transmission electron microscopy (TEM) and their metal loading verified by thermogravimetric analysis (TGA). TEM micrographs showed Pt nanoparticles with a preferential cubic-shape and increased agglomeration of the particles with increasing Pt loading. Electrochemical characterisation of the Pt/C catalysts indicated that the resulting Pt nanoparticles present a preferential (100) surface structure. The electrocatalytic properties of the Pt/C catalysts of different metal loading were evaluated towards the oxygen reduction reaction (ORR) both in acidic and alkaline media employing the rotating disk electrode (RDE) configuration. Interestingly, similar specific and mass activities were found in both solutions revealing that the ORR activities were independent of the Pt loading and suggesting that all the Pt nanocubes contributed as isolated particles.

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Cyclic voltammetry and oxygen reduction activity of the Pt{110}-(1×1) surface

Cited by 44 publications

References 35 publications

The voltammetry of surfaces vicinal to Pt{110}: Structural complexity simplified by CO cooling

The voltammetry of surfaces vicinal to Pt{110}: Structural complexity simplified by CO cooling

Why conclusions from platinum model surfaces do not necessarily lead to enhanced nanoparticle catalysts for the oxygen reduction reaction

Loading effect of carbon-supported platinum nanocubes on oxygen electroreduction

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