Evidence for Independent Glycerol Electrooxidation Behavior on Different Ordered Domains of Polycrystalline Platinum

Fernández, Pablo S.; Martins, Cauê A.; Angelucci, Camilo A.; Gomes, Janaina F.; Câmara, Giuseppe A.; Martins, M.E.; Tremiliosi‐Filho, Germano

doi:10.1002/celc.201402291

Cited by 48 publications

(60 citation statements)

References 25 publications

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“…Analogously, the ethanol electrooxidation reaction on Pt electrodes also show high degree of electrode deactivation under high pH . In addition, when compared with results obtained in acidic solutions, the voltammetric profile of GEOR in alkaline medium is significantly different, showing higher electroactivity, independently of the surface orientation used …”

Section: Resultsmentioning

confidence: 76%

“…In an recent communication is showed that after the first cycle the Pt(111) electrode has a dramatic deactivation, lowering its electroactivity to about 10 % of the highest faradaic response . In acidic media, the GEOR on Pt electrodes follow a similar trend as observed in basic media, in a much less extent …”

Section: Resultsmentioning

confidence: 79%

“…[23] In acidic media, the GEOR on Pt electrodes follow a similar trend as observed in basic media, in a much less extent. [18][19][20]40] From the previous references, it is showed that at low pH values the GEOR proceeds through successive dehydrogenation steps to form single bonded CO as a reaction intermediate (CO ads ) at potentials as low as 0.2 V, regardless the surface orientation. [16][17][18]21] Although the carbon monoxide molecule coordinates strongly to Pt atoms and then could act as surface poison in acidic media, it is oxidized above 0.7 V so that the surface recovers its activity at those potentials.…”

Section: General Analysis Of Voltammetric Features Of the Glycerol Oxmentioning

confidence: 99%

“…The use of well‐ordered single crystal electrodes as model surfaces has provided an indispensable strategy when one wants to study specific reaction parameters in isolation. Despite the advantages of using single crystals to gather deeper insights about the kinetics and mechanism reaction, the impact of structure sensitivity of GEOR is a scarcely investigated issue …”

Section: Introductionmentioning

confidence: 99%

“…Despite the advantages of using single crystals to gather deeper insights about the kinetics and mechanism reaction, the impact of structure sensitivity of GEOR is a scarcely investigated issue. [17][18][19][20][21][22] In a recent study, Garcia et al [17] showed that, besides the structure-sensitive process, the GEOR in acidic media selectively oxidize glycerol to glyceraldehyde, glyceric acid, and dihydroxyacetone on Pt(111) while only glyceraldehyde was detected as the main product of the reaction on the Pt(100) electrode.…”

Section: Introductionmentioning

confidence: 99%

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Electrocatalytic Oxidation of Glycerol on Platinum Single Crystals in Alkaline Media

et al. 2019

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Glycerol adsorption and oxidation reactivity at platinum single crystal electrodes in alkaline media using electrochemical and Fourier transform infrared (FTIR) techniques are reported. The behavior of Pt(100) and Pt(110) for the glycerol electrooxidation reaction (GEOR) were compared and analyzed altogether with those previously reported for Pt(111) ( R. M. L. M. Sandrini, J. R. Sempionatto, E. Herrero, J. M. Feliu, J. Souza‐Garcia, C. A. Angelucci, Electrochem. commun. 2018, 86, 149–152). The voltammetric profiles confirm the structure sensitivity of GEOR as well as the role of the surface atoms orientation on the electrocatalytic activity. The Pt(100) surface has shown to be less prone to poisoning during multiple potential cycles in contrast to Pt(110), which suffers an accentuate deactivation at the first positive‐going scan. Spectroscopic results show that the GEOR on all three surfaces is characterized by the presence of two broad bands, centered at circa 1400 cm−1 and 1600 cm−1. This provides evidence that the GEOR mechanism undergoes glycerol dehydrogenation to alkoxydes followed by the formation of aldehyde intermediates adsorbed as η1(O)‐aldehyde and η1(C)‐acyl geometry, respectively. The surface atomic arrangement induces different selectivity in the oxidation process.

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Section: Resultsmentioning

confidence: 76%

Section: Resultsmentioning

confidence: 79%

Section: General Analysis Of Voltammetric Features Of the Glycerol Oxmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Electrocatalytic Oxidation of Glycerol on Platinum Single Crystals in Alkaline Media

et al. 2019

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Promotion of Glycerol Oxidation by Selective Ru Decoration of (100) Domains at Nanostructured Pt Electrodes

et al. 2019

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Glycerol (GlOH) electrooxidation is a potential route to GlOH valorisation. In this work, we show that GlOH oxidation can be enhanced at bimetallic PtÀ Ru electrodes with respect to bare Pt in sulphuric acid. We electrodeposited high-surface area Pt electrodes comprising of 40 % (100) sites, along with a smaller amount of (111) domains. Spontaneous Ru deposition was carried out by immersion in a RuCl 3 solution for a varying amount of time. Voltammetric methods demonstrated that (100) sites are decorated most readily. PtÀ Ru electrodes display an earlier onset potential for CO ads oxidation, which translates into an anticipation of the main GlOH oxidation wave. Under prolonged Ru deposition, Ru decoration also proceeds close to (111) Pt domains, as highlighted by CO stripping. We suggest that such ensembles may play a critical role in achieving optimal GlOH activity at PtÀ Ru.

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Clarifying Glycerol Electrooxidation Studies on Pd‐Based Catalysts: Insights Into Catalytic Performance and Practical Challenges

Zanata,

Alencar,

Santos

et al. 2024

ChemPlusChem

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Escalating biodiesel production led to a surplus of glycerol, prompting its exploration as a valuable resource in industrial applications. Electrochemical systems have been studied, specifically employing noble metal catalysts like palladium for glycerol electrooxidation. Despite numerous studies on Pd‐based catalysts for glycerol electrooxidation, a comprehensive analysis addressing critical questions related to the economic feasibility, global sourcing of Pd, and the thematic cohesion of publications in this field is lacking. Moreover, a standardized framework for comparing the results of various studies is absent, hindering progress on glycerol technologies. This critical overview navigates the evolution of Pd‐based catalysts for glycerol electrooxidation, examining catalytic activity, stability, and potential applications. It critically addresses the geographical sources of Pd, the motivation behind glycerol technology exploration, thematic coherence in existing publications, and the meaningful comparison of results. It correlates the use of Pd‐based catalysts with the natural source of Pd and the origin of glycerol derived from biodiesel. The proposed standardized approach for comparing electrochemical parameters and establishing experimental protocols provides a foundation for meaningful study comparisons. This critical overview underscores the need to address fundamental questions to accelerate the transition of glycerol technologies from laboratories to practical applications.

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Evidence for Independent Glycerol Electrooxidation Behavior on Different Ordered Domains of Polycrystalline Platinum

Cited by 48 publications

References 25 publications

Electrocatalytic Oxidation of Glycerol on Platinum Single Crystals in Alkaline Media

Electrocatalytic Oxidation of Glycerol on Platinum Single Crystals in Alkaline Media

Promotion of Glycerol Oxidation by Selective Ru Decoration of (100) Domains at Nanostructured Pt Electrodes

Clarifying Glycerol Electrooxidation Studies on Pd‐Based Catalysts: Insights Into Catalytic Performance and Practical Challenges

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