Electrochemical CO stripping on nanosized Pt surfaces in acid media: A review on the issue of peak multiplicity

Ciapina, Eduardo G.; Santos, Sydney Ferreira; González, Ernesto Rafael

doi:10.1016/j.jelechem.2018.02.047

Cited by 98 publications

(66 citation statements)

References 61 publications

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“…As there is no oxidation peak at 0.9 V vs. SHE for the Pt oxide, it can be assumed that the oxidation peak at 0.9 V vs. SHE can be attributed to adsorption species or products which are specific to the CO 2 electroreduction reaction on Pt. As CO oxidation peaks are observed during CO-stripping voltammetry at 0.8 to 0.9 V vs. SHE, [26][27][28][29][30] we can say that CO was produced during the CO 2 electroreduction on Pt. Figure 3 shows an Arrhenius plot of the CO 2 electroreduction reaction rate of the Pt and Pt oxide.…”

Section: ¹2mentioning

confidence: 91%

In-situ Analysis of CO<sub>2</sub> Electroreduction on Pt and Pt Oxide Cathodes

et al. 2020

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The issue of excessive amounts of CO 2 in the atmosphere has promoted the study of methods of removing it from the atmosphere. In the field of electrochemistry, electroreduction of CO 2 has become an area of significant scientific interest. Our previous work has shown Pt oxide exhibits a higher CO 2 electroreduction activity than Pt. In this study, the surface adsorption species on Pt and Pt oxide during electroreduction were investigated with SEIRAS to clarify the mechanisms of the superior electroreduction activity of Pt oxide. The main adsorption species during CO 2 electroreduction were methanol and HCOO − on the Pt oxide, and methanol and linear-CO on the Pt. We confirmed that the CO 2 electroreduction reaction proceeds via HCOO − on Pt oxide, and through CO on Pt. The CO 2 electroreduction activity is significantly affected by the adsorption species because CO strongly adsorbs on the active site and inhibits subsequent reactions. The residual oxygen in the reduced Pt oxide electrode may cause the difference in adsorption species, controlling the reaction pathway. We conclude that the superior CO 2 electroreduction activity of Pt oxide is due to the difference in the reaction pathway, possibly caused by residual oxygen and oxygen vacancies in the Pt oxide electrode.

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Section: ¹2mentioning

confidence: 91%

In-situ Analysis of CO<sub>2</sub> Electroreduction on Pt and Pt Oxide Cathodes

et al. 2020

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“…Moreover, the nature of such a characteristic peak of the Pt2NiCo/C (0.70 V/RHE) nanocatalyst differed from that of the Pt/C (0.8 V/RHE) nanocatalyst. This change in CO peak can be associated to the crystallographic planes, shape, size, composition, and agglomeration of the Pt2NiCo nanoparticles [37,38]. The calculated ECSAs of the Pt2NiCo/C and commercial Pt/C nanocatalysts are presented in Table 1, where it is observed that the Pt2NiCo/C nanocatalyst presented a lower ECSA relative to that for Pt/C.…”

Section: Catalytic Activity For the Orrmentioning

confidence: 96%

A Trimetallic Pt2NiCo/C Electrocatalyst with Enhanced Activity and Durability for Oxygen Reduction Reaction

et al. 2020

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Commercialization of the polymer electrolyte membrane fuel cell (PEMFC) requires that electrocatalysts for oxygen reduction reaction (ORR) satisfy two main considerations: materials must be highly active and show long-term stability in acid medium. Here, we describe the synthesis, physical characterization, and electrochemical evaluation of carbon-dispersed Pt2NiCo nanocatalysts for ORR in acid medium. We synthesized a trimetallic electrocatalyst via chemical route in organic medium and investigated the physical properties of the Pt2NiCo/C nanocatalyst by X-ray diffraction (XRD), energy-dispersive X-ray spectroscopy-scanning electron microscope (EDXS-SEM), and scanning transmission electron microscopy (STEM), whereas the catalytic activities of the Pt2NiCo/C and Pt/C nanocatalysts were determined through cyclic voltammetry (CV), CO-stripping, and rotating disk electrode (RDE) electrochemical techniques. XRD and EDXS-SEM results confirmed the presence of the three metals in the nanoparticles, and scanning transmission electron microscopy (STEM) allowed observation of the Pt2NiCo nanoparticles at ~10 nm. The measured specific activity for the synthesized nanocatalyst is ~6.4-fold higher than that of Pt/C alone, and its mass activity is ~2.2-fold higher than that of Pt/C, which is attributed to the synergistic interaction of the trimetallic electrocatalyst. Furthermore, the specific and mass activities of the synthesized material are maintained after the accelerated stability test, whereas the catalytic properties of Pt/C decreased. These results suggest that the Pt2NiCo/C trimetallic nanocatalyst is a promising candidate cathode electrode for use in PEMFCs.

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“…It is known that the reaction between CO ad and water (or oxygenated species), i.e., the electrooxidation of CO ad to CO 2 , includes an elementary step that proceeds by Langmuir-Hinshelwood (L-H) mechanism. [27][28][29][30][31][32] In other words, the adsorption of water (or oxygenated species) is involved in the CO ad oxidation. On the other hand, density functional studies show that ethanol binds on the on-top site of Pt surface through its oxygen atom.…”

Section: Is Co Ad Removed By Ethanol?mentioning

confidence: 99%

Electrooxidation of Ethanol on Pt in the Absence of Water

2020

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It is well accepted that the electrooxidation of ethanol on Pt in aqueous solution proceeds via two parallel pathways: C1-pathway, which is the complete oxidation of ethanol to CO 2 via CO ad intermediate, and C2-pathway, which produces acetaldehyde and also acetic acid with further oxidation. Water plays important roles for the oxidation, i.e., for the oxidative removal of CO ad in the C1-pathway and for the oxidation of acetaldehyde to acetic acid in the C2-pathway. In the present work, however, we show that the ethanol oxidation proceeds in the absence of water. Detailed study using surface-enhanced infrared absorption spectroscopy and high-performance liquid chromatography reveals that CO ad reacts with ethanol to form ethyl formate, which is designated as C3-pathway, and also that the ethanol oxidation produces ethyl acetate, which is designated as C4-pathway.

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Electrochemical CO stripping on nanosized Pt surfaces in acid media: A review on the issue of peak multiplicity

Cited by 98 publications

References 61 publications

In-situ Analysis of CO<sub>2</sub> Electroreduction on Pt and Pt Oxide Cathodes

In-situ Analysis of CO<sub>2</sub> Electroreduction on Pt and Pt Oxide Cathodes

A Trimetallic Pt2NiCo/C Electrocatalyst with Enhanced Activity and Durability for Oxygen Reduction Reaction

Electrooxidation of Ethanol on Pt in the Absence of Water

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