Mechanistic study of methanol oxidation on Pt(1 1 1) single crystal

Selivanova, Aleksandra V.; Demina, Victoria G.; Aydakov, Egor E.; Saraev, Аndrey А.; Kaichev, Vasily V.; Bukhtiyarov, Valerii I.

doi:10.1016/j.apsusc.2021.152140

Cited by 16 publications

(13 citation statements)

References 44 publications

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Section: Methodsmentioning

confidence: 99%

“…5 also shows the RA spectrum of the same sample obtained using the visible-and UV-range RAS setup implemented according to the conventional method based on a diffraction-grating spectrometer. 19 The dashed line in Fig. 5 shows the spectrum obtained using a standard Mertz phase correction technique in which the entire signal is considered positive.…”

Section: Features Of Phase Correctionmentioning

confidence: 99%

“…As a result, PM-IRRAS considers the difference between the reflected beams with polarization in the plane of the sample surface and in the plane perpendicular to the surface. In addition, in the studies by the PM-IRRAS method, as a rule, rather narrow spectral lines are recorded, 19 which correspond to absorption lines of the organic compound, in contrast to the typically broad RAS spectra lineshapes of semiconductor materials. 1 In the only available studies on the anisotropy of FT-IR normal incidence reflection spectra, performed using a synchrotron radiation source, the shape of the obtained spectra was apparently distorted owing to the spectrally inhomogeneous effectiveness of polarization modulation, 20 which can be just partially compensated using a mathematical model.…”

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Fourier Transform Infrared Reflection Anisotropy Spectroscopy of Semiconductor Crystals and Structures: Development and Application in the Mid-Infrared

Firsov

Комков

2023

Appl Spectrosc

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A new method of reflection anisotropy spectroscopy (RAS) with increased mid-IR efficiency owing to the use of a Fourier-transform infrared (FT-IR) spectrometer has been developed. An optical setup was implemented using a photoelastic modulator (PEM) to modulate the direction of linear polarization of the probe beam originating from the Michelson interferometer. An original measurement algorithm was proposed to eliminate the influence of spectral inhomogeneity of the PEM efficiency on the obtained spectra via appropriate calibration. It was shown that to preserve the sign of the RAS signal, it is necessary to use a specialized procedure for phase correction of the interferogram registered by the FT-IR spectrometer. In the visible range, good agreement was confirmed between the obtained reflection anisotropy (RA) spectra of a semiconductor crystal and the results of independent measurements using a conventional diffraction grating spectrometer-based setup. The RA spectrum of a III-V semiconductor heterostructure in the mid-infrared range (λ up to 8 µm) is demonstrated. Application of the developed FT-IR RAS method to layered black phosphorus has enabled characterization of anisotropic interband transitions in a graphene-like semiconductor crystal.

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Section: Methodsmentioning

confidence: 99%

Section: Features Of Phase Correctionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Fourier Transform Infrared Reflection Anisotropy Spectroscopy of Semiconductor Crystals and Structures: Development and Application in the Mid-Infrared

Firsov

Комков

2023

Appl Spectrosc

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“…It is generally considered that indirect pathway is the preferential mechanistic route for MOR in acidic media. [43,[50][51][52][53] In the case of Pt CF 3 NPs, a different mechanistic pathway is necessarily applied and the direct pathway is the only mechanism possible which could conciliate lower amount of the adsorbed CO and higher activity. Moreover, the direct pathway agrees well the observations above regarding the shape of Pt CF 3 NPs voltammetry in Figure 7a.…”

Section: Mor Electrocatalytic Activity Of Pt Cf 3 Nps/cmentioning

confidence: 99%

Chemical Surface Grafting of Pt Nanocatalysts for Reconciling Methanol Tolerance with Methanol Oxidation Activity

Lenne

Mattiuzzi²,

Jabin

et al. 2023

ChemSusChem

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A conceptual challenge toward more versatile direct methanol fuel cells (DMFCs) is the design of a single material electrocatalyst with high activity and durability for both oxygen reduction reaction (ORR) and methanol oxidation reaction (MOR). This requires to conciliate methanol tolerance not to hinder ORR at the cathode with a good MOR activity at the anode. This is especially incompatible with Pt materials. We tackled this challenge by deriving a supramolecular concept where surface-grafted molecular ligands regulate the Pt-catalyst reactivity. ORR and MOR activities of newly reported Ptcalix[4]arenes nanocatalysts (Pt CF 3 NPs/C) are compared to commercial benchmark PtNPs/C. Pt CF 3 NPs/C exhibit a remarkable methanol tolerance without losing the MOR reactivity along with outstanding durability and chemical stability. Beyond designing single-catalyst material, operable in DMFC cathodic and anodic compartments, the results highlight a promising strategy for tuning interfacial properties.

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Co Ion‐, NiS2‐ and CNT‐Co‐Doped Nanoflower/Hollow Spherical NiO Nanocomposites for Efficient Electrocatalytic Oxidation of Methanol

Yu,

Zhang,

Long

et al. 2023

ChemistrySelect

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Nowadays, the development and utilization of clean energy are becoming increasingly urgent. Among them, methanol is a new, clean, and efficient energy source. Therefore, more and more studies are focusing on methanol anodic oxidation (MOR). In this work, nanoflower and hollow spherical NiO was synthesized by a simply hydrothermal method and then modified by Co ion, NiS2 and carbon nanotubes (CNTs). The optimal Co/NiO(f)/NiS2−CNT exhibits flower‐like morphology with a larger specific surface area, enlarged electrochemically active surface area and higher conductivity, which improve the electron transfer ability and electrocatalytic activity compared with pure NiO(f), NiO(f)/NiS2, NiO(f)/NiS2−CNT and hollow spherical Co/NiO(hs)/NiS2−CNT. The current density is ultrahigh of 203.46 mA ⋅ cm−2 at 0.8 V, which is 36 times higher than pure NiO(f) and almost 2 times higher than Co/NiO(hs)/NiS2−CNT. Therefore, this work offers a highly efficient and stable NiO based catalyst for methanol oxidation reaction.

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Mechanistic study of methanol oxidation on Pt(1 1 1) single crystal

Cited by 16 publications

References 44 publications

Fourier Transform Infrared Reflection Anisotropy Spectroscopy of Semiconductor Crystals and Structures: Development and Application in the Mid-Infrared

Fourier Transform Infrared Reflection Anisotropy Spectroscopy of Semiconductor Crystals and Structures: Development and Application in the Mid-Infrared

Chemical Surface Grafting of Pt Nanocatalysts for Reconciling Methanol Tolerance with Methanol Oxidation Activity

Co Ion‐, NiS2‐ and CNT‐Co‐Doped Nanoflower/Hollow Spherical NiO Nanocomposites for Efficient Electrocatalytic Oxidation of Methanol

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