XPS study on the passivity of coarse-grained polycrystalline and electrodeposited nanocrystalline nickel-iron (NiFe) alloys

Monaco, L. Lo; Sodhi, Rana N.S.; Palumbo, G.; Erb, U.

doi:10.1016/j.corsci.2020.108902

Cited by 23 publications

(11 citation statements)

References 148 publications

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“…The output band of the O 1 s peak varies in the binding energy range of 529-532 eV depending on the composition of the catalyst and the calcination temperature. According to the information in the literature, it can be said that the O 1 s spectrum originates from O x 2− lattice oxygen (Flak et al 2018;Monaco et al 2020). It was determined that the intensity of some peaks decreased and they were not seen in the spectrum depending on the change in the mass ratios of the components and the change in the calcination temperature.…”

Section: Characterization Resultsmentioning

confidence: 99%

Development of NiFeSi mixed oxide catalysts for CO methanation

2021

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NiFeSi mixed oxide catalysts were prepared using the surfactant-assisted co-precipitation method to remove the CO which may be present in the fuel before entering the fuel cell, and the catalysts were calcined at two different temperatures in order to determine the effect of the calcination temperature on the characteristic properties. Catalysts were prepared in four different NiO, Fe 2 O 3 and SiO 2 weight ratios. The X-ray diffraction (XRD), X-ray photoelectron spectroscopy (XPS), N 2 physisorption, high-resolution transmission electron microscopy (HRTEM), scanning electron microscopy (SEM) and energy-dispersive X-ray (EDS) analysis were used to characterize the catalysts. CO methanation was done using 1% CO, 50% H 2 and the remainder He feed condition. The reaction temperature varied between the 125 °C and 375 °C. X-ray diffraction analysis showed that catalysts composed of NiO, Fe 2 O 3 and SiO 2 crystal phases. Catalysts calcined at 500 °C gave highest surface areas and their structures are composed of spherical particles on the surface. Low surface areas were obtained in catalysts calcined at 700 °C due to structural deterioration, such as small pores breaking down and combining to form large pores. Due to the increase in calcination temperature from 500 °C to 700 °C, the rod-like particles were formed from spherical particles. Activity studies were done over the catalysts calcined at 500 °C since they have highest surface area values. Between the catalysts, 0.8/0.2/1 NiFeSi mixed oxide catalyst gave the highest activity which gave 50% CO conversion at 188 °C and 100% CO conversion at T > 275 °C.

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Section: Characterization Resultsmentioning

confidence: 99%

Development of NiFeSi mixed oxide catalysts for CO methanation

2021

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“…S1†), indicating the successful growth of the NiFe-LDH electroactive material on the surface. The possible reaction equations are as follows: 42 Forming products in air: NiFe 2 O 4 + H 2 O + CO 2 → NiFe-LDH…”

Section: Methodsmentioning

confidence: 99%

Oxygen vacancies meet partial S substitution: an effective strategy to achieve obvious synergistic effects and adjustable electrochemical behavior in NiFe-LDH for enhanced OER and capacitive performance

Dong

et al. 2023

Inorg. Chem. Front.

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“…The corrosion layer contained Fe, Mn, Cr, O, Ag, C, Cl, Si, and other elements. Among them, Fe, Mn, Cr, Ag, C, and Si were from the alloy matrix, and O and Cl were mainly from the corrosive medium [27][28][29]. The XPS energy spectrum of the Fe2p3/2 alloy had four peaks; the characteristic peaks corresponded to Fe, Fe 3 O 4 , FeCl 2 , and FeCl 3 .…”

Section: Corrosion Resistancementioning

confidence: 99%

Effects of Cu and Ag Elements on Corrosion Resistance of Dual-Phase Fe-Based Medium-Entropy Alloys

Zhao

et al. 2023

Materials

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The effect of adding elements to promote phase separation on the functional properties of medium-entropy alloys has rarely been reported. In this paper, medium-entropy alloys with dual FCC phases were prepared by adding Cu and Ag elements, which exhibited a positive mixing enthalpy with Fe. Dual-phase Fe-based medium-entropy alloys were fabricated via water-cooled copper crucible magnetic levitation melting and copper mold suction casting. The effects of Cu and Ag elements microalloying on the microstructure and corrosion resistance of a medium-entropy alloy were studied, and an optimal composition was defined. The results show that Cu and Ag elements were enriched between the dendrites and precipitated an FCC2 phase on the FCC1 matrix. During electrochemical corrosion under PBS solutions, Cu and Ag elements formed an oxide layer on the alloy’s surface, which prevented the matrix atoms from diffusing. With an increase in Cu and Ag content, the corrosion potential and the arc radius of capacitive resistance increased, while the corrosion current density decreased, indicating that corrosion resistance improved. The corrosion current density of (Fe63.3Mn14Si9.1Cr9.8C3.8)94Cu3Ag3 in PBS solution was as high as 1.357 × 10−8 A·cm−2.

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XPS study on the passivity of coarse-grained polycrystalline and electrodeposited nanocrystalline nickel-iron (NiFe) alloys

Cited by 23 publications

References 148 publications

Development of NiFeSi mixed oxide catalysts for CO methanation

Development of NiFeSi mixed oxide catalysts for CO methanation

Oxygen vacancies meet partial S substitution: an effective strategy to achieve obvious synergistic effects and adjustable electrochemical behavior in NiFe-LDH for enhanced OER and capacitive performance

Effects of Cu and Ag Elements on Corrosion Resistance of Dual-Phase Fe-Based Medium-Entropy Alloys

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