Ambient pressure CO2 hydrogenation over a cobalt/manganese-oxide nanostructured interface: A combined in situ and ex situ study

Varga, Gábor; Sápi, András; Varga, Tamás; Baán, Kornélia; Szenti, Imre; Halasi, Gyula; Mucsi, Róbert; Óvári, László; Kiss, János; Fogarassy, Zsolt; Pécz, B.; Kukovecz, Ákos

doi:10.1016/j.jcat.2020.03.028

Cited by 46 publications

(25 citation statements)

References 69 publications

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“…In Figure 2 b, three sharp peaks at 658, 460, and 185 cm −1 were detected in the Raman spectrum of Co 3 O 4 /SiC NTA film; those peaks correspond to 1 A 1g , 1 E g and 3 F 2g Raman active modes of Co 3 O 4 [ 12 , 25 , 26 ]. As indicated in the previous report published by G. Varga et al [ 27 ], both the Raman ( Figure 2 b) and X-ray diffraction (XRD, Figure S1 in the Supporting Information ) measurements imply that a mixed spinel oxide structure could be produced via our synthesis route.…”

Section: Resultssupporting

confidence: 76%

Cobalt Oxide-Decorated Silicon Carbide Nano-Tree Array Electrode for Micro-Supercapacitor Application

et al. 2021

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A cobalt oxide (Co3O4)-decorated silicon carbide (SiC) nano-tree array (denoted as Co3O4/SiC NTA) electrode is synthesized, and it is investigated for the use in the micro-supercapacitor. Firstly, the well-standing SiC nanowires (NWs) are prepared by nickel (Ni)-catalyzed chemical vapor deposition (CVD) method, and then the thin layer of Co3O4 and the hierarchical Co3O4 nano-flower-clusters are, respectively fabricated on the side-walls and the top side of the SiC NWs via electrodeposition. The deposition of Co3O4 on the SiC NWs benefits for the charge transfer at the electrode/aqueous electrolyte interface due to its extremely hydrophilic surface characteristic after Co3O4 decoration. Furthermore, the Co3O4/SiC NTA electrode would possess a directional charge transport route along the nanowire length of SiC NWs owing to their well-standing architecture. By using the Co3O4/SiC NTA electrode for micro-supercapacitor, the areal capacitance obtained from cyclic voltammetry measurement reaches 845 mF cm−2 at a 10 mV s−1 scan rate. Finally, the capacitance durability is also evaluated by the cycling test of cyclic voltammetry at a high scan rate of 150 mV s−1 for 2000 cycles.

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Section: Resultssupporting

confidence: 76%

Cobalt Oxide-Decorated Silicon Carbide Nano-Tree Array Electrode for Micro-Supercapacitor Application

et al. 2021

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“…From a catalytic point of view, FA is a very useful precursor molecule in producing formate surface intermediates formed in several catalytic reactions. Formate could be an important intermediate in CO 2 methanation [31][32][33][34]64]. Formate may also be hydrogenated to methoxy species, which produces methanol [16][17][18][19][20].…”

Section: Discussion Of Surface Reaction Mechanismmentioning

confidence: 99%

“…Formic acid, HCOOH, is a very useful precursor molecule in producing formate surface intermediate because it can be dehydrogenated on metal and oxide surfaces. The knowledge of the surface chemistry of adsorbed formate as a reaction intermediate is of great assistance in the elaboration of the mechanism of several important catalytic reactions which contain C 1 species [13] such as water -gas shift reaction [14,15], methanol synthesis [16][17][18][19][20] and methanation of CO [21,22] and CO 2 [23][24][25][26][27][28][29][30][31][32][33][34]. The formate species can be detected on supported metal catalysts during these reactions mainly with IR vibrational techniques.…”

Section: Introductionmentioning

confidence: 99%

The Potassium-Induced Decomposition Pathway of HCOOH on Rh(111)

Kovács

Kiss

2020

Catalysts

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Formic acid (FA) can be considered both a CO and a H2 carrier via selective dehydration and dehydrogenation pathways, respectively. The two processes can be influenced by the modification of the active components of the catalysts used. In the present study the adsorption of FA and the decomposition of the formed formate intermediate were investigated on potassium promoted Rh(111) surfaces. The preadsorbed potassium markedly increased the uptake of FA at 300 K, and influenced the decomposition of formate depending on the potassium coverage. The work function (Δϕ) is increased by the adsorption of FA on K/Rh(111) at 300 K suggesting a large negative charge on the chemisorbed molecule, which could be probably due to the enhanced back-donation of electrons from the K-promoted Rh into an empty π orbital of HCOOH. The binding energy of the formate species is therefore increased resulting in a greater concentration of irreversibly adsorbed formate species. Decomposition of the formate species led to the formation of H2, CO2, H2O, and CO, which desorbed at significantly higher temperatures from the K-promoted surface than from the K-free one as it was proven by thermal desorption studies. Transformation of surface formate to carbonate (evidenced by UPS) and its decomposition and desorption is responsible for the high temperature CO and CO2 formation.

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“…77 We also found in our recent studies that Mn(II) helped the reduction of CO 2 hydrogenation as a support for metallic Cobalt where the reaction followed the format pathway towards CH 4 production. 78 We believe that, the presence of Mn(II) as well as the ratio of Mn(III)/Mn(IV) is crucial for this reaction driven by manganese oxide-based catalysts.…”

Section: Determining the Oxidation States (Xps Data Processing And Evmentioning

confidence: 96%

One-pot mechanochemical ball milling synthesis of the MnO_x nanostructures as efficient catalysts for CO₂ hydrogenation reactions

Ochirkhuyag

Sápi

Szamosvölgyi

et al. 2020

Phys. Chem. Chem. Phys.

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Ambient pressure CO2 hydrogenation over a cobalt/manganese-oxide nanostructured interface: A combined in situ and ex situ study

Cited by 46 publications

References 69 publications

Cobalt Oxide-Decorated Silicon Carbide Nano-Tree Array Electrode for Micro-Supercapacitor Application

Cobalt Oxide-Decorated Silicon Carbide Nano-Tree Array Electrode for Micro-Supercapacitor Application

The Potassium-Induced Decomposition Pathway of HCOOH on Rh(111)

One-pot mechanochemical ball milling synthesis of the MnO_x nanostructures as efficient catalysts for CO₂ hydrogenation reactions

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Ambient pressure CO2 hydrogenation over a cobalt/manganese-oxide nanostructured interface: A combined in situ and ex situ study

Cited by 46 publications

References 69 publications

Cobalt Oxide-Decorated Silicon Carbide Nano-Tree Array Electrode for Micro-Supercapacitor Application

Cobalt Oxide-Decorated Silicon Carbide Nano-Tree Array Electrode for Micro-Supercapacitor Application

The Potassium-Induced Decomposition Pathway of HCOOH on Rh(111)

One-pot mechanochemical ball milling synthesis of the MnOx nanostructures as efficient catalysts for CO2 hydrogenation reactions

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One-pot mechanochemical ball milling synthesis of the MnO_x nanostructures as efficient catalysts for CO₂ hydrogenation reactions