Improved electrochemical property of copper nitrate hydrate by multi-wall carbon nanotube

Zheng, Xi; Wu, Kaiqiang; Mao, Jinli; Jiang, Xinxin; Shao, Lianyi; Lin, Xiaoting; Li, Peng; Shui, Miao; Shu, Jie

doi:10.1016/j.electacta.2014.10.008

Cited by 6 publications

(4 citation statements)

References 24 publications

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“…According to Figure 6 a,b, 31 the intensity and position of all the peaks appearing at 11°, 24°, 33°, 35°, 37°, 48°, 52°, 60°, and 68° correspond to the standard pattern of zinc/chromium layered double hydroxides. As evident in Figure 6 c, the peaks appearing at 14.95°, 21.12°, 29.25°, 31.78°, 33.31°, 36.26°, 39°, 41°, 43.41°, 49°, 51.25°, 53.35°, and 57.98°, in accordance with the standard pattern of copper nitrate, 33 confirm that copper nitrate metal is successfully placed on the catalyst, showing the final structure of the catalyst with high crystallinity. The particle size was found to be approximately 10 nm using Scherrer’s equation.…”

Section: Resultssupporting

confidence: 82%

Copper Immobilized on Modified LDHs as a Novel Efficient Catalytic System for Three-Component Synthesis of Pyrano[2,3-d]pyrimidine and pyrazolo[4′,3′:5,6]pyrano[2,3-d]pyrimidine Derivatives

Momeni,

Ghorbani-Vaghei

2024

ACS Omega

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A novel catalyst based on layered double hydroxides coated with copper nitrate [LDH@(3-chloropropyl)trimethoxysilane@N1,N4-bis(4,6-diamino-1,3,5-triazin-2-yl)benzene-1,4-disulfonamide@Cu] was successfully synthesized. The structure of the new synthesized catalyst was investigated and confirmed using different analytical techniques, such as Fourier-transform infrared spectroscopy (FTIR), energy-scattered X-ray spectroscopy (EDX) mapping, X-ray diffraction (XRD), field-emission scanning electron microscopy (FESEM), and heat gravity/heat derivatization (TGA/DSC). The skilled catalyst proved its efficiency for one-pot three-component synthesis of pyrano [2,3-d]pyrimidine and new dihydropyrazolo[4′,3′:5,6]pyrano[2,3-d]pyrimidine-dione derivatives. Using this efficient catalyst, products were synthesized with a high yield, in a short time, and under soft and solvent-free conditions. The catalyst can be recovered and reused four times without a significant loss of efficiency.

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Section: Resultssupporting

confidence: 82%

Copper Immobilized on Modified LDHs as a Novel Efficient Catalytic System for Three-Component Synthesis of Pyrano[2,3-d]pyrimidine and pyrazolo[4′,3′:5,6]pyrano[2,3-d]pyrimidine Derivatives

Momeni,

Ghorbani-Vaghei

2024

ACS Omega

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“…After treatment with NH 4 OH and CTAB, the zeolite structure remained unchanged [28] . In addition, peaks 6.2, 10.16, 11.94, and 15.7 are shifted to 6.46, 10.44, 12.14, and 15.94, respectively, which can be related to the encaging of Mo and cu in the defect site of the zeolite which formed during preparation hierarchical zeolite process [29] . These results were approved with other characterization techniques (BET, DRS).…”

Section: Resultssupporting

confidence: 72%

“…[28] In addition, peaks 6.2, 10.16, 11.94, and 15.7 are shifted to 6.46, 10.44, 12.14, and 15.94, respectively, which can be related to the encaging of Mo and cu in the defect site of the zeolite which formed during preparation hierarchical zeolite process. [29] These results were approved with other characterization techniques (BET, DRS). Moreover, the catalyst's XRD pattern showed new peaks in the region of (2θ = 23, 27, 34), which are related to the formation of CuO in alkaline media, followed by calcination.…”

Section: Catalyst Characterizationsupporting

confidence: 68%

Improvement of the Oxidative Desulfurization Performance Using MoO₃/CuO‐Modified Hierarchical HY Zeolite

Moosavifar,

Poormahdigaemmagami

2024

ChemistrySelect

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The presence of sulfur compounds in the chemical industry poses significant environmental and economic problems, including endangering human and animal lives and damaging equipment. For this purpose, hierarchical HY zeolite (Hie‐Y) with a SiO2/Al2O3 molar ratio 10 was successfully synthesized through sequential desilication‐dealumination using NH4OH treatment. A weak alkaline media with surfactant cetyltrimethylammonium bromide (CTAB) facilitates mesoporosity formation and preserves the zeolite structure. Metal oxide (CuO, MoO3) ‐ hierarchical HY zeolite nanocomposites have been prepared by one or a combination of 3 methods: 1) ion exchange, 2) precipitation, and 3) calcination. The obtained catalysts were characterized using XRD, FT‐IR, FESEM, UV‐Vis, EDS, and BET techniques. The formation of a hierarchical structure is associated with structure preservation, but partial destruction occurs based on the entering Cu in the zeolite pores. These catalysts have been studied in the oxidative desulfurization (ODS) reaction. Several parameters, including temperature, catalyst amount, DBT concentration, and reaction time, were evaluated in ODS using the Taguchi Design of Experiments. Catalytic activity order was obtained as Y<Hie‐Y<Hie‐Y/CuO<Hie‐Y/MoO3<Hie‐Y/MoO3/CuO. Results indicate an activity increase for the Hie‐Y/MoO3/CuO hierarchical structure owing to synergistic effects of secondary mesoporosity and metal oxides. The catalyst was recoverable and reused for five consecutive runs with preservation of catalytic activity.

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“…The PXRD pattern of the Cu x @PAP was also indicative of the Cu II incorporation into polymer (Figure S13). The Cu 2p XPS spectrum of Cu 30 @PAP is typical of Cu II compounds (Figure j). The inductively coupled plasma mass spectrometry (ICP-MS) study of Cu 30 @PAP demonstrated that the weight percentage of Cu in PAP was estimated to be 3.29 wt % with respect to polymer (Table S1), which indicated an atomically dilute copper sample.…”

Section: Resultsmentioning

confidence: 99%

Elucidating the Role of Atomically Dilute Copper Centers Impregnating a Phosphamide Polymer for the Preferential Hydrogen Evolution Reaction over CO₂ Reduction

Chaudhary,

Adak,

Dhananjay

et al. 2023

Inorg. Chem.

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Organic polymers have attracted considerable interest in designing a multifunctional electrocatalyst. However, the inferior electro-conductivity of such metal-free polymers is often regarded as a shortcoming. Herein, a nitrogen-and phosphorus-rich polymer with phosphamide functionality (PAP) in the repeating unit has been synthesized from diaminopyridine (DAP) and phenylphosphonic dichloride (PPDC) precursors. The presence of phosphamide oxygen and pyridine nitrogen in the repeating unit of PAP leads to the coordination of the Cu II ion and the incorporation of 3.29 wt % in the polymer matrix (Cu 30 @PAP) when copper salt is used to impregnate the polymer. Combined with a spectroscopic, microscopic, and DFT study, the coordination and geometry of copper in the PAP matrix has been established to be a distorted square planar Cu II in a N 2 O 2 ligand environment where phosphamide oxygen and pyridine nitrogen of the PAP coordinate to the metal center. The copper incorporation in the PAP modulates its electrocatalytic activity. On the glassy carbon electrode, PAP shows inferior activity toward the hydrogen evolution reaction (HER) in 0.5 M H 2 SO 4 while 3 wt % copper incorporation (Cu 30 @PAP) significantly improves the HER performance with an overpotential of 114 mV at 10 mA cm −2 . The notable electrochemical activity with Cu 30 @PAP occurs due to the impregnation of Cu(II) in PAP, improved electro-kinetics, and better charge transfer resistance (R ct ). When changing the electrolyte from H 2 SO 4 to CO 2 -saturated bicarbonate solution at nearly neutral pH, PAP shows HER as the dominant pathway along with the partial reduction of CO 2 to formate. Moreover, the use of Cu 30 @PAP as an electrolcatalyst could not alter the predominant HER path, and only 20% Faradaic efficiency for the CO 2 reduced products has been achieved. Post-chronoamperometric characterization of the recovered catalyst suggests an unaltered valence state of the copper ion and the intact chemical structure of PAP. DFT studies unraveled that the copper sites of Cu 30 @PAP promote water adsorption while phosphamide−NH of the PAP can weakly hold the CO 2 adduct via a hydrogen bonding interaction. A detailed calculation has pointed out that the tetra-coordinated copper centers present in the PAP frame are the reactive sites and that the formation of the [Cu I −H] intermediate is the ratelimiting step for both HER and its competitive side reaction, i.e., CO 2 reduction to formate or CO formation. The high proton concentration in the electrolyte of pH < 7 leads to HER as the predominant pathway. This combined experimental and theoretical study has highlighted the crucial role of copper sites in electrocatalysis, emphasizing the plausible reason for electrocatalytic selectivity.

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Improved electrochemical property of copper nitrate hydrate by multi-wall carbon nanotube

Cited by 6 publications

References 24 publications

Copper Immobilized on Modified LDHs as a Novel Efficient Catalytic System for Three-Component Synthesis of Pyrano[2,3-d]pyrimidine and pyrazolo[4′,3′:5,6]pyrano[2,3-d]pyrimidine Derivatives

Copper Immobilized on Modified LDHs as a Novel Efficient Catalytic System for Three-Component Synthesis of Pyrano[2,3-d]pyrimidine and pyrazolo[4′,3′:5,6]pyrano[2,3-d]pyrimidine Derivatives

Improvement of the Oxidative Desulfurization Performance Using MoO₃/CuO‐Modified Hierarchical HY Zeolite

Elucidating the Role of Atomically Dilute Copper Centers Impregnating a Phosphamide Polymer for the Preferential Hydrogen Evolution Reaction over CO₂ Reduction

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Improved electrochemical property of copper nitrate hydrate by multi-wall carbon nanotube

Cited by 6 publications

References 24 publications

Copper Immobilized on Modified LDHs as a Novel Efficient Catalytic System for Three-Component Synthesis of Pyrano[2,3-d]pyrimidine and pyrazolo[4′,3′:5,6]pyrano[2,3-d]pyrimidine Derivatives

Copper Immobilized on Modified LDHs as a Novel Efficient Catalytic System for Three-Component Synthesis of Pyrano[2,3-d]pyrimidine and pyrazolo[4′,3′:5,6]pyrano[2,3-d]pyrimidine Derivatives

Improvement of the Oxidative Desulfurization Performance Using MoO3/CuO‐Modified Hierarchical HY Zeolite

Elucidating the Role of Atomically Dilute Copper Centers Impregnating a Phosphamide Polymer for the Preferential Hydrogen Evolution Reaction over CO2 Reduction

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Product

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Improvement of the Oxidative Desulfurization Performance Using MoO₃/CuO‐Modified Hierarchical HY Zeolite

Elucidating the Role of Atomically Dilute Copper Centers Impregnating a Phosphamide Polymer for the Preferential Hydrogen Evolution Reaction over CO₂ Reduction