Design of Self-Supported Flexible Nanostars MFe-LDH@ Carbon Xerogel-Modified Electrode for Methanol Oxidation

Abdelrazek, Ghada M.; El-Deeb, M. M.; Farghali, Ahmed A.; Pérez-Cadenas, Agustı́n F.; Abdelwahab, Abdalla

doi:10.3390/ma14185271

Cited by 12 publications

(6 citation statements)

References 68 publications

(85 reference statements)

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“…Hybridizing LDHs with conductive agents can enhance charge transfer, thus improving electrocatalytic efficiency . Numerous studies have been reported combining LDH with conductive materials such as carbon xerogel (CX), reduced graphene oxides (rGOs), metal oxides, etc., for electrochemical methanol oxidation. − Luo et al engineered P-doped CoNi LDH with rGO and observed an improvement in the methanol oxidation 1.7-fold more remarkable than that of P-doped CoNi LDH . Meanwhile, the lack of long-term stability of P-doped CoNi LDH/rGO hindered its commercialization.…”

Section: Introductionmentioning

confidence: 99%

“…20 Numerous studies have been reported combining LDH with conductive materials such as carbon xerogel (CX), reduced graphene oxides (rGOs), metal oxides, etc., for electrochemical methanol oxidation. 21−23 21 The carbon-derived xerogel boosted electrocatalytic activity by reducing LDH aggregation. The results demonstrated NiFe-LDH/CX/NF as the best catalyst with an enhanced current density of 400 mA cm −2 and excellent stability.…”

Section: ■ Introductionmentioning

confidence: 99%

“…Meanwhile, the lack of long-term stability of P-doped CoNi LDH/rGO hindered its commercialization. Abdelrazek et al studied MFe-LDH (M = Ni, Co, Zn) coupled with carbon xerogel (CX) supported on nickel foam (NF) for catalyzing methanol oxidation . The carbon-derived xerogel boosted electrocatalytic activity by reducing LDH aggregation.…”

Section: Introductionmentioning

confidence: 99%

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Flower-like Layered NiCu-LDH/MXene Nanocomposites as an Anodic Material for Electrocatalytic Oxidation of Methanol

et al. 2023

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Direct methanol fuel cell (DMFC) technology has grabbed much attention from researchers worldwide in the realm of green and renewable energy-generating technologies. Practical applications of DMFCs are marked by the development of highly active, efficient, economical, and long-lasting anode catalysts. Layered double hydroxide (LDH) nanohybrids are found to be efficient electrode materials for methanol oxidation. In this study, we synthesized NiCu-LDH/MXene nanocomposites (NCMs) and investigated their electrochemical performance for methanol oxidation. The formation of NCM was verified through field emission scanning electron microscopy (FE-SEM), energy-dispersive X-ray spectroscopy (EDX), X-ray diffraction (XRD), Fourier transform infrared (FTIR) spectroscopy, Brunauer–Emmett–Teller (BET), and X-ray photoemission spectroscopy (XPS) analyses. The cyclic voltammetry, chronoamperometry, and electron impedance spectroscopy techniques were carried out to assess the electrocatalytic ability of the methanol oxidation reaction. The incorporation of MXene enhanced the methanol oxidation 2-fold times higher than NiCu-LDH. NCM-45 exhibited high peak current density (86.9 mA cm–2), enhanced electrochemical active surface area (7.625 cm2), and long-term stability (77.8% retention after 500 cycles). The superior performance of NCM can be attributed to the synergistic effect between Ni and Cu and, further, the electronic coupling between LDH and MXene. Based on the results, NCM nanocomposite is an efficient anodic material for the electrocatalytic oxidation of methanol. This study will open the door for the development of various LDH/MXene nanocomposite electrode materials for the application of direct methanol fuel cells.

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Section: Introductionmentioning

confidence: 99%

Section: ■ Introductionmentioning

confidence: 99%

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Flower-like Layered NiCu-LDH/MXene Nanocomposites as an Anodic Material for Electrocatalytic Oxidation of Methanol

et al. 2023

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“…These modes include the stretching of OH – groups engaged in hydrogen bonding with interlayer water molecules, bending modes of OH groups in water molecules, vibrations of interlayer CO 3 2– and NO 3 – anions, and the presence of methanol molecules (Figure S6). ,− Notably, the FT-IR spectra of NC and NF closely resemble those of NCR and NFR, indicating the structural stability of LDH during the Ru doping process. Upon subjecting the NCR and NFR materials to a 24-h BDC reaction process, characteristic peaks associated with LDH disappeared, which are replaced by new peaks as shown in Figure d.…”

Section: Resultsmentioning

confidence: 81%

In Situ Reconstructed Layered Double Hydroxides via MOF Engineering and Ru Doping for Decoupled Acidic Water Oxidation Enhancement

Vijayakumar,

Lenus,

Pradeeswari

et al. 2024

Energy Fuels

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Discovering cost-effective, durable, and economical electrocatalysts for the lattice oxygen-mediated mechanism (LOM)based oxygen evolution reaction (OER) under acidic conditions is essential for advancing the commercialization of electrochemical water-splitting devices. In this study, we effectively constructed a distinctive petal-like nanoflake (NFls) structure by introducing ruthenium (Ru) into a NiM (M = Fe, Co) metal−organic framework (MOF) on a nickel foam (NFo) substrate through a straightforward in situ conversion process of layered double hydroxides (LDHs). Utilizing the unique electrochemical properties of this material, the Ru-doped NiFe-BDC/NFo exhibited an impressively low overpotential of ∼247 mV at a current density of 10 mA cm −2 when operating in an acidic environment for OER. Most notably, our champion catalysts displayed exceptional long-term stability during continuous operation for 20 h in 0.5 M H 2 SO 4 , positioning them as some of the top electrocatalysts for acidic conditions. The exceptional catalytic performance of NiM (M = Fe, Co)-BDC/NFo can be ascribed to the introduction of Ru and the conversion of LDH into a MOF. This transformation significantly enhances reaction kinetics and facilitates charge transfer, ultimately resulting in the attainment of optimal activity for the OER. This research introduces a novel category of electrocatalysts for the OER under acidic conditions, which has been relatively underexplored.

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“…Two strong peaks for the D-band and G-band of carbon are observed at about 1346 cm −1 and 1599 cm −1 , respectively. The D-band occurred due to the alternating benzene ring vibrations, while the G-band developed due to the sp 2 structure [ 27 ]. A reduction in the D- and G-bands was shown for the NiMo2/AC sample, suggesting a more disordered structure, which is in agreement with the surface area data.…”

Section: Resultsmentioning

confidence: 99%

2D Hierarchical NiMoO4 Nanosheets/Activated Carbon Nanocomposites for High Performance Supercapacitors: The Effect of Nickel to Molybdenum Ratios

et al. 2023

Self Cite

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Supercapacitors have the potential to be used in a variety of fields, including electric vehicles, and a lot of research is focused on unique electrode materials to enhance capacitance and stability. Herein, we prepared nickel molybdate/activated carbon (AC) nanocomposites using a facile impregnation method that preserved the carbon surface area. In order to study how the nickel-to-molybdenum ratio affects the efficiency of the electrode, different ratios between Ni-Mo were prepared and tested as supercapacitor electrodes, namely in the following ratios: 1:1, 1:2, 1:3, 1:4, and 1:5. X-ray diffraction, X-ray photoelectron spectroscopy, FESEM, HRTEM, and BET devices were extensively used to analyze the structure of the nanocomposites. The structure of the prepared nickel molybdates was discovered to be 2D hierarchical nanosheets, which functionalized the carbon surface. Among all of the electrodes, the best molar ratio between Ni-Mo was found to be 1:3 NiMo3/AC reaching (541 F·g−1) of specific capacitance at a current density of 1 A·g−1, and 67 W·h·Kg−1 of energy density at a power density of 487 W·Kg−1. Furthermore, after 4000 repetitive cycles at a large current density of 4 A·g−1, an amazing capacitance stability of 97.7% was maintained. This remarkable electrochemical activity for NiMo3/AC could be credited towards its 2D hierarchical structure, which has a huge surface area of 1703 m2‧g−1, high pore volume of 0.925 cm3‧g−1, and large particle size distribution.

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Design of Self-Supported Flexible Nanostars MFe-LDH@ Carbon Xerogel-Modified Electrode for Methanol Oxidation

Cited by 12 publications

References 68 publications

Flower-like Layered NiCu-LDH/MXene Nanocomposites as an Anodic Material for Electrocatalytic Oxidation of Methanol

Flower-like Layered NiCu-LDH/MXene Nanocomposites as an Anodic Material for Electrocatalytic Oxidation of Methanol

In Situ Reconstructed Layered Double Hydroxides via MOF Engineering and Ru Doping for Decoupled Acidic Water Oxidation Enhancement

2D Hierarchical NiMoO4 Nanosheets/Activated Carbon Nanocomposites for High Performance Supercapacitors: The Effect of Nickel to Molybdenum Ratios

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