Physicochemical and electrochemical characterization of Ce/carbonaceous matrices-based composites

Santos, Patrícia Ferreira dos; Ribeiro, Josimar; Luz, Priscilla Paiva

doi:10.1016/j.solidstatesciences.2020.106479

Cited by 9 publications

(3 citation statements)

References 56 publications

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“…To gain a deeper understanding of the OER activity, Tafel plots are shown in Figure d, and the slopes were obtained by the Tafel equation . The Tafel slopes of NiS/NiS 2 -350, i.e., 106 mV/dec in 0.5 M H 2 SO 4 solution and 114 mV/dec in 1 M KOH solution, are smaller than those of NiS/NiS 2 -250 and NiS/NiS 2 -450, respectively.…”

Section: Resultsmentioning

confidence: 99%

Electrocatalytic Hydrogen Production and Synergistic Formaldehyde Degradation

Hao,

Zhang,

Teng

et al. 2023

ACS Appl. Energy Mater.

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This study reports a simple molten salt method for the largescale synthesis of NiS/NiS 2 heterostructures. The NiS/NiS 2 sample obtained at 350 °C exhibits a high hydrogen evolution reaction (HER) activity. At 10 mA cm −2 , low HER overpotentials are required for NiS/NiS 2 in both acidic (196 mV) and alkaline electrolytes (161 mV). Furthermore, density functional theory (DFT) calculations demonstrate that NiS/NiS 2 , with an optimized electron structure, presents a significantly lower Gibbs free energy for hydrogen adsorption (0.201 eV), compared with single NiS (0.413 eV) and single NiS 2 (0.953 eV). This suggests that the NiS/NiS 2 heterostructure enables more favorable thermodynamics for hydrogen adsorption/desorption. In addition, an electrolyzer was assembled using NiS/NiS 2 as the electrodes and formaldehyde as an electrolyte solution. It was observed that in a neutral electrolyte, the required cell voltage of a formaldehyde-based electrolyzer (2.52 V) at 10 mA cm −2 was 0.33 V lower than that of a conventional water-based one (2.85 V). The cell voltage has decreased by 11.6%, demonstrating that the electrolyzer is highly energy-efficient. Also, the formaldehyde-based electrolyzer has a higher Faradaic efficiency (FE) of 80.17%, compared to the water-based electrolyzer (73.58%). Moreover, 90.4% of formaldehyde is degraded after running for 2 h at a cell voltage of 3 V. This study confirms that this innovative electrolyzer can not only efficiently degrade formaldehyde but also simultaneously produce hydrogen with a lower energy consumption. This work presents an innovative strategy for both wastewater treating and green hydrogen production.

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Section: Resultsmentioning

confidence: 99%

Electrocatalytic Hydrogen Production and Synergistic Formaldehyde Degradation

Hao,

Zhang,

Teng

et al. 2023

ACS Appl. Energy Mater.

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“…They have also been developed as catalysts [ 31 ], in thermometry [ 32 , 33 ], and in biological applications [ 34 , 35 , 36 , 37 , 38 ]. Additionally, the combination of RE-MOFs with polymeric structures could produce brand-new composite materials that merge the exceptional properties of MOFs with the features of the polymer supports [ 39 , 40 , 41 , 42 ].…”

Section: Introductionmentioning

confidence: 99%

Green Ultrasound-Assisted Synthesis of Rare-Earth-Based MOFs

Lo Presti,

Pellegrino,

Consoli

et al. 2023

Molecules

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Rare-earth (RE)-based metal organic frameworks (MOFs) are quickly gaining popularity as flexible functional materials in a variety of technological fields. These MOFs are useful for more than just conventional uses like gas sensors and catalyst materials; in fact, they also show significant promise in emerging technologies including photovoltaics, optical, and biomedical applications. Using yttrium and europium as ionic host centres and dopants, respectively, and 1,3,5-benzenetricarboxylic acid (H3-BTC) as an organic linker, we describe a simple and green approach for the fabrication of RE-MOFs. Specifically, Y-BTCs and Eu-doped Y-BTCs MOFs have been synthesised in a single step using an eco-friendly method that makes use of ultrasound technology. To establish a correlation between the morphological and structural properties and reaction conditions, a range of distinct reaction periods has been employed for the synthetic processes. Detailed analyses of the synthesised samples through powder X-ray diffraction (PXRD), field emission scanning electron microscopy (FE-SEM), and Fourier-transform infrared spectroscopy (FT-IR) have confirmed the phase formation. Furthermore, thermal analyses such as thermogravimetric analysis (TGA) have been employed to evaluate the thermal stability and structural modifications of the Y-BTC and Eu-doped Y-BTC samples. Finally, the luminescent properties of the synthesised samples doped with Eu3+ have been assessed, providing an evaluation of their characteristics. As a proof of concept, an Eu-doped Y-BTC sample has been applied for the sensing of nitrobenzene as a molecule test of nitro derivatives.

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“…Em estudos recentes de Santos e Luz (2020) indicaram que a temperatura usada na síntese da Ce-BTC interfere na morfologia, dimensões e homogeneidade das partículas (63,79). A morfologia das partículas está relacionada aos elementos de simetria, sistema cristalino, grupo de espaço e empacotamento.…”

Section: Microscopia Eletrônica De Varredura -Mevunclassified

Redução de fuligem por ceria obtida na decomposição térmica de polímeros inorgânicos

Gomes¹

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Physicochemical and electrochemical characterization of Ce/carbonaceous matrices-based composites

Cited by 9 publications

References 56 publications

Electrocatalytic Hydrogen Production and Synergistic Formaldehyde Degradation

Electrocatalytic Hydrogen Production and Synergistic Formaldehyde Degradation

Green Ultrasound-Assisted Synthesis of Rare-Earth-Based MOFs

Redução de fuligem por ceria obtida na decomposição térmica de polímeros inorgânicos

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