Highly Porous MIL-100(Fe) for the Hydrogen Evolution Reaction (HER) in Acidic and Basic Media.
21 Jul 2020-Vol. 5, Iss: 30, pp 18941-18949
TL;DR: The present study reports the synthesis of a porous Fe-based MOF named MIL-100(Fe) by a modified hydrothermal method without the HF process, demonstrating as an excellent electrocatalyst for the hydrogen evolution reaction investigated in both acidic and alkaline media.
Abstract: The present study reports the synthesis of a porous Fe-based MOF named MIL-100(Fe) by a modified hydrothermal method without the HF process. The synthesis gave a high surface area with the specific surface area calculated to be 2551 m2 g-1 and a pore volume of 1.407 cm3 g-1 with an average pore size of 1.103 nm. The synthesized electrocatalyst having a high surface area is demonstrated as an excellent electrocatalyst for the hydrogen evolution reaction investigated in both acidic and alkaline media. As desired, the electrochemical results showed low Tafel slopes (53.59 and 56.65 mV dec-1), high exchange current densities (76.44 and 72.75 mA cm-2), low overpotentials (148.29 and 150.57 mV), and long-term stability in both media, respectively. The high activity is ascribed to the large surface area of the synthesized Fe-based metal-organic framework with porous nature.
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TL;DR: Testing of the porous metal-organic framework (MOF) Basolite®F300 (Fe-BTC) was tested as a potential drug-releasing depot to enhance the solubility of the anticancer drug paclitaxel (PTX) and to prepare controlled release formulations after its encapsulation in amphiphilic methoxy poly(ethylene glycol)-poly(ε-caprolactone) (mPEG-PCL) nanoparticles.
Abstract: In the present work, the porous metal-organic framework (MOF) Basolite®F300 (Fe-BTC) was tested as a potential drug-releasing depot to enhance the solubility of the anticancer drug paclitaxel (PTX) and to prepare controlled release formulations after its encapsulation in amphiphilic methoxy poly(ethylene glycol)-poly(e-caprolactone) (mPEG-PCL) nanoparticles. Investigation revealed that drug adsorption in Fe-BTC reached approximately 40%, a relatively high level, and also led to an overall drug amorphization as confirmed by differential scanning calorimetry (DSC) and X-ray diffraction (XRD). The dissolution rate of PTX-loaded MOF was substantially enhanced achieving a complete (100%) release within four days, while the neat drug only reached a 13% maximum rate (3–4 days). This PTX-Fe-BTC nanocomposite was further encapsulated into a mPEG-PCL matrix, a typical aliphatic amphiphilic copolyester synthesized in our lab, whose biocompatibility was validated by in vitro cytotoxicity tests toward human umbilical vein endothelial cells (HUVEC). Encapsulation was performed according to the solid-in-oil-in-water emulsion/solvent evaporation technique, resulting in nanoparticles of about 143 nm, slightly larger of those prepared without the pre-adsorption of PTX on Fe-BTC (138 nm, respectively). Transmission electron microscopy (TEM) imaging revealed that spherical nanoparticles with embedded PTX-loaded Fe-BTC nanoparticles were indeed fabricated, with sizes ranging from 80 to 150 nm. Regions of the composite Fe-BTC-PTX system in the infrared (IR) spectrum are identified as signatures of the drug-MOF interaction. The dissolution profiles of all nanoparticles showed an initial burst release, attributed to the drug amount located at the nanoparticles surface or close to it, followed by a steadily and controlled release. This is corroborated by computational analysis that reveals that PTX attaches effectively to Fe-BTC building blocks, but its relatively large size limits diffusion through crystalline regions of Fe-BTC. The dissolution behaviour can be described through a bimodal diffusivity model. The nanoparticles studied could serve as potential chemotherapeutic candidates for PTX delivery.
17 citations
Cites background from "Highly Porous MIL-100(Fe) for the H..."
...The MIL-100(Fe) and Fe-BTC structures consist of similar building blocks with the former material being crystalline [54,55]....
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TL;DR: In this paper , the authors summarize recent progress in carbon-based electrode material in Li-S batteries, the development of electrolytes, and progress in adopting lithium-sulfur batteries as flexible devices.
Abstract:
Lithium-sulfur batteries are among the rising rechargeable batteries due to their high energy density, theoretical capacity, and low cost. However, their large-scale application is delayed by several challenges, such as degradation due to polysulfide dissolution, low conductivity, and other restricting factors. Li-S batteries have undergone decades of development aimed at improving battery performance by altering the electrode material to overcome these challenges. In the meantime, due to the depletion of fossil fuels and growing energy demand, the need for changes in processes to improve battery performance is now more urgent than ever. Carbon-based materials like conducting polymers, carbon nanotubes, Graphene, and activated Carbon have gained extensive attention due to their low cost, easy availability, good cycling stability, and exceptional electrical, thermal, and mechanical properties. Here, we summarize recent progress in carbon-based electrode material in Li-S batteries, the development of electrolytes, and progress in adopting lithium-sulfur batteries as flexible devices. Furthermore, a comparison of Li-S batteries based on similar parameters with its rechargeable battery competitors is discussed and a comparison with other non-carbon-based electrodes used in the lithium-sulfur battery is also examined. Finally, a general conclusion and future directions are given.
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TL;DR: In this paper , the authors summarized the state-of-the-art of development of metal-organic frameworks (MILs) on the broad spectrum, highlighting their specificities, such as synthesis techniques, modifications and applications for environmental remediation.
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23 Feb 2021
TL;DR: In this article, a kind of 3D needle branch-like array nanostructured PANI/CoNiP hybrid electrode self-supported on nickle foam (NF) is explored.
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TL;DR: In this article , the authors used MIL-100 nano-composite as the carrier of 5-fluorouracil and Gemcitabine (GEM) and evaluated the anti-cancer activity of these nanocarriers through WST-1 analysis.
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References
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TL;DR: In this paper, the origin, the classification and the effect on catalytic performance of pore texture of heterogeneous catalysts are briefly examined and the techniques and the methods suitable for the determination of related properties (surface area, pore volume and pore size distribution) are reviewed.
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