Molecular Dye-Sensitized Photocatalysis with Metal-Organic Framework and Metal Oxide Colloids for Fuel Production

Stanley, Philip M.; Warnan, Julien

doi:10.3390/en14144260

Cited by 12 publications

(11 citation statements)

References 62 publications

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“…The result presented in Figure 4E implied that the prepared bCDs@Cr-MOF possesses a strong fluorescence intensity that can be used for the quantification of uric acid, which may be determined by the different degrees of the inner filter effect. 53,54 As shown in Figure 4F, the bCD@Cr-MOF probe was quenched by a micromolar concentration range of uric acid, which can be used for the quantification of uric acid as a target molecule selectively, in a manner that exhibited good linearity from 20 to 45 μM, 1.29 μM as LOD and 3.8 μM as LOQ (Figure 4F). Table 1 shows a comparison between commonly reported articles in the literature and our proposed assay.…”

Section: Resultsmentioning

confidence: 96%

Selectivity Enhancement for Uric Acid Detection via In Situ Preparation of Blue Emissive Carbon Dots Entrapped in Chromium Metal–Organic Frameworks

Shatery

Omer

2022

ACS Omega

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In the present work, for the first time, the in situ formation of blue emissive carbon dots (bCDs) and encapsulation into the pores of chromium-based metal–organic frameworks (Cr-MOFs) are described. The luminescent bCDs via in situ process are formed and entrapped inside the pores of Cr-MOFs to form a nanocomposite of bCDs@Cr-MOFs. The bCDs@Cr-MOFs showed a strong broad blue emission at 420 nm (excited at 310 nm), which corresponds to both, the ligand (2-aminoterephthalic acid) in the Cr-MOF and the entrapped bCDs. This is assigned for the entrapping of bCDs in the pores of the MOFs. Additionally, transmission electron microscopy (TEM) images showed two types of particles, 150 rod-like shapes for Cr-MOF and 5–10 nm spherical shapes assigned for the presence of bCDs. The bCDs alone (without Cr-MOF) showed no selectivity, and their emission was quenched by different biomolecules and ions, such as ascorbic acid, uric acid, Fe 3+ , Cu 2+ , and Hg 2+ . The selectivity of bCDs toward uric acid was increased dramatically when they were encapsulated in the Cr-MOF. The linear range for uric acid was 20–50 μM, and the LOD was measured as 1.3 μM. Spike recoveries for the detection of uric acid in serum samples were between 94 and 108%. The relative standard deviation (RSD, n = 3) at each concentration value was less than 2%. The results showed high ruggedness and robustness of the assay due to its high shelf-life stability of probe (four weeks), water stability, and long working pH range. Validation experiments showed that the established MOF-based sensing system is appropriate for uric acid detection in real samples.

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Section: Resultsmentioning

confidence: 96%

Selectivity Enhancement for Uric Acid Detection via In Situ Preparation of Blue Emissive Carbon Dots Entrapped in Chromium Metal–Organic Frameworks

Shatery

Omer

2022

ACS Omega

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“…MOFs are a class of crystalline porous materials constituted by rigid and even flexible organic ligands coordinated through Coulombic and/or coordinative bonds to metal ions or metal clusters. − Initially, MOFs were tested for gas adsorption and separation, − but immediately the potential of these materials in other areas and particularly for catalysis and photocatalysis was recognized. − Particularly, the use of MOFs as photocatalysts has attracted a large interest due to the combination of unique properties that MOFs meet. − Among them, the most important ones are light harvesting by tunable organic linkers and efficient charge separation due to the intimate contact between the linkers and nodal metals. , The reader is referred to some existing reviews dealing with the MOFs as photocatalysts for different applications other than OWS, including water treatment, − pollutant degradation, ,− and solar fuels ,,− production among others. − …”

Section: Mofs As Photocatalysts For Ows Under Visible Light Irradiationmentioning

confidence: 99%

Metal–Organic Frameworks as Photocatalysts for Solar-Driven Overall Water Splitting

et al. 2022

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Metal–organic frameworks (MOFs) have been frequently used as photocatalysts for the hydrogen evolution reaction (HER) using sacrificial agents with UV–vis or visible light irradiation. The aim of the present review is to summarize the use of MOFs as solar-driven photocatalysts targeting to overcome the current efficiency limitations in overall water splitting (OWS). Initially, the fundamentals of the photocatalytic OWS under solar irradiation are presented. Then, the different strategies that can be implemented on MOFs to adapt them for solar photocatalysis for OWS are discussed in detail. Later, the most active MOFs reported until now for the solar-driven HER and/or oxygen evolution reaction (OER) are critically commented. These studies are taken as precedents for the discussion of the existing studies on the use of MOFs as photocatalysts for the OWS under visible or sunlight irradiation. The requirements to be met to use MOFs at large scale for the solar-driven OWS are also discussed. The last section of this review provides a summary of the current state of the field and comments on future prospects that could bring MOFs closer to commercial application.

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“…Figure 2A shows a chemical structure of murexide used in this investigation as a capping and dispersing agent. The approach developed in this investigation was based on colloidal processing, which offers benefits for the fabrication of materials with advanced microstructures [36][37][38][39]. In colloidal processing methods, advanced capping agents and dispersants are necessary for the synthesis of nanomaterials and the fabrication of advanced composites.…”

Section: Characterization Techniquesmentioning

confidence: 99%

Facile Route for Fabrication of Ferrimagnetic Mn3O4 Spinel Material for Supercapacitors with Enhanced Capacitance

Nawwar

Zhitomirsky

2022

Energies

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The purpose of this investigation was the development of a new colloidal route for the fabrication of Mn3O4 electrodes for supercapacitors with enhanced charge storage performance. Mn3O4-carbon nanotube electrodes were fabricated with record-high capacitances of 6.67 F cm−2 obtained from cyclic voltammetry tests at a scan rate of 2 mV s−1 and 7.55 F cm−2 obtained from the galvanostatic charge–discharge tests at a current density of 3 mA cm−2 in 0.5 M Na2SO4 electrolyte in a potential window of 0.9 V. The approach involves the use of murexide as a capping agent for the synthesis of Mn3O4 and a co-dispersant for Mn3O4 and carbon nanotubes. Good electrochemical performance of the electrode material was achieved at a high active mass loading of 40 mg cm−2 and was linked to a reduced agglomeration of Mn3O4 nanoparticles and efficient co-dispersion of Mn3O4 with carbon nanotubes. The mechanisms of murexide adsorption on Mn3O4 and carbon nanotube are discussed. With the proposed method, the time-consuming electrode activation procedure for Mn3O4 electrodes can be avoided. The approach developed in this investigation paves the way for the fabrication of advanced cathodes for asymmetric supercapacitors and multifunctional devices, combining capacitive, magnetic, and other functional properties.

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Molecular Dye-Sensitized Photocatalysis with Metal-Organic Framework and Metal Oxide Colloids for Fuel Production

Cited by 12 publications

References 62 publications

Selectivity Enhancement for Uric Acid Detection via In Situ Preparation of Blue Emissive Carbon Dots Entrapped in Chromium Metal–Organic Frameworks

Selectivity Enhancement for Uric Acid Detection via In Situ Preparation of Blue Emissive Carbon Dots Entrapped in Chromium Metal–Organic Frameworks

Metal–Organic Frameworks as Photocatalysts for Solar-Driven Overall Water Splitting

Facile Route for Fabrication of Ferrimagnetic Mn3O4 Spinel Material for Supercapacitors with Enhanced Capacitance

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