Controlled Morphological Transformation, Photocatalytic Properties, and Electrocatalytic OER Performance of Fe-MOF Nanopolyhedra

Li, Yao; Song, Le Xin; Wang, Wei Ping; Xia, Juan; Liu, Nan Ning

doi:10.1021/acs.jpcc.1c07710

Cited by 9 publications

(9 citation statements)

References 56 publications

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“…Our data show that the maximum absorption peak of CV before illumination was at about 590 nm . When exposed to light for 3 min, the maximum absorption decreased sharply from 1.77 to 1.29.…”

Section: Resultsmentioning

confidence: 55%

“…Next, we used MO instead of CV to do the comparative experiment. Figure c shows the absorption spectrum of the MO solution with the maximum absorption peak at 463 nm . It is obvious that the ζ value of 1 to MO did not reach 97.4% until 42 min of illumination.…”

Section: Resultsmentioning

confidence: 99%

“…Our data show that the maximum absorption peak of CV before illumination was at about 590 nm. 41 When exposed to light for 3 min, the maximum absorption decreased sharply from 1.77 to 1.29. Moreover, the maximum absorption decreased with the increase in illumination time from 3 to 27 min.…”

Section: Photocatalytic Properties Ofmentioning

confidence: 95%

“…The physical properties of iron-based micro-and nanomaterials, such as iron oxide and Fe-MOF, have been reported extensively. 3,41 In comparison, there are fewer reports describing the properties of FOD micro-and nanostructures. 8 The Journal of Physical Chemistry C pubs.acs.org/JPCC Article One possible reason may be that FOD was easy to crystallize rapidly and form large crystals.…”

Section: Physical and Chemical Properties Ofmentioning

confidence: 99%

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Microspheres of Ferrous Oxalate Dihydrate: Formation, Structure, Physical Properties, and Photocatalytic Activities

et al. 2022

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In the present work, ferrous oxalate dihydrate (FOD) microspheres were prepared by the one-step hydrothermal method using the interaction between ferric chloride and disodium tartrate dihydrate in the presence of β-cyclodextrin (β-CD). Although reaction temperature and time have important effects on the formation of the FOD microspheres, these effects can only be achieved in the presence of β-CD. In the absence of β-CD, the hydrothermal reaction will only form ferrous tartrate (FeTA) nanorods. The role of β-CD is to dominate and promote the time-dependent structural transformation from one Fe(II) complex FeTA to another Fe(II) complex polymer FOD. This discovery is new and meaningful. It provides a new perspective on the synthesis of inorganic micro-and nanomaterials. UV−vis diffuse-reflectance spectra show that these microsphere structures such as 1 and 2 indicate excellent light absorption capacities, including high absorption intensity in a very wide wavelength range (200−1000 nm). Magnetic studies show that these FOD materials exhibit typical paramagnetic properties near room temperature. The correlation between magnetic properties and structures shows that the magnetic similarity of these FOD materials is mainly reflected by the similarity of the surface structure. On the contrary, the difference of magnetism is more reflected by the difference of the crystal structure. In addition, we also found that these FOD microspheres showed good photocatalytic activity for several different types of organic dyes, including cationic Rhodamine B, Rhodamine 6G, crystal violet, and anionic methyl orange. Based on these meaningful experimental results, we have reason to believe that this work will help stimulate the in-depth study of FOD micro-and nanomaterials in controllable synthesis, physical properties, and photocatalytic applications.

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“…Our data show that the maximum absorption peak of CV before illumination was at about 590 nm . When exposed to light for 3 min, the maximum absorption decreased sharply from 1.77 to 1.29.…”

Section: Resultsmentioning

confidence: 55%

Section: Resultsmentioning

confidence: 99%

Section: Photocatalytic Properties Ofmentioning

confidence: 95%

Section: Physical and Chemical Properties Ofmentioning

confidence: 99%

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Microspheres of Ferrous Oxalate Dihydrate: Formation, Structure, Physical Properties, and Photocatalytic Activities

et al. 2022

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“…Compared with the conventional method without β-CD, the prepared MIL-53 (Fe) has an average size of ≈130 nm, which is significantly smaller than the conventionally prepared samples (500 nm), and benefiting from the size effect, the optimized MIL-53(Fe) exhibited the best OER performance with a lower overpotential of 398 mV at a current density of 10 mA cm −2 . [38]…”

Section: Nanominiaturizationmentioning

confidence: 99%

Metal–Organic Framework‐Based Nanomaterials for Electrocatalytic Oxygen Evolution

et al. 2022

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tion scale and sustainability. [1] The overall water splitting involves a pair of electrochemical reactions occurring at two separate electrodes, that is, the hydrogen evolution reaction (HER) at the cathode and the oxygen evolution reaction (OER) at the anode. [2] In comparison to HER, OER involving four-electron transfer not only possesses a large thermodynamic potential but also leads to serious sluggish kinetics. [3] Thus, it is highly desirable to develop efficient OER catalysts for realizing the large-scale production and widespread use of hydrogen.Noble metal oxides (e.g., IrO 2 and RuO 2 ) have long been regarded as the best OER catalysts due to their high activity. [4] However, the scarcity of these Ir/Ru-based materials results in the cost greatly increases, which seriously hinders their industrial application. [5] Besides, the adsorption of noble metal-based catalysts to oxygen-containing intermediates is relatively strong so that the active sites are easily blocked, leading to their catalytic activity being degraded dramatically. In the past years, a variety of transition metal-based materials have been developed as efficient and cost-effective catalysts for OER. Compared with the traditional metal oxides/hydroxides, nitrides, sulfides, and phosphides, metal-organic framework (MOF)-based materials possess many special advantages in activity improvement and optimization, mass transfer and diffusion, as well as structure-performance relation exploration. For example, MOFs are linked by coordination bonds between organic ligands and metal nodes with periodic structural units, which provides an ideal platform for fundamental catalytic mechanism study. The metal interaction for catalytic performance improvement can be quantitatively presented by precisely controlling the atom species and ratio in MOFs. [6] In addition, the design of ligands in length and coordination atom of MOFs could not only optimize the electron distribution of active sites but also achieve the precise regulation of the pore sizes and surface areas. Apart from the intrinsic design for pure MOFs, composition and functionalization can further improve their physicochemical properties, such as conductivity and wettability, leading to the catalytic activity and stability further boosted during electrocatalysis. [7] Substantial efforts recently have been made to fabricate high-performance catalysts for electrocatalysis by employing MOFs as pyrolytic precursors/ templates. [8] During pyrolysis, the organic carbon framework will be converted into inorganic carbon, and metals can be in Oxygen evolution reaction (OER) is an energy-determined half-reaction for water splitting and many other energy conversion processes, such as rechargeable metal-air batteries and CO 2 reduction, due to its four-electron sluggish process. To reduce the energy consumption and cost of these advanced technologies, various transition metal-based nanomaterials, like metal oxides/hydroxides, nitride, and phosphide are synthesized. Among these, metal-organic framework (...

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Trace to the Source: Self‐Tuning of MOF Photocatalysts

Zhou

Zhang

Xiao

et al. 2023

Advanced Energy Materials

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Benefitting from ultra‐high porosity, large specific surface area (SSA), and rich active sites, metal–organic frameworks (MOFs) have emerged as a star material in energy and environment related applications, especially in photocatalysis. In comparison with conventional photocatalysts, MOFs can be customized in terms of electronic structure, photo‐responsiveness, and morphological dimensions by rational design, which means that MOFs eliminate the need for other species to achieve enhanced photocatalytic performance, such as metals, compounds, and polymers, which may introduce extra costs, be time‐consuming, be multi‐phase, or have an unclear mechanism. Most previous review works related to MOF photocatalysis have mixed self‐tuning and assisted‐tuning, which often gives an incomplete understanding. In this work, the self‐tunning of MOFs by analyzing component (as clusters, ligands, and inclusions), defect (defect engineering, as linkers, clusters, and oxygen vacancies (OVs), and crystal (as facets, dimensions, and amorphization) is summarized. Then, outstanding examples of these strategies applied to water redox, CO2/N2 reduction, organic conversion, and environmental treatment are discussed. Finally, the opportunities and challenges faced in the self‐tuning of MOFs are analyzed from different perspectives. This paper is a comprehensive and systematic review on the self‐tuning of MOFs to enhance photocatalytic activity.

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Controlled Morphological Transformation, Photocatalytic Properties, and Electrocatalytic OER Performance of Fe-MOF Nanopolyhedra

Cited by 9 publications

References 56 publications

Microspheres of Ferrous Oxalate Dihydrate: Formation, Structure, Physical Properties, and Photocatalytic Activities

Microspheres of Ferrous Oxalate Dihydrate: Formation, Structure, Physical Properties, and Photocatalytic Activities

Metal–Organic Framework‐Based Nanomaterials for Electrocatalytic Oxygen Evolution

Trace to the Source: Self‐Tuning of MOF Photocatalysts

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