Effects of electron-donating groups on the photocatalytic reaction of MOFs

Li, Shixiong; Sun, Sheng-Li; Wu, Haixia; Wei, Chaohai; Hu, Yun

doi:10.1039/c7cy02622f

Cited by 67 publications

(49 citation statements)

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“…MOFs are a series of highly porous crystalline materials, which composed of organic linkers and metal ions (or clusters). Which are widely studied in the field of OER, because they have high porosity, large surface area, and high flexibility in structure regulation . In recent years, multi‐transition metal element MOF catalysts have attracted much attention due to their important role in replacing precious metals, increased catalytic activity and selectivity .…”

Section: Introductionmentioning

confidence: 99%

In‐situ Growth of a Bimetallic Cobalt‐Nickel Organic Framework on Iron Foam: Achieving the Electron Modification on a Robust Self‐supported Oxygen Evolution Electrode

Luo

Zhao

et al. 2019

ChemCatChem

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As a clean energy source, hydrogen may be obtained via overall water splitting. However, the reaction is limited by the anodic oxygen evolution reaction (OER) in the catalytic field. In order to overcome the limitation in OER catalyst activity, this paper attempts to synthesize and develop a series of three-dimensional metal-organic frameworks (MOFs) electrocatalytic materials. The structure and morphology of bimetallic cobalt and nickel MOFs are characterized by FT-IR, Raman, SEM, TEM, and XPS. It is found that the bimetallic cobalt and nickel MOFs have a columnar micro-structure assembled by nanosheets. Further in-situ growth on the iron (Fe) foam to prepare an integrated nanoarray self-supported electrode did not significant change their micro-structure. The obtained bimetal electrocatalysts exhibit significantly enhanced OER activity as compared to the single-metal MOFs counterpart. The cobalt and nickel doubledoped materials in-situ grown on Fe foam exhibited an excellent electrocatalytic activity and remarkable durability with a current density of 10 mA cm À 2 in a 0.1 M KOH solution (with the overpotential of 264 mV and the Tafel slope of 54.3 mV dec À 1 ). There is a significant improvement compared with the material on the glassy carbon electrode. The introduction of the bimetal species (Co and Ni) into the ordered MOFs provides a synergistic effect of the active centers resulting in an enhanced electron transfer and improved electrochemical performance. This work enriches the MOFs electrocatalytic electrode and pave the way for their practical applications.[a] Dr.Reagent: All reagents and materials in this experiment were obtained commercially and were used as received without any further purification. 1,2,4,5-Benzenetetracarboxylic acid (H 4 btec 98 %, AR), NiCl 2 ·6H 2 O (98 %, AR), CoCl 2 ·6H 2 O (98 %, AR), NaOH (96 %, AR), KOH (96 %, AR) and the Nafion solution (5 wt.%) were purchased from J&K Chemical Co. The ultrapure water (18 MΩ cm) was supplied by a Millipore System (Millipore Q). The thickness of iron foam was 0.5 mm. Synthesis of [M 2 (btec)(H 2 O)4]·2H 2 O (M = Ni and Co):The [M 2 (btec) (H 2 O) 4 ]·2H 2 O was synthesized via a hydrothermal process, as previously reported and with minor modifications. [44] The specific synthesis process is as follows: 1.4 mmol of MCl 2 ·6H 2 O (M: Co, Ni, or Co/Ni mixed with 1 : 1 in at.%) and 0.94 mmol of H 4 btec were dissolved in 10 mL ultrapure water, then the pH was adjusted by 2.2 mmol of NaOH. Afterwards, the as-prepared mixture solution was transferred into a 25 mL Teflon stainless-steel autoclave, and heated at 110°C for 72 h. After that, the autoclave was cooled to room temperature, the as-prepared three-dimensional (3D) MOFs were collected after being washed with ultrapure water and dried at 60°C in an oven. The as-obtained red crystals of 3D-CoMOFs were obtained with a yield of 78.6 %, the green crystals of 3D-NiMOFs with a yield of 85.2 %, and the brown crystals of 3DÀ Co/ NiMOFs with a yield of 80.6 %, respectively ( Figure S1). In-situ synthe...

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Section: Introductionmentioning

confidence: 99%

In‐situ Growth of a Bimetallic Cobalt‐Nickel Organic Framework on Iron Foam: Achieving the Electron Modification on a Robust Self‐supported Oxygen Evolution Electrode

Luo

Zhao

et al. 2019

ChemCatChem

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“…The results of UV‐Vis DRS (Figure ), Zeta potential, and the photocatalytic degradation of phenanthrene in water both proved that the stronger that does not participate in the coordination the electron‐donating groups in MIL‐101(Fe)−X and UIO‐66‐X (X=−OH, −NH 2 , −COOH, −NO 2 and −H), the better the photocatalytic efficiency. The catalytic efficiency followed an order of −OH>−NH 2 >−COOH>−NO 2 >−H . We refer the phenomenon that the electron‐donating group that does not participate in the coordination of the MOFs affecting the photocatalytic activity as the regulation rule of the electron‐donating group.…”

Section: Strategies For Improving the Photocatalytic Performance Of Mofsmentioning

confidence: 99%

“…The UV-Vis DRS of (a) MIL-101(Fe)-X and (b) UIO-66-X (X =-OH, -NH 2 , -COOH, -NO 2 , and -H). Reproduced with permission from Ref [162]…”

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Strategies for Improving the Performance and Application of MOFs Photocatalysts

Luo

Wu³

et al. 2019

ChemCatChem

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Residual pollutants in the water treatment process restrict the advanced treatment and purification of wastewater, because most of them have stable structures, and some are not easily to be enriched. Photocatalytic oxidation technology can directly use solar energy to drive a series of chemical reactions, which has advantages such as low energy consumption, mild reaction conditions and rarely secondary pollution. It is an effective way to solve the organic pollution problem in wastewater treatment. The key to this process is to find and design efficient photocatalysts. The current photocatalytic materials mainly include inorganic semiconductors and metal organic frameworks (MOFs). They have been studied for pollutants degradation, hydrogen evolution, CO2 reduction, and organic transformation. But, most of these catalysts have not been used in real application. In this paper, recent research advances in MOFs photocatalysts and the key factors affecting their photocatalytic efficiency were critically reviewed. It is believed that the pursuit of more efficient photocatalyst needs to be considered from the adsorption‐photocatalytic mechanism, redox‐free radical mechanism, valence‐level regulation mechanism and energy transfer mechanism of photocatalysis. It is very necessary to research and develop nanoscale and quantum level mixed valence MOFs photocatalysts, which are constructed by strong electron‐donating groups.

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“…Synthesis of MIL-101(Fe). MIL-101(Fe) nanopolyhedrons were prepared by a hydrothermal method based on the reported procedure with some modifications [18]. Specifically, 0.675 g of FeCl 3 •6H 2 O (2.5 mmol) and 0.21 g TPA (1.25 mmol) were mixed in 20 mL DMF, and the mixture was ultrasonicated for 20 min to make the solid full suspension.…”

Section: Introductionmentioning

confidence: 99%

Facile Synthesis of Fe₂O₃ Nanomaterials from MIL-101(Fe) Template and Its Application in Lithium Ion Batteries

Qin

Tian

et al. 2019

Journal of Nanomaterials

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Sponge-like porous Fe2O3 nanomaterials were obtained through the calcination process of the iron-based metal organic framework (MIL-101). As anode materials for lithium-ion batteries, thus, obtained products show a good electrochemical performance with a high specific capacity (1358 mA h g-1 at 100 mA g-1 in the initial cycle) and a relatively stable cycle performance (750 mA h g-1 after 80 charge/discharge cycles). The superior cycling performance may be attributed to their special structure, which facilitates charge transfer and Li+ diffusion.

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Effects of electron-donating groups on the photocatalytic reaction of MOFs

Abstract: Regulating the synthesis of photocatalytic materials at the molecular level could affect the absorption of light and guide the synthesis of highly efficient photocatalysts for the photocatalytic degradation organic pollutants.

Cited by 67 publications

References 84 publications

In‐situ Growth of a Bimetallic Cobalt‐Nickel Organic Framework on Iron Foam: Achieving the Electron Modification on a Robust Self‐supported Oxygen Evolution Electrode

In‐situ Growth of a Bimetallic Cobalt‐Nickel Organic Framework on Iron Foam: Achieving the Electron Modification on a Robust Self‐supported Oxygen Evolution Electrode

Strategies for Improving the Performance and Application of MOFs Photocatalysts

Facile Synthesis of Fe₂O₃ Nanomaterials from MIL-101(Fe) Template and Its Application in Lithium Ion Batteries

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Effects of electron-donating groups on the photocatalytic reaction of MOFs

Abstract: Regulating the synthesis of photocatalytic materials at the molecular level could affect the absorption of light and guide the synthesis of highly efficient photocatalysts for the photocatalytic degradation organic pollutants.

Cited by 67 publications

References 84 publications

In‐situ Growth of a Bimetallic Cobalt‐Nickel Organic Framework on Iron Foam: Achieving the Electron Modification on a Robust Self‐supported Oxygen Evolution Electrode

In‐situ Growth of a Bimetallic Cobalt‐Nickel Organic Framework on Iron Foam: Achieving the Electron Modification on a Robust Self‐supported Oxygen Evolution Electrode

Strategies for Improving the Performance and Application of MOFs Photocatalysts

Facile Synthesis of Fe2O3 Nanomaterials from MIL-101(Fe) Template and Its Application in Lithium Ion Batteries

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Facile Synthesis of Fe₂O₃ Nanomaterials from MIL-101(Fe) Template and Its Application in Lithium Ion Batteries