Strategies for Improving the Performance and Application of MOFs Photocatalysts

Li, Shixiong; Luo, Pei; Wu, Haixia; Wei, Chaohai; Hu, Yun; Qiu, Guanglei

doi:10.1002/cctc.201900199

Cited by 54 publications

(24 citation statements)

References 172 publications

(302 reference 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 synthesis and application of MOF-or COFderived materials are out of scope for this paper, but can be found in recent comprehensive review articles. [80][81][82][83] 2 MOF hybrid photocatalysts for solar-to-chemical energy conversion…”

Section: General Structure and Properties Of Porous Organic Frameworkmentioning

confidence: 99%

Porous framework-based hybrid materials for solar-to-chemical energy conversion: from powder photocatalysts to photoelectrodes

Kim

Ryu

2021

Inorg. Chem. Front.

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“…Among the investigated substituents, a huge number of studies prove the great efficacy of amino groups in extending MOFs absorption to the visible range. Particularly, amino-functionalized Ti-MOFs, including NH 2 -MIL-125(Ti), disclose high performance in a great number of photocatalytic processes, including water purification [235], H 2 production [236], CO 2 reduction [272], as well as organic synthesis [237,238].…”

Section: Ligand Functionalizationmentioning

confidence: 99%

“…This occurs in UiO-66-NH 2 and even in MIL-125(Ti)−NH 2 MOFs, whose already relevant properties can be improved by encapsulating Pd [249], Pt [250], or Au [251]. Accepting photogenerated electrons from inorganic semiconductor clusters, Pt and Au can also act as co-catalysts in redox processes [272]. As an alternative to noble metal nanoparticles, doping with less expensive metals, such as Cu, can also significantly enhance both stability and photocatalytic activity, as a result of the plasmonic phenomenon and metal-semiconductor junction, improving charge mobility and depressing recombination ( Figure 14) [252].…”

Section: Encapsulation Of Photocatalytic Active Species (Mof Compositmentioning

confidence: 99%

Photosensitive Hybrid Nanostructured Materials: The Big Challenges for Sunlight Capture

2020

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Solar radiation is becoming increasingly appreciated because of its influence on living matter and the feasibility of its application for a variety of purposes. It is an available and everlasting natural source of energy, rapidly gaining ground as a supplement and alternative to the nonrenewable energy feedstock. Actually, an increasing interest is involved in the development of efficient materials as the core of photocatalytic and photothermal processes, allowing solar energy harvesting and conversion for many technological applications, including hydrogen production, CO2 reduction, pollutants degradation, as well as organic syntheses. Particularly, photosensitive nanostructured hybrid materials synthesized coupling inorganic semiconductors with organic compounds, and polymers or carbon-based materials are attracting ever-growing research attention since their peculiar properties overcome several limitations of photocatalytic semiconductors through different approaches, including dye or charge transfer complex sensitization and heterostructures formation. The aim of this review was to describe the most promising recent advances in the field of hybrid nanostructured materials for sunlight capture and solar energy exploitation by photocatalytic processes. Beside diverse materials based on metal oxide semiconductors, emerging photoactive systems, such as metal-organic frameworks (MOFs) and hybrid perovskites, were discussed. Finally, future research opportunities and challenges associated with the design and development of highly efficient and cost-effective photosensitive nanomaterials for technological claims were outlined.

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Strategies for Improving the Performance and Application of MOFs Photocatalysts

Cited by 54 publications

References 172 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

Porous framework-based hybrid materials for solar-to-chemical energy conversion: from powder photocatalysts to photoelectrodes

Photosensitive Hybrid Nanostructured Materials: The Big Challenges for Sunlight Capture

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