Performance of ZIF-67 – Derived fold polyhedrons for enhanced photocatalytic hydrogen evolution

Li, Yanbing; Jin, Zhiliang; Zhao, Tiansheng

doi:10.1016/j.cej.2019.123051

Cited by 183 publications

(92 citation statements)

References 64 publications

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“…The O1si n XPS appearst wo peaks at 531.5 (CoÀO) and 532.6 eV (H 2 O) in Figure S17e. [40,47,48] Compared with ZIF-67f or composite nanomaterials, the XPS of Ch as an additional peak at about2 85 eV, resultingf rom the presence of CÀNb onds, which confirmt hat graphitic carbon has been adsorbed Na toms. As is well-known that graphitic carbon doping Ni mprovese lectronic transmission.…”

Section: Resultsmentioning

confidence: 87%

“…At 1577a nd 1596 cm À1 ,c lear absorption signals belong to the C=Nb ond and C=Cs tretching vibration. [39,40] The apparent absorption peaks of POMs are located at 700-1100 cm À1 and are assigned to MoÀO d ,M o ÀO b ÀMo, MoÀO c ÀMo, PÀO a ,r espectively.A st he number of Va toms increases, the vibration peak will shift slightly.T he resultsa re consistent with previous reports. [42,43] In the composite nanomaterials, the characteristic peaks are all existence, which indicated that ZIF-67 and POMs are successfully compounded.A sw ell, there is as light red shift of the characteristic peaks, owing to the interactions of the ZIF-67 frameworks with POMs anion.…”

Section: Resultsmentioning

confidence: 99%

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Keggin‐Type Polyoxometalate‐Based ZIF‐67 for Enhanced Photocatalytic Nitrogen Fixation

Wang

et al. 2020

ChemSusChem

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The photocatalytic reduction of N2 to NH3 is considered a promising strategy to alleviate human need for accessible nitrogen and environmental pollution, for which developing a photocatalyst is an effective method to complete the transformation of this process. We firstly design a series of highly efficient and stable polyoxometalates (POMs)‐based zeolitic imidazolate framework‐67 (ZIF‐67) photocatalysts for N2 reduction. ZIF‐67 can effectively fix N2 owing to its porosity. Integration of POMs cluster contributes enormous advantages in terms of broadening the absorption spectrum to improve sunlight utilization, enhance the stability of the materials, effectively inhibit the recombination of photo‐generated electron–hole pairs, and reduce charge‐transfer impedance. POMs can absorb light to convert into reduced POMs, which have stronger reducing ability to provide ample electrons to reduce N2. The reduced POMs can recover their oxidation state through contact with an oxidant, which forms a self‐recoverable and recyclable photocatalytic fixing N2 system. The photocatalytic activity enhances with the increasing number V substitutions in the POMs. Satisfactorily, ZIF‐67@K11[PMo4V8O40] (PMo4V8) displays the most significant photocatalytic N2 activity with a NH3 yield of 149.0 μmol L−1 h−1, which is improved by 83.5 % (ZIF‐67) and 78.9 % (PMo4V8). The introduction of POMs provides new insights for the design of high‐performance photocatalyst nanomaterials to reduce N2.

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Section: Resultsmentioning

confidence: 87%

Section: Resultsmentioning

confidence: 99%

Keggin‐Type Polyoxometalate‐Based ZIF‐67 for Enhanced Photocatalytic Nitrogen Fixation

Wang

et al. 2020

ChemSusChem

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“…S2, ESI † shows the PL spectra of the Co-MOF-based ZIF-67 synthesized with different solvents excited by a laser source at a wavelength of 490 nm. 39 The PL spectra show emitted light in the range of 540 to 630 nm.…”

Section: Resultsmentioning

confidence: 99%

Cobalt metal–organic framework-based ZIF-67 for the trace determination of herbicide molinate by ion mobility spectrometry: investigation of different morphologies

et al. 2021

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“…Figure 5b illustrates that all the catalysts showcased similar absorption curves from 400 to 600 nm, showing the visible light response range of EY dye [45]. The maximum absorption wavelength was observed at 518 nm, which was assigned to the n-π* transition of C=O bond in the EY molecular structure [46,47].…”

Section: Xps Analysismentioning

confidence: 79%

“…As shown in Fig. 4c, the high-resolution XPS spectrum of Co 2p in CoAl LDH can be divided into six evident peaks with band energies of 781.1, 783.1, 786.6, 796.8, 798.1, and 803.4 eV; the band energy at 781.1 eV was attributed to Co 2p 3/2 and that at 796.8 eV to Co 2p 1/2 of Co 2+ ; the band energies at 786.6 and 803.4 eV belonged to the corresponding satellite peaks of Co 2p 3/2 and Co 2p 1/2 , respectively, and the band energy at 783.1 eV was indicative of cobalt(III), and that at 798.1 eV corresponded to cobalt(II) [40][41][42][43][44][45][46]. Figure 5 shows the UV-Vis diffuse reflectance spectra and UV-Vis absorption spectra of CoAl LDH, Ni-MOF-74, and CoAl@MOF-2 samples.…”

Section: Xps Analysismentioning

confidence: 98%

CoAl LDH@Ni-MOF-74 S-Scheme Heterojunction for Efficient Hydrogen Evolution

Jin

2020

Trans. Tianjin Univ.

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Metal-organic frameworks (MOFs) and layered double hydroxides (LDHs) have been considered to be one of the most promising and worthy hot spot materials to develop advanced catalysts for efficient hydrogen evolution due to their prominent characteristics, including unique structures, environmentally friendly nature, high redox activities, and homogeneously effective utilization of transition metal atoms. In this work, the delicate S-scheme heterojunction photocatalyst, CoAl LDH@ Ni-MOF-74, was rationally designed and successfully constructed by coupling Ni-MOF-74 with CoAl LDH based on their peculiar structure, excellent electronic properties, and opposite surface potential for enhancing hydrogen generation activity under visible light irradiation. The CoAl LDH nanolayers evenly and dispersedly load on the surface of Ni-MOF-74. The CoAl LDH@Ni-MOF-74 exhibited higher photocatalytic hydrogen evolution activity compared with Ni-MOF-74 and CoAl LDH alone, mainly because the formation of the CoAl LDH@Ni-MOF-74 S-scheme heterojunction accelerated the recombination of several electrons (from conduction band (CB) of Ni-MOF-74) and holes (from valence band (VB) of CoAl LDH) and prevented the recombination of other electrons (from CB of CoAl LDH) and holes (from VB of Ni-MOF-74).

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Performance of ZIF-67 – Derived fold polyhedrons for enhanced photocatalytic hydrogen evolution

Cited by 183 publications

References 64 publications

Keggin‐Type Polyoxometalate‐Based ZIF‐67 for Enhanced Photocatalytic Nitrogen Fixation

Keggin‐Type Polyoxometalate‐Based ZIF‐67 for Enhanced Photocatalytic Nitrogen Fixation

Cobalt metal–organic framework-based ZIF-67 for the trace determination of herbicide molinate by ion mobility spectrometry: investigation of different morphologies

CoAl LDH@Ni-MOF-74 S-Scheme Heterojunction for Efficient Hydrogen Evolution

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