Utilizing crystals defects to boost metal-organic frameworks hydrogen generation abilities

Zhang, Wei; Wang, Yang; Ling, Lianjie; Wang, Xinpeng; Chang, Hongjuan; Li, Rui; Duan, Wubiao; Liu, Bo

doi:10.1016/j.micromeso.2019.109943

Cited by 11 publications

(15 citation statements)

References 39 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…In the next step, due to thermal decomposition of organic linkers, pristine NH 2 -MIL-125 lost a weight of ∼17.8% between 220 and 450 °C, whereas NH 2 -MIL-125-D lost ∼12.5% within the same temperature window. These results clearly indicate that the defective NH 2 -MIL-125 crystals lost several organic linkers during decarboxylation. , The last step of the weight loss content indicates the combustion of linker/framework (Figure S2a,c).…”

Section: Resultsmentioning

confidence: 83%

“…After decarboxylation, NH 2 -MIL-125-D appeared as a brown colored powder, (Figure S3d), which showed a red shift in the absorption spectra with an extended tail. This might be originating from an intermediate electronic state of Ti 4+ in the indirect band of NH 2 -MIL-125, which is associated with defects . The band gaps from a Kubelka–Munk plot are estimated as 2.78 and 2.63 eV for NH 2 -MIL-125 and NH 2 -MIL-125-D, respectively (Figure S12c).…”

Section: Photophysical Propertiesmentioning

confidence: 99%

“…This is accompanied by disrupting of the periodic arrangement of atoms/ions in the parent structure. On the basis of this concept, Zhang et al reported defect-abundant DA-NH 2 -MIL-125 photocatalysts using a simple defects-utilizing method via dodecanoic acid modulator which showed improvement in photocatalytic H 2 evolution abilities . Zhao et al prepared defected heterojunction NU66-d/ZIS photocatalysts via silver-catalyzed decarboxylation method which exhibits good photocatalytic activity …”

Section: Introductionmentioning

confidence: 99%

“…On the basis of this concept, Zhang et al reported defect-abundant DA-NH 2 -MIL-125 photocatalysts using a simple defects-utilizing method via dodecanoic acid modulator which showed improvement in photocatalytic H 2 evolution abilities. 11 Zhao et al prepared defected heterojunction NU66-d/ZIS photocatalysts via silver-catalyzed decarboxylation method which exhibits good photocatalytic activity. 12 Typically, the charge transfer across the MOF/water interface can be accelerated by implementing a suitable cocatalyst.…”

Section: ■ Introductionmentioning

confidence: 99%

See 3 more Smart Citations

Function of Defects in NH₂-MIL-125@PANI@Co₃O₄ Photocatalyst for Efficient Hydrogen Evolution

Mondal

Mahata

et al. 2022

ACS Appl. Energy Mater.

View full text Add to dashboard Cite

Defect engineering using surface linkage modification is an efficient method to tailor solar-to-chemical energy conversion performance of a metal−organic framework (MOF), albeit the nature and impact of the defects remain unexplored. The present study explored that the alteration of electronic and morphological properties due to linkage modification augments the intrinsic charge transfer in MOF but is not reflected in the overall hydrogen production activity when integrated with a cocatalyst. This is illustrated with the simply prepared judicious bulk heterostructure between defect-regulated NH 2 -MIL-125 and Co 3 O 4 . The study further demonstrates that the subtle use of the photosensitizer can multi-fold improve the activity while anchored onto a semiconductor surface. Several analytical methods including X-ray absorption spectroscopy revealed the unique anchoring of Co 3 O 4 on the MOF surface that pertains to its catalytic activity. The composite Co 3 O 4 @PANI@NH 2 -MIL-125, without defects, showed significant spatial separation of the excited-state charge carriers thereby improving the rate of H 2 evolution reaction (∼1208 μmol h −1 g −1 ), with apparent quantum yield of ∼3% under simulated visible-light irradiation. The separation of photogenerated charge carriers at the MOF/cocatalyst interface was unequivocally confirmed by the time-dependent emission spectra and steady-state electrochemical measurements. The photocatalytic activity is correlated with the compatible charge transfer kinetics and density functional theory calculation on the Co 3 O 4 @NH 2 -MIL-125 heterostructure. Further, femtosecond transient absorption spectroscopy studies revealed the initial photoexcited charge transfer from polyaniline (PANI) to hybrid PANI@NH 2 -MIL-125, which favorably occurs in picoseconds time scale to boost the photocatalytic activity of the system. This investigation will bestow a beneficial blueprint for structural design on MOF to precisely manipulate cocatalyst morphology and structural positions for developing an efficient photocatalyst.

show abstract

Section: Resultsmentioning

confidence: 83%

Section: Photophysical Propertiesmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: ■ Introductionmentioning

confidence: 99%

See 2 more Smart Citations

Function of Defects in NH₂-MIL-125@PANI@Co₃O₄ Photocatalyst for Efficient Hydrogen Evolution

Mondal

Mahata

et al. 2022

ACS Appl. Energy Mater.

View full text Add to dashboard Cite

show abstract

“…117 Different kinds of guest species, such as polyoxometalates (POMs) and metal nanoparticles (NPs) have been successfully incorporated into defective MOFs. [37][38][39]117,122,123 For example, Keggin-type POMs conned in defective UiO-66 were prepared via a one-pot method with an in situ addition of thiourea (Fig. 11c).…”

Section: Catalysismentioning

confidence: 99%

Synthesis, characterization and application of defective metal–organic frameworks: current status and perspectives

et al. 2020

View full text Add to dashboard Cite

show abstract

Photocatalytic removal of Cr(Ⅵ) and efficient degradation of tetracycline by oxygen-enriched vacancy pie-like NH2-MIL-125(Ti)

Li,

Fang,

et al. 2024

Colloids and Surfaces A: Physicochemical and Engineering Aspect

View full text Add to dashboard Cite

Utilizing crystals defects to boost metal-organic frameworks hydrogen generation abilities

Cited by 11 publications

References 39 publications

Function of Defects in NH₂-MIL-125@PANI@Co₃O₄ Photocatalyst for Efficient Hydrogen Evolution

Function of Defects in NH₂-MIL-125@PANI@Co₃O₄ Photocatalyst for Efficient Hydrogen Evolution

Synthesis, characterization and application of defective metal–organic frameworks: current status and perspectives

Photocatalytic removal of Cr(Ⅵ) and efficient degradation of tetracycline by oxygen-enriched vacancy pie-like NH2-MIL-125(Ti)

Contact Info

Product

Resources

About

Utilizing crystals defects to boost metal-organic frameworks hydrogen generation abilities

Cited by 11 publications

References 39 publications

Function of Defects in NH2-MIL-125@PANI@Co3O4 Photocatalyst for Efficient Hydrogen Evolution

Function of Defects in NH2-MIL-125@PANI@Co3O4 Photocatalyst for Efficient Hydrogen Evolution

Synthesis, characterization and application of defective metal–organic frameworks: current status and perspectives

Photocatalytic removal of Cr(Ⅵ) and efficient degradation of tetracycline by oxygen-enriched vacancy pie-like NH2-MIL-125(Ti)

Contact Info

Product

Resources

About

Function of Defects in NH₂-MIL-125@PANI@Co₃O₄ Photocatalyst for Efficient Hydrogen Evolution

Function of Defects in NH₂-MIL-125@PANI@Co₃O₄ Photocatalyst for Efficient Hydrogen Evolution