Hierarchically Porous Single Nanocrystals of Bimetallic Metal–Organic Framework for Nanoreactors with Enhanced Conversion

Teng, Jie; Chen, Minqi; Xie, Yanyu; Wang, Dawei; Jiang, Ji‐Jun; Wang, Haiping; Ye, Fan; Wei, Zhang‐Wen; Su, Cheng‐Yong

doi:10.1021/acs.chemmater.8b02884

Cited by 26 publications

(33 citation statements)

References 71 publications

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“…In addition to bimetallic alloy NPs, the introduced coreshell MNPs in MOF matrix can also improve the catalytic performance of the MNPs@MOFs catalysts, due to the subtle electronic interplay and unique lattice effects in bimetallic core@shell nanostructures. [103,104] In 2015, Jiang et al for the first time, constructed bimetallic Pd@Co core-shell NPs (≈2.5 nm) inside the MIL-101(Cr) matrix (Pd@Co@ MIL-101(Cr)) by preincorporated with Pd 2+ and Co 2+ precursors, and subsequently in situ reduced by a suitable reducing agent. [105] Based on different reduction potentials of the two soluble metal salts, as presented in Figure 7a, when a stronger reduction agent (NaBH 4 ) was used to replace NH 3 BH 3 , PdCo alloy NPs with ≈2.5 nm were formed within MIL-101(Cr), named PdCo@MIL-101(Cr).…”

Section: Bimetallic Nanoparticlesmentioning

confidence: 99%

Incorporation of Active Metal Species in Crystalline Porous Materials for Highly Efficient Synergetic Catalysis

Cui

2020

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or one catalyst with two or more active sites in one reaction system has recently attracted a widespread attention. [1][2][3][4][5][6] Of the many types of catalysis involving this strategy, synergistic catalysis has emerged as a powerful approach, in which the substrates concurrently activated by two or more distinct active sites. [1] This catalytic pathway simultaneously creates more than one reactive species, thereby the reaction energy barriers are distinctly lowered. [7] On the other hand, if selected judiciously, these active sites can collaborate with each other to enable many chemical reactions that are impossible or inefficient for traditional monoactive site catalysts. [4] Therefore, the development of highly efficiently synergetic catalysts with synergistic catalytic sites is of much interest as a way to improve the catalytic performance of heterogeneous catalyst.Loading of active metal species, such as isolated metal sites, metal nanoparticles (MNPs), or clusters, on solid carriers, is one of the most classical methodologies for synthesizing solid catalysts. The resulting materials, so-called supported catalysts, represent a simple and classical type of heterogeneous catalysts, which have been widely investigated and applied to many reactions in the past few decades. Undoubtedly, this type of catalyst is the first and one of most important candidates for designing and fabricating the synergetic catalysts. The problem, however, is that the active metal species dispersed on supports are easily leached and sintered at high temperatures, accompanied by the surface area loss and coke formation. [8][9][10][11][12] Regeneration of these deactivated supported catalysts is expensive and complex, particularly for the noble metal NPs catalysts. To deal with this issue, researchers have developed several strategies, such as strengthen metal-support interactions, coated the active NPs with thin shells of carbon or porous oxides, to stabilize catalytically active species on various supports. However, for the most of typical supports, such as carbon and oxides, the pore structures are poorly controlled, and considerable quantity of active metal sites are embedded in the bulk phase and unable to participate in reactions. In this context, crystalline porous materials (CPMs), mainly including metal-organic frameworks (MOFs) and zeolites, with high surface areas, tunable structures, uniform and well-defined pores/cavities, and feasible designability, have been proven to be a class of ideal supports to hinder sintering and provide access, through confining the active metal species in their nanopores. [8,[13][14][15][16][17][18][19][20][21][22][23][24] The design and development of efficient catalytic materials with synergistic catalytic sites always has long been known to be a thrilling and very dynamic research field. Crystalline porous materials (CPMs) mainly including metalorganic frameworks and zeolites with high scientific and industrial impact have recently been the subject of extensive research due to their essent...

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Section: Bimetallic Nanoparticlesmentioning

confidence: 99%

Incorporation of Active Metal Species in Crystalline Porous Materials for Highly Efficient Synergetic Catalysis

Cui

2020

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“…Bimetallic MOFs are attractive owing to the advantages of widely tunable reactive surface/interface chemistry/composition along with external nano/microstructure in different dimensionality, which in turn can offer extensive surface adsorption, binding, catalytic site density, and electron/mass transport. For instance, rationally designed bimetallic MOFs have resulted in enhanced structural stability and OER performance compared with the monometallic MOFs [13, 17, 20, 26–28] . A highly improved hydrolytic stability and heterogeneous catalytic activity is reported for Zn/Co‐ZIF‐8 compared with ZIF‐8 and ZIF‐67 [20, 28] .…”

Section: Introductionmentioning

confidence: 99%

“…For instance, rationally designed bimetallic MOFs have resulted in enhanced structural stability and OER performance compared with the monometallic MOFs [13, 17, 20, 26–28] . A highly improved hydrolytic stability and heterogeneous catalytic activity is reported for Zn/Co‐ZIF‐8 compared with ZIF‐8 and ZIF‐67 [20, 28] . In addition to this, bimetallic layered double hydroxide based nanowire arrays with ZIF‐67 flower‐like structures and cobalt oxides/hydroxides are also designed to extract better OER activity with respect to ZIF‐67 [10, 11, 29] .…”

Section: Introductionmentioning

confidence: 99%

“…In principle, MOFs with open framework structure composed of metal nodes and ligand heterofunctional groups are ideal candidates for electrocatalytic reactions, which proceed through adsorption/conversion of gaseous/liquid phase reactants and products at a triple phase boundary of solid–liquid–gas interface involving catalyst–electrolyte–oxygen [4, 20–25] . MOFs can offer favorable adsorption/catalytic activities with the intrinsically rich surface functional groups, adsorption/catalytic sites, accessible pore channels as well as high specific surface area and topological structure.…”

Section: Introductionmentioning

confidence: 99%

“…MOFs can offer favorable adsorption/catalytic activities with the intrinsically rich surface functional groups, adsorption/catalytic sites, accessible pore channels as well as high specific surface area and topological structure. Moreover, MOFs can be readily functionalized with metal ions to produce mixed‐metal MOFs [13, 17, 20, 26] . Bimetallic MOFs are attractive owing to the advantages of widely tunable reactive surface/interface chemistry/composition along with external nano/microstructure in different dimensionality, which in turn can offer extensive surface adsorption, binding, catalytic site density, and electron/mass transport.…”

Section: Introductionmentioning

confidence: 99%

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Synthesis and Optimization of Zeolitic Imidazolate Frameworks for the Oxygen Evolution Reaction

Gadipelli

2020

Chemistry A European J

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Metal–organic frameworks/zeolitic imidazolate frameworks (MOFs/ZIFs) and their post‐synthesis modified nanostructures, such as oxides, hydroxides, and carbons have generated significant interest for electrocatalytic reactions. In this work, a high and durable oxygen evolution reaction (OER) performance directly from bimetallic Zn100−xCox‐ZIF samples is reported, without carrying out high‐temperature calcination and/or carbonization. ZIFs can be reproducibly and readily synthesized in large scale at ambient conditions. The bimetallic ZIFs show a systematic and gradually improved OER activity with increasing cobalt concentration. A further increase in OER activity is evidenced in ZIF‐67 polyhedrons with controlled particle size of <200 nm among samples of different sizes between 50 nm and 2 μm. Building on this, a significantly enhanced, >50 %, OER activity is obtained with ZIF‐67/carbon black, which shows a low overpotential of approximately 320 mV in 1.0 m KOH electrolyte. Such activity is comparable to or better than numerous MOF/ZIF‐derived electrocatalysts. The optimized ZIF‐67 sample also exhibits increased activity and durability over 24 h, which is attributed to an in situ developed active cobalt oxide/oxyhydroxide related nanophase.

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Pristine Hollow Metal–Organic Frameworks: Design, Synthesis and Application

et al. 2021

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Hierarchically Porous Single Nanocrystals of Bimetallic Metal–Organic Framework for Nanoreactors with Enhanced Conversion

Cited by 26 publications

References 71 publications

Incorporation of Active Metal Species in Crystalline Porous Materials for Highly Efficient Synergetic Catalysis

Incorporation of Active Metal Species in Crystalline Porous Materials for Highly Efficient Synergetic Catalysis

Synthesis and Optimization of Zeolitic Imidazolate Frameworks for the Oxygen Evolution Reaction

Pristine Hollow Metal–Organic Frameworks: Design, Synthesis and Application

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