Large‐Scale, Bottom‐Up Synthesis of Binary Metal–Organic Framework Nanosheets for Efficient Water Oxidation

Li, Feilong; Wang, Pengtang; Huang, Bolong; Young, David J.; Wang, Hui‐Fang; Braunstein, Pierre; Lang, Jian‐Ping

doi:10.1002/ange.201902588

Cited by 120 publications

(68 citation statements)

References 35 publications

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“…For instance, it was reported that 2D MOF nanosheets could expose more active surface sites than bulk MOFs . Conductive MOFs and nanoscale MOFs were found possessing faster electronic transport capability . Additionally, multimetallic MOFs exhibit an enhancement of catalytic activity in virtue of synergistic effect .…”

Section: Introductionmentioning

confidence: 99%

Engineering Bimetal Synergistic Electrocatalysts Based on Metal–Organic Frameworks for Efficient Oxygen Evolution

Liu

Kong

Wang

et al. 2019

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Benefiting from metal–organic frameworks (MOFs) unique structural characteristics, their versatility in composition and structure has been well explored in electrochemical oxygen evolution reaction (OER) processes. Here, a ligand/ionic exchange phenomenon of MOFs is reported in alkaline solution due to their poor stability, and the active species and reaction mechanism of MOFs are revealed in the OER process. A series of mixed Ni‐MOFs and Fe‐MOFs are synthesized by straightforward sonication and then directly used as catalyst candidates for OER in alkaline electrolyte. It can be confirmed via ex situ transmission electron microscopic images and X‐ray diffraction patterns analysis, that the bimetallic hydroxide (NiFe‐LDH) is generated in 1.0 m KOH in situ and acts as protagonist for oxygen evolution. The optimized catalyst (FN‐2) exhibits a lower overpotential (275 mV at a current density of 10 mA cm−2) and excellent long‐term stability (strong current density for 100 h without fading). The revelation of the real active species of MOF materials may contribute to better understanding of the reaction mechanism.

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Section: Introductionmentioning

confidence: 99%

Engineering Bimetal Synergistic Electrocatalysts Based on Metal–Organic Frameworks for Efficient Oxygen Evolution

Liu

Kong

Wang

et al. 2019

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138

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“…Nanosizing MOFs into ultrathin metal-organic layers (MOLs) can e ciently accelerate mass transport / electron transfer and create abundant readily accessible active sites to ensure high activity in various catalytic reactions. [19][20][21][22][23][24][25][26][27][28][29][30][31][32][33][34] Moreover, ultrathin MOFs with limited number of atoms represent ideal models to explore structure-performance relationships for further rationally constructing e cient catalysts at atomic/molecular levels. For example, a mono-carboxylic bipyridine ligand was utilized to assemble Re-/Mn-Ru molecules into monolayer Hf-based MOLs, 20 the resulting Re-Ru-based MOLs can sustainably reduce CO 2 to CO under real sunlight for one week.…”

Section: Introductionmentioning

confidence: 99%

Facile electron delivery from graphene template to ultrathin metal-organic layers for boosting CO2 photoreduction

Wang¹,

Qiao

Nie³

et al. 2020

Preprint

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Metal-organic layers (MOLs) with ordered structure and molecular tunability are of great potential as heterogeneous catalysts due to their readily accessible active sites. Herein, we demonstrate a facile template strategy to prepare MOLs with a uniform thickness of three metal coordination layers (ca. 1.5 nm) with graphene oxide (GO) as both template and electron mediator. The resulting MOL@GO exhibits an outstanding performance for CO2 photoreduction with a record-high total CO yield of 3133 mmol/gMOL among all the metal-organic framework and MOL catalysts (CO selectivity of 95%). This performance is ca. 34 times higher than that of bulky Co-MOF, [CoL(H2O)2]•0.5H2O (H2L = 5-(1H-1,2,4-triazol-1-yl)isophthalic acid). Systematic studies reveal that well exposed active sites in MOLs, and facile electron transfer between heterogeneous and homogeneous components mediated by GO, greatly contribute to its high activity. This work highlights a facile way for constructing ultrathin MOLs and demonstrate charge transfer pathway between conductive template and catalyst for boosting photocatalysis.

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“…Its crystal phase is the same as the well‐known Ni‐based MOF (nickel aquahydroxy terephthalate, Ni 3 (C 8 H 4 O 4 ) 2 (OH) 2 (H 2 O) 4 , CCDC No. 638 866) . The peaks at 9.3°, 11.9°, 12.3°, 15.6°, 18.3°, 23.8°, and 28.1° correspond to the (100), (010), (−110), (−101), (−210), (020), and (002) lattice planes of 2D MOF‐Co, respectively.…”

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confidence: 98%

Single Atom Array Mimic on Ultrathin MOF Nanosheets Boosts the Safety and Life of Lithium–Sulfur Batteries

et al. 2020

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The development of Li–S batteries is largely impeded by the growth of Li dendrites and polysulfide shuttling. To solve these two problems simultaneously, herein the study reports a “single atom array mimic” on ultrathin metal organic framework (MOF) nanosheet‐based bifunctional separator for achieving the highly safe and long life Li–S batteries. In the designed separator, the periodically arranged cobalt atoms coordinated with oxygen atoms (CoO4 moieties) exposed on the surface of ultrathin MOF nanosheets, “single atom array mimic”, can greatly homogenize Li ion flux through the strong Li ion adsorption with O atoms at the interface between anode and separator, leading to stable Li striping/plating. Meantime, at the cathode side, the Co single atom array mimic serves as “traps” to suppress polysulfide shuttling by Lewis acid‐base interaction. As a result, the Li–S coin cells with the bifunctional separator exhibit a long cycle life with an ultralow capacity decay of 0.07% per cycle over 600 cycles. Even with a high sulfur loading of 7.8 mg cm−2, an areal capacity of 5.0 mAh cm−2 can be remained after 200 cycles. Moreover, the assembled Li–S pouch cell displays stable cycling performance under various bending angles, demonstrating the potential for practical applications.

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Large‐Scale, Bottom‐Up Synthesis of Binary Metal–Organic Framework Nanosheets for Efficient Water Oxidation

Cited by 120 publications

References 35 publications

Engineering Bimetal Synergistic Electrocatalysts Based on Metal–Organic Frameworks for Efficient Oxygen Evolution

Engineering Bimetal Synergistic Electrocatalysts Based on Metal–Organic Frameworks for Efficient Oxygen Evolution

Facile electron delivery from graphene template to ultrathin metal-organic layers for boosting CO2 photoreduction

Single Atom Array Mimic on Ultrathin MOF Nanosheets Boosts the Safety and Life of Lithium–Sulfur Batteries

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