scholarly journals Nanosized Monometallic Selenides Heterostructures Implanted into Metal Organic Frameworks-Derived Carbon for Efficient Lithium Storage

2021 ◽  
Author(s):  
Zhichao Liu ◽  
Dong Wang ◽  
Hongliang Mu ◽  
Chunjie Zhang ◽  
Liqing Wu ◽  
...  
Keyword(s):  
Active Sites ◽  
Electrode Materials ◽  
Metal Organic Frameworks ◽  
Rate Capability ◽  
Ex Situ ◽  
Lithium Storage ◽  
Two Phase ◽  
Related Field ◽  
Transfer Resistance ◽  
Metal Organic

Abstract Two-phase heterostructure with rich phase boundaries holds great potential in engineering advanced electrode materials. However, current heterostructures are largely generated by introducing exotic cations or anions, complicating synthetic procedures and disturbing real insights into the intrinsic effect of heterostructure. Herein, nanosized monometallic selenides heterostructures are developed by precisely controlled selenylation of metal organic frameworks, which are implanted into in-situ formed carbon (NiSe/NiSe2@C, CoSe/CoSe2@C). The disordered atoms arrangement at two-phase boundary leads to the redistribution of interfacial charge and generation of lattice distortions, promoting easy adsorption and swift transfer of Li+, and providing extra active sites. As a proof of concept, the NiSe/NiSe2@C exhibits far surpassing lithium storage properties to single-phase counterparts (NiSe@C and NiSe2@C), including higher reversible capacity of 1015.5 mAh g− 1, better rate capability (500.8 mAh g− 1 at 4 A g− 1), and superior cyclic performance. As expected, the NiSe/NiSe2@C manifests lower charge transfer resistance, higher Li+ diffusion coefficient, and accelerated capacitive kinetics. Ex-situ X-ray diffraction, high-resolution transmission electron microscopy, and selected area electron diffraction combined with differential capacity versus voltage plots reveal multi-step redox mechanism of NiSe/NiSe2@C and the reason of conspicuous capacity enhancement. This work demonstrates the enormous potential of monometallic monoanionic heterostructure in energy-related field.

Highly Conductive Two-Dimensional Metal–Organic Frameworks for Resilient Lithium Storage with Superb Rate Capability

ACS Nano ◽  
2020 ◽  
Vol 14 (9) ◽  
pp. 12016-12026 ◽  
Author(s):  
Zhenzhen Wu ◽  
David Adekoya ◽  
Xing Huang ◽  
Milton J. Kiefel ◽  
Jian Xie ◽  
...  
Keyword(s):  
Metal Organic Frameworks ◽  
Rate Capability ◽  
Two Dimensional ◽  
Lithium Storage ◽  
Metal Organic

Facile Synthesis of Polypyrrole Nanofibers/Co-MOF Composite and Its Lithium Storage Properties

2020 ◽  
Vol 12 (4) ◽  
pp. 486-491
Author(s):  
Jinlei Wang ◽  
Na Cao ◽  
Huiling Du ◽  
Xian Du ◽  
Hai Lu ◽  
...  
Keyword(s):  
Electrode Materials ◽  
Rate Capability ◽  
Lithium Ion ◽  
Reversible Capacity ◽  
Cycling Performance ◽  
Charge Transfer Resistance ◽  
Growth Strategy ◽  
Composite Electrodes ◽  
Lithium Storage ◽  
Transfer Resistance

Metal-organic frameworks (MOFs) have recently emerged as promising electrode materials for lithium-ion batteries (LIBs). However, poor electrical conductivity in most MOFs limits their electrochemical performance. In this work, the integration of flaky cobalt 1,4-benzenedicarboxylate (Co-BDC) MOF with conductive polypyrrole (PPy) nanofibers via in-situ growth strategy was explored for developing novel anode materials for LIBs. Electrochemical studies showed that PPy/Co-BDC composites exhibited enhanced cycling performance (a reversible capacity of ca. 364 mA h g–1 at a current density of 50 mA g–1 after 100 cycles) and rate capability, com- pared with the pristine Co-BDC. The well dispersion of Co-BDC on polypyrrole nanofibers and the decrease in charge-transfer resistance of the composite electrodes accounted for the improvement of electrochemical properties.

scholarly journals Rational Incorporation of Missing Linker Defects Within Metal-Organic Frameworks Generates Highly Active Electrocatalytic Sites

2020 ◽  
Author(s):  
Nina Heidary ◽  
Daniel Chartrand ◽  
Nikolay Kornienko
Keyword(s):  
Active Sites ◽  
A Priori ◽  
Metal Organic Frameworks ◽  
Ex Situ ◽  
Redox Potentials ◽  
Faradaic Efficiency ◽  
Binding Motifs ◽  
Highly Active ◽  
Catalytically Active ◽  
Metal Organic

The allure of metal-organic frameworks (MOFs) in heterogeneous electrocatalysis is that catalytically active sites may be designed a priori with an unparalleled degree of control. An emerging strategy to generate coordinatively-unsaturated active sites is through the use of organic linkers that lack a functional group that would usually bind with the metal node. To execute this strategy, we synthesize a model MOF, Ni-MOF-74 and incorporate a fraction of 2-hydroxyterephthalic acid in place of 2,5-dihydroxyterephthalic acid. The defective MOF, Ni74D, is evaluated vs. the nominally defect-free Ni74 MOF with a host of ex situ and in situ spectroscopic and electroanalytical techniques, using the oxidation of hydroxymethylfurtural (HMF) as a model reaction. The data indicates that Ni74D features a set of 4-coordinate Ni-O4 sites that exhibit unique vibrational signatures, redox potentials, binding motifs to HMF, and consequently superior electrocatalytic activity relative to the original Ni74 MOF, being able to convert HMF to the desired 2,5- furandicarboxylic acid at 95% yield and 80% Faradaic efficiency. The strategy put forth to rationally design coordinatively-unsaturated electrocatalytic sites and the methodology put forth in investigating their behavior stand to bolster the understanding and growth of the field.

scholarly journals Rational Incorporation of Missing Linker Defects Within Metal-Organic Frameworks Generates Highly Active Electrocatalytic Sites

2020 ◽  
Author(s):  
Nina Heidary ◽  
Daniel Chartrand ◽  
Nikolay Kornienko
Keyword(s):  
Active Sites ◽  
A Priori ◽  
Metal Organic Frameworks ◽  
Ex Situ ◽  
Redox Potentials ◽  
Faradaic Efficiency ◽  
Binding Motifs ◽  
Highly Active ◽  
Catalytically Active ◽  
Metal Organic

The allure of metal-organic frameworks (MOFs) in heterogeneous electrocatalysis is that catalytically active sites may be designed a priori with an unparalleled degree of control. An emerging strategy to generate coordinatively-unsaturated active sites is through the use of organic linkers that lack a functional group that would usually bind with the metal node. To execute this strategy, we synthesize a model MOF, Ni-MOF-74 and incorporate a fraction of 2-hydroxyterephthalic acid in place of 2,5-dihydroxyterephthalic acid. The defective MOF, Ni74D, is evaluated vs. the nominally defect-free Ni74 MOF with a host of ex situ and in situ spectroscopic and electroanalytical techniques, using the oxidation of hydroxymethylfurtural (HMF) as a model reaction. The data indicates that Ni74D features a set of 4-coordinate Ni-O4 sites that exhibit unique vibrational signatures, redox potentials, binding motifs to HMF, and consequently superior electrocatalytic activity relative to the original Ni74 MOF, being able to convert HMF to the desired 2,5- furandicarboxylic acid at 95% yield and 80% Faradaic efficiency. The strategy put forth to rationally design coordinatively-unsaturated electrocatalytic sites and the methodology put forth in investigating their behavior stand to bolster the understanding and growth of the field.

Facile synthesis and characterization of the Mn-MOF electrode material for flexible supercapacitors

2021 ◽  
pp. 1-19
Author(s):  
Yanhong Liu ◽  
Jiahong Liu ◽  
Yijun Cao ◽  
Wei Shang ◽  
Ning Peng ◽  
...  
Keyword(s):  
Current Density ◽  
Electrode Material ◽  
High Performance ◽  
Electrode Materials ◽  
Metal Organic Frameworks ◽  
Charge Transfer Resistance ◽  
Carbon Cloth ◽  
Flexible Electrode ◽  
Transfer Resistance ◽  
Metal Organic

Abstract Metal-organic frameworks (MOFs) due to their porosity and well-defined structures are considered to be very promising electrode materials for the construction of high-performance supercapacitor. In this paper, manganese-based metal organic frameworks (Mn-MOF) were prepared on the surface of carbon cloth (CC) by hydrothermal method. The morphology and structure of the electrode material were characterized by SEM, XRD, FT-IR, and XPS. Its electrochemical studies show that the Mn-MOF electrode materials exhibit low charge transfer resistance, the excellent specific capacitance of 433.5 mF·cm−2 in 1.0 M Na2SO4 aqueous solution at the current density of 0.8 mA·cm−2. It is noteworthy that the flexible electrode has excellent cycle stability and 105% capacitance retention even after 5000 cycles at a current density of 5 mA·cm−2. The high electrochemical performance of Mn-MOF/CC flexible electrode materials can be attributed to its three-dimensional porous structure.

Construction of NiCo2O4@graphene nanorods by tuning the compositional chemistry of metal–organic frameworks with enhanced lithium storage properties

2018 ◽  
Vol 6 (40) ◽  
pp. 19604-19610 ◽  
Author(s):  
Zhiqing Jia ◽  
Yingbin Tan ◽  
Zhonghui Cui ◽  
Linlin Zhang ◽  
Xiangxin Guo
Keyword(s):  
Storage Capacity ◽  
Metal Organic Frameworks ◽  
Rate Capability ◽  
Cycling Stability ◽  
Lithium Storage ◽  
Metal Organic ◽  
Storage Properties ◽  
Li Storage

NiCo2O4@graphene nanorods synthesized by tuning the compositional chemistry of metal–organic frameworks exhibit high Li-storage capacity, excellent rate capability and extraordinary cycling stability.

Encapsulating ionic liquids into POM-based MOFs to improve their conductivity for superior lithium storage

2018 ◽  
Vol 6 (18) ◽  
pp. 8735-8741 ◽  
Author(s):  
Mi Zhang ◽  
A-Man Zhang ◽  
Xiao-Xiao Wang ◽  
Qing Huang ◽  
Xiaoshu Zhu ◽  
...  
Keyword(s):  
Ionic Liquids ◽  
Anode Materials ◽  
Metal Organic Frameworks ◽  
Rate Capability ◽  
Reversible Capacity ◽  
Cycling Stability ◽  
Lithium Storage ◽  
High Reversible Capacity ◽  
Metal Organic ◽  
Superior Cycling Stability

We encapsulate ionic liquids (ILs) into polyoxometalate-based metal–organic frameworks (POMOFs) to fabricate a series of ILs-functionalized POMOFs crystals (POMs-ILs@MOFs) and PMo10V2-ILs@MIL-100 crystals used as anode materials show high reversible capacity, superior cycling stability and rate capability.

Metal-organic-framework derived hollow manganese nickel selenide spheres confined with nanosheets on nickel foam for hybrid supercapacitors

2021 ◽  
Author(s):  
Bahareh ameri ◽  
Akbar Mohammadi Zardkhoshoui ◽  
Saied Saeed Hosseiny Davarani
Keyword(s):  
Active Sites ◽  
Nickel Foam ◽  
Metal Organic Framework ◽  
High Surface ◽  
Metal Organic Frameworks ◽  
High Surface Area ◽  
Supercapacitive Performance ◽  
Hybrid Supercapacitors ◽  
Porous Networks ◽  
Metal Organic

Metal-organic frameworks (MOFs) derived nanoarchitectures have special features, such as high surface area (SA), abundant active sites, exclusive porous networks, and remarkable supercapacitive performance when compared to traditional nanoarchitectures. Herein,...

A small molecular, a big scissoring effect: sodium dodecyl sulfate working on two-dimensional metal organic frameworks

CrystEngComm ◽  
2021 ◽  
Author(s):  
Qing Luo ◽  
Zhen Ding ◽  
Huamin Sun ◽  
Zhen Cheng ◽  
Naien SHI ◽  
...  
Keyword(s):  
Sodium Dodecyl Sulfate ◽  
Active Sites ◽  
Metal Organic Framework ◽  
Metal Organic Frameworks ◽  
Sodium Dodecyl ◽  
Advanced Materials ◽  
Controlled Synthesis ◽  
Two Dimensional ◽  
Dodecyl Sulfate ◽  
Metal Organic

Ultrathin two-dimensional (2D) metal-organic framework (MOF) nanosheets are prosperous advanced materials due to their particularly thin thickness and exposed active sites. The difficulty in the controlled synthesis of 2D MOF...

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