Methyl Trifluoroacetate as a Methylation Reagent for N−H, O−H, and S−H Functionalities under Mild Conditions

Zheng, Xin; Zeng, Jiechun; Xiong, Mindong; Huang, Jiawei; Li, Cuiyan; Zhou, Rujin; Xiao, Duoduo

doi:10.1002/ajoc.201900413

Cited by 14 publications

(11 citation statements)

References 57 publications

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“…However, TMSs often accompany with volume expansion during the charge/discharge process, which can lead to the break in the connection of electrode materials and collectors, reducing their recyclability and safety . The introduction of graphene or graphene derivatives can solve these issues effectively due to their layered structure, higher thermal conductivity and good thermal/chemical stability.…”

Section: Lithium‐ion Batteriesmentioning

confidence: 99%

Transition Metal Sulfides Based on Graphene for Electrochemical Energy Storage

Geng

Zheng

Tang

et al. 2018

Advanced Energy Materials

697

281

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factors: electrode materials, electrolytes, and separators. [18] Finding suitable electrode materials to promote and realize their commercialization is still considered one of the major challenges. [19][20][21] Up to now, electrode materials have commonly included carbon materials (CMs), [5,13,22] conducting polymer materials (CPMs), [23] transition metal oxides (TMOs), [24] and others. [25][26][27] However, they all have their respective shortcomings; for instance, CMs tend to restack and then decrease the specific surface area, which is an important index for CM performance. [28][29][30] CPMs show the same phenomenon that the original structure will collapse under long-term charge/discharge process. [23] Although the above two types of electrode materials have good electron conductivity, their changing specific surface area and structures during use make them unlikely to be promising electrode materials. TMOs always have a good reversible faradic reaction due to their valence flexibility. However, in comparison to CMs, their poor electron conductivity may lower their specific capacity. [31][32][33] Transition metal sulfides (TMSs) have attracted tremendous attention due to their high specific capacity. For example, nickel and cobalt sulfides (e.g., NiS x , CoS x ) have specific capacities that are double of their oxide counterparts (e.g., NiO x , CoO x ). [22,[34][35][36] This is because the replacement of oxygen with sulfur, an element with a lower electronegativity, increases the performance compared to TMOs. [37,38] However, their unyielding volume change during the cycling process has hindered their further development and application in lithium and sodium rechargeable batteries. [39] Though TMSs possess high specific capacities and excellent rate capabilities when used for SCs, it is difficult to achieve all these objectives simultaneously from a single material. Therefore, the hybridization of different materials with different properties is becoming an interesting research area. Recent papers have testified that the adulteration of graphene or graphene derivatives can solve these issues and increase the electrochemical performance of energy storage devices. [40][41][42] It can be attributed to the properties of graphene: 2D conductive networks, a large specific surface area, and good physicochemical stability. In addition to these properties, their porous structure can effectively promote the diffusion of electrolyte ions. Therefore, 2D graphene is one of the ideal support framework materials to prepare TMS@graphene composites for electrode materials. [43][44][45][46] Transition metal sulfides, as an important class of inorganics, can be used as excellent electrode materials for various types of electrochemical energy storage, such as lithium-ion batteries, sodium-ion batteries, supercapacitors, and others. Recent works have identified that mixing graphene or graphene derivatives with transition metal sulfides can result in novel composites with better electrochemical performance. This review summarizes ...

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Section: Lithium‐ion Batteriesmentioning

confidence: 99%

Transition Metal Sulfides Based on Graphene for Electrochemical Energy Storage

Geng

Zheng

Tang

et al. 2018

Advanced Energy Materials

697

281

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“…One is to use MOF as a template to prepare MOF derivatives: metal oxides, metal nanoparticles, porous carbon compounds, etc. [29,30] The other is that pure MOFs are directly applied to electrode materials for SCs and their capacitance are based on the reversible redox Hexagonal nickel-organic framework (Ni-MOF) [Ni(NO 3 ) 2 ·6H 2 O, 1,3,5-benzenetricarboxylic acid, 4-4′-bipyridine] is fabricated through a onestep solvothermal method. The {001} crystal plane is exposed to the largest hexagonal surface, which is an ideal structure for electron transport and ion diffusion.…”

Section: Doi: 101002/smll201902463mentioning

confidence: 99%

Exposing {001} Crystal Plane on Hexagonal Ni‐MOF with Surface‐Grown Cross‐Linked Mesh‐Structures for Electrochemical Energy Storage

Liu

et al. 2019

Small

104

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Hexagonal nickel‐organic framework (Ni‐MOF) [Ni(NO3)2·6H2O, 1,3,5‐benzenetricarboxylic acid, 4‐4′‐bipyridine] is fabricated through a one‐step solvothermal method. The {001} crystal plane is exposed to the largest hexagonal surface, which is an ideal structure for electron transport and ion diffusion. Compared with the surrounding rectangular crystal surface, the ion diffusion length through the {001} crystal plane is the shortest. In addition, the cross‐linked porous mesh structures growing on the {001} crystal plane strengthen the mixing with conductive carbon, inducing preferable conductivity, as well as increasing the area of ion contact and the number of active sites. These advantages enable the hexagonal Ni‐MOF to exhibit excellent electrochemical performance as supercapacitor electrode materials. In a three‐electrode cell, specific capacitance of hexagonal Ni‐MOF in the 3.0 m KOH electrolyte is 977.04 F g−1 and remains at the initial value of 92.34% after 5,000 cycles. When the hexagonal Ni‐MOF and activated carbon are assembled into aqueous devices, the electrochemical performance remains effective.

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“…Furthermore, GO sheets show remarkable improvements in chemical and physical properties when incorporated in composite materials with potential applications in many areas, such as solar cell, resonators, electronic devices, and supercapacitors. [16,17] Covalent organic frameworks (COFs), an emerging class of crystalline porous materials fabricated from purely organic building blocks linked by reversible covalent bonds have attracted much attention due to their highly ordered structure and accessible distinct pores. [18,19] The fascinating features of tunable pore size, perpetual porosity, large surface area, low density, and plentiful functional groups on the channel walls render COFs great potential in an extensive variety of applications, including gas separation, [20] gas storage, [21] chemical sensors, [22] optoelectronics, [23] drug delivery [21] and catalysis.…”

Section: Introductionmentioning

confidence: 99%

Application of GO/COF as a novel, efficient and recoverable catalyst in the Knoevenagel reaction

Monehzadeh

Rafiee

2020

Applied Organom Chemis

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Hybrid composite based on graphene oxide (GO) and covalent organic framework (COF) [GO/COF] was developed via a simple solvothermal method, at which GO was applied as a platform to load COF based on melamine and terephthaldehyde. The synthesized hybrid nanocomposite was characterized by FT‐IR, XRD, EDX and SEM techniques. Morphological analyses carried out by SEM confirm the successful growth of COF over GO. Then, the resultant composite was employed as an amazing and cost‐effective catalyst in the condensation of several aldehydes with malononitrile and produced the corresponding coupling products in high yields (up to 84%) at room temperature under solvent‐free conditions with an amount of catalyst, 15 mg in a very short reaction time of 10 min. The catalyst could be reused without a noteworthy drop in catalytic activity at least eight times. The use of GO/COF catalyst outcomes under mild reaction conditions in very short reaction time, exceptional catalytic activity, high recyclability and an easy work‐up process for the Knoevenagel condensation.

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Methyl Trifluoroacetate as a Methylation Reagent for N−H, O−H, and S−H Functionalities under Mild Conditions

Cited by 14 publications

References 57 publications

Transition Metal Sulfides Based on Graphene for Electrochemical Energy Storage

Transition Metal Sulfides Based on Graphene for Electrochemical Energy Storage

Exposing {001} Crystal Plane on Hexagonal Ni‐MOF with Surface‐Grown Cross‐Linked Mesh‐Structures for Electrochemical Energy Storage

Application of GO/COF as a novel, efficient and recoverable catalyst in the Knoevenagel reaction

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