A Hydrogen‐Bonded Organic‐Framework‐Derived Mesoporous N‐Doped Carbon for Efficient Electroreduction of Oxygen

Ji, Liu; Li, Ligui; Niu, Wenhan; Wang, Nan; Zhao, Dengke; Zeng, Shuaibo; Chen, Shaowei

doi:10.1002/celc.201600178

Cited by 30 publications

(12 citation statements)

References 49 publications

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“…HOFs have been successfully used in various applications,i ncluding separation, [14b, 15] ion conduction, [16] sensor [17] and catalysis. [18] While HOFs are less stable than other porous materials,the building blocks of which are linked by strong covalent or coordination bonds,t he framework of HOFs is more flexible and thus adjustable to the external environment, such as the desorption of guest molecules and the fluctuation of organic node molecules.…”

Section: Introductionmentioning

confidence: 99%

Jumping Crystal of a Hydrogen‐Bonded Organic Framework Induced by the Collective Molecular Motion of a Twisted π System

2019

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There is alimited number of reports on mechanically responsive molecular crystals,i ncluding thermo-responsive and light-responsive crystals.Rigid ordered molecular crystals with aclose-packing structure are less able to accept distortion, which hampers the development of such molecular crystals. The thermosalient effect, or "crystal jumping", refers to athermo-responsive system that converts heat into mechanical force by thermally induced phase transition. While they have recently attracted attention as potential highly efficient molecular actuators,less than two dozens of thermosalient molecular crystals have been reported to date,a nd the design of such molecules as well as how they assemble to express at hermosalient effect are unknown. Herein, we demonstrate how the cooperative molecular motion of twisted p units could serve to develop at hermo-responsive jumping molecular crystal with ah ydrogen-bonded organic framework (HOF) of tetra-[2,3]thienylene tetracarboxylic acid (1). The cooperative change in the molecular structure triggered by the desolvation of THF in the channel of the HOF structure induced not only ac hangei nt he structure of HOF but also mechanical force. Hydrogen bonding interactions contributed significant thermal stability to maintain the HOF assembly even with ad ynamic structural change.

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Section: Introductionmentioning

confidence: 99%

Jumping Crystal of a Hydrogen‐Bonded Organic Framework Induced by the Collective Molecular Motion of a Twisted π System

2019

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“…Secondly,t he tolerance against methanol crossover is another important ChemCatChem 2017ChemCatChem , 9,2980ChemCatChem -2987 www.chemcatchem.org 2017 Wiley-VCH Verlag GmbH &Co. KGaA, Weinheim concern to evaluate the durability. [62] For the commercial Pt/C electrode (red curve), the addition of 1 m methanoli nto the electrolyte solution caused as udden decreaseo fthev oltammetric current, whichc an be attributed to methanol oxidation on the surface of the electrode (Figure 6b). Notably,i tt ook approximately 400 st or ecover the value to that before the addition of methanol, however,f or Au 33 Pd 67 ,l ittle decrease of the current is observed, which suggestsam uch better methanol tolerance.…”

Section: Resultsmentioning

confidence: 94%

“…This indicates that the long‐term stability of Au 33 Pd 67 is greater than that of Pt/C under the same conditions. Secondly, the tolerance against methanol crossover is another important concern to evaluate the durability . For the commercial Pt/C electrode (red curve), the addition of 1 m methanol into the electrolyte solution caused a sudden decrease of the voltammetric current, which can be attributed to methanol oxidation on the surface of the electrode (Figure b).…”

Section: Resultsmentioning

confidence: 99%

Peptide‐FlgA3‐Based Gold Palladium Bimetallic Nanoparticles That Catalyze the Oxygen Reduction Reaction in Alkaline Solution

Tang

Chen

et al. 2017

ChemCatChem

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Given the synergetic properties of different metal species, bimetallic nanoparticles are of immense scientific interest and technological importance in the field of catalysis. A peptide‐based method represents a new avenue to fabricate bimetallic nanocatalysts with a controllable size, shape, composition, and subtle surface microstructure. However, the electrocatalytic abilities of these peptide‐based bimetallic nanoparticles remain largely unexplored. Herein, we employed the peptide sequence FlgA3 to fabricate a series of AuPd alloys that were used as catalysts for the oxygen reduction reaction (ORR). Among the samples tested, Au33Pd67 exhibited the best activity, evidenced by the most positive onset potential and the largest diffusion‐limited current. Notably, the ORR activity of Au33Pd67 was comparable with that of commercial Pt/C, and the long‐term durability was significantly superior to that of Pt/C. A peptide‐enabled approach might pave the way for the fabrication of bimetallic nanomaterials with enhanced electrocatalytic properties under mild conditions.

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“…On the other hand, the enhanced capacitance also can be contributed to the N functionalization, that could enhance the electrical conductivity and electrolyte solution wettability of the carbon materials. Owing to the hollow mesoporous structure and N functionality, these NMC nanospheres manifest excellent supercapacitor performance as the electrodes with high capacitance up to 240 F g −1 , favorable capacitance retention (97.0% after 5,000 cycles) and high energy density of 11.1 Wh kg −1 (Liu J. et al, 2016).…”

Section: Energy Storage Materialsmentioning

confidence: 99%

N-Doped Mesoporous Carbons: From Synthesis to Applications as Metal-Free Reduction Catalysts and Energy Storage Materials

Yang

Guo

et al. 2019

Front. Chem.

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N-doped mesoporous carbons, NMCs, have attracted intensive attention recently and have shown potential applications in various scientific fields including catalysis and energy conversion/storage. Via modification with foreign N elements and construction of mesoporous structures for NMCs, their electronic and spin structure, as well as their porosity can be greatly tailored. And the resultant electron-donor property, surface wettability, conductivity, ion/molecular transfer and reactivity are changed accordingly. In this review, we will summarize the recent research progress of these metal-free NMCs, with an emphasis on their synthesis and performance, especially for their synthetic strategy and catalytic properties toward oxygen and nitro compound reductions, as well as their electrochemical properties as electrode materials for lithium-ion/sulfur batteries and supercapacitors. We hope for future developments, such as controlling doping methods more precisely, generating more active sites by N-doping, and finding wider applications of NMCs in other fields.

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A Hydrogen‐Bonded Organic‐Framework‐Derived Mesoporous N‐Doped Carbon for Efficient Electroreduction of Oxygen

Abstract: Supporting Information for this article can be foundu nder http:// dx.

Cited by 30 publications

References 49 publications

Jumping Crystal of a Hydrogen‐Bonded Organic Framework Induced by the Collective Molecular Motion of a Twisted π System

Jumping Crystal of a Hydrogen‐Bonded Organic Framework Induced by the Collective Molecular Motion of a Twisted π System

Peptide‐FlgA3‐Based Gold Palladium Bimetallic Nanoparticles That Catalyze the Oxygen Reduction Reaction in Alkaline Solution

N-Doped Mesoporous Carbons: From Synthesis to Applications as Metal-Free Reduction Catalysts and Energy Storage Materials

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