MOF-on-MOF nanoarchitectures for selectively functionalized nitrogen-doped carbon-graphitic carbon/carbon nanotubes heterostructure with high capacitive deionization performance

Zhang, Ying; Wu, Jingyu; Zhang, Shuaihua; Shang, Ningzhao; Zhao, Xiaoxian; Alshehri, Saad M.; Ahamad, Tanir; Yamauchi, Yusuke; Xu, Xingtao; Bandô, Yoshio

doi:10.1016/j.nanoen.2022.107146

Cited by 135 publications

(68 citation statements)

References 46 publications

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Porous nanomaterials are one of the most attractive classes of materials for the investigation of applications in energy storage, water treatment, adsorption/separation, and catalysis. [1][2][3][4][5] A variety of processing/ synthetic methods have been developed to extend the class of porous nanomaterials by establishing morphology and structure control. [6][7][8][9] Of these methods, electrospun carbonaceous nanofibers (ECNFs) are an important subfamily of nanostructured carbons having several advantageous properties, including good mechanical flexibility, controllable morphology, high yield ratio, and environmental friendliness, [10][11][12] leading to their investigation in recent years as electrode materials for flexible supercapacitors.

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confidence: 99%

Embedding Metal–Organic Frameworks for the Design of Flexible Hybrid Supercapacitors by Electrospinning: Synthesis of Highly Graphitized Carbon Nanofibers Containing Metal Oxide Nanoparticles

Zhu²,

et al. 2022

Small Structures

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Electrospun carbonaceous fibers have emerged as promising electrode materials for application in energy storage devices. However, their relatively poor electrical conductivity (due to their amorphous carbon structures) and low capacitive performance lead to poor prospects for their further application. Herein, a universal synthesis of highly graphitized carbon nanofibers, containing various metal oxide nanoparticles (e.g., Fe2O3, NiO), by the pyrolysis of metal–organic framework (MOF)‐embedded electrospun nanofibers, is reported. The resulting carbon nanofibers exhibit large mesopore volumes, contain large quantities of Faradic metal oxide nanoparticles, and are highly graphitized. The fibers also have excellent mechanical flexibility, provide fast ion transfer characteristics, and a large pseudocapacitance combined with excellent electrical conductivity, leading to large specific capacitances. Consequently, asymmetric flexible hybrid supercapacitors assembled from Fe2O3‐embedded highly graphitized carbon nanofibers (FOCNF) and NiO‐embedded highly graphitized carbon nanofibers (NOCNF) exhibit a high energy density of 43.1 Wh kg−1 at a power density of 412.5 W kg−1 and possess excellent flexibility (capacitance retention of 94.4% at 180° bending and 96.2% at 30° twisting) with superior cycling stability. This strategy provides a new MOF‐based approach for the design and synthesis of multifunctional flexible carbonaceous materials and might lead to their further application in flexible energy storage devices.

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confidence: 99%

Embedding Metal–Organic Frameworks for the Design of Flexible Hybrid Supercapacitors by Electrospinning: Synthesis of Highly Graphitized Carbon Nanofibers Containing Metal Oxide Nanoparticles

Zhu²,

et al. 2022

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“…1,28 Compared with NiMOF 180, the NiMOF/CNTs showed peaks at 25.9°corresponding to the (002) plane existing in the highly graphitic carbon atoms of the CNTs. 29 However, some slight changes in the weak peaks differentiated NiMOF/CNTs 180 from the others; in particular, the peaks near 22.1°and 38.1°vanished, which could be due to the inexistence of impurities and metal oxides. 30 To further investigate the internal microstructure of the NiMOF/CNTs 180, TEM was performed.…”

Section: Morphology and Structure Characterizationmentioning

confidence: 96%

CNTs support 2D NiMOF nanosheets for asymmetric supercapacitors with high energy density

Liao

Liu

et al. 2022

Dalton Trans.

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“…To address this problem, researchers have attempted to increase the number of active sites in catalysts and improve catalytic efficiency. , Because an electrochemical reaction usually occurs on the surface of an electrocatalyst or interface between the catalysts and other components, its geometric structure, electronic state, and structural defects significantly influence its electrocatalytic performance. − Consequently, by adjusting the morphology and electronic distribution of TMSs, the number of their active sites and OER activity can be significantly increased. , Regarding geometry optimization, hierarchical nanostructures with excellent specific surface areas and macroporosities that generate abundant active surface sites have been constructed. Currently, metal–organic framework (MOF)-derived methods using designed carbon matrix composites are employed in practice. − The periodic arrangement of different atoms in MOF crystals provides uniform distribution of atoms after further modification. Crystalline MOFs with hollow-core construction are chosen as metal and carbon sources.…”

Section: Introductionmentioning

confidence: 99%

Cobalt Sulfide Nanoparticles Encapsulated in Carbon Nanotube-Grafted Carbon Nanofibers as Catalysts for Oxygen Evolution

Guo

Chang

et al. 2022

ACS Appl. Nano Mater.

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Designing multiple composite materials with hierarchical structures is an effective approach for enhancing the electrochemical properties of electrocatalysts owing to the synergistic effects and structural advantages of the components of materials. Herein, we report highly active electrocatalysts comprising CoS2 nanoparticles embedded in carbon nanotube (CNT)-grafted carbon nanofibers (CNF/CoS2–CNT) for the oxygen evolution reaction (OER). Catalysts with different sulfuration levels were synthesized by pyrolyzing ZIF-67 in a reducing hydrogen atmosphere, followed by an adjustable sulfuration process. The main advantages of the obtained hierarchical structure are as follows: first, the catalyst is embedded in CNTs in situ, achieving efficient electron transport; then, the CNT coating inhibits catalyst agglomeration during OER; finally, CNFs with a three-dimensional cross-linked nonwoven fabric structure can effectively anchor CNTs, avoiding agglomeration. The optimized CNF/CoS2–CNT catalyst exhibits a high electrolyte-accessible surface area, abundant mass diffusion pathways, and high structural integrity. It achieves a current density of 50 mA cm–2 at a low overpotential of 0.35 V for OER in a 1 M potassium hydroxide (KOH) solution. Remarkably, this catalyst also exhibits excellent stability in an electrochemical test containing a KOH solution. The findings indicate that CNF/CoS2–CNT catalysts with hierarchical structures could be potential electrode materials in advanced energy conversion devices.

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MOF-on-MOF nanoarchitectures for selectively functionalized nitrogen-doped carbon-graphitic carbon/carbon nanotubes heterostructure with high capacitive deionization performance

Cited by 135 publications

References 46 publications

Embedding Metal–Organic Frameworks for the Design of Flexible Hybrid Supercapacitors by Electrospinning: Synthesis of Highly Graphitized Carbon Nanofibers Containing Metal Oxide Nanoparticles

Embedding Metal–Organic Frameworks for the Design of Flexible Hybrid Supercapacitors by Electrospinning: Synthesis of Highly Graphitized Carbon Nanofibers Containing Metal Oxide Nanoparticles

CNTs support 2D NiMOF nanosheets for asymmetric supercapacitors with high energy density

Cobalt Sulfide Nanoparticles Encapsulated in Carbon Nanotube-Grafted Carbon Nanofibers as Catalysts for Oxygen Evolution

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