Synthesis, properties, and applications of carbon nanotubes filled with foreign materials: a review

Poudel, Yuba; Li, Wenzhi

doi:10.1016/j.mtphys.2018.10.002

Cited by 122 publications

(57 citation statements)

References 166 publications

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“…Excellent work has been reported on self-supported LDHs grown in situ on conductive supports toward water splitting [35,36]. In addition to their excellent chargetransfer ability, conventional supports like nickel foam (NF), copper foam (CF), and carbon cloth (CC) can provide a large surface area for active electrocatalysts to grow [10,37]. Generally speaking, the rational growth of self-supported LDHs on substrates can accelerate the OER process based on the following aspects: (1) direct growth of LDH nanoarrays on conductive bones not only immobilizes the LDH's unique lamellar structure on the electrode surface but also promotes electron transport from the LDH to the substrate due to the intimate interfacial connection, (2) the large surface area of this open structure is beneficial to the contact between the electrode and the electrolyte media, which guarantees that the active sites effectively take part in the OER and avoid potential aggregation, and (3) the self-supported LDH nanoarrays with an ordered structure and open space are helpful for the gas-bubble release by providing smooth diffusion paths for gaseous products [34,38,39].…”

Section: Introductionmentioning

confidence: 99%

Recent Advances in Self-Supported Layered Double Hydroxides for Oxygen Evolution Reaction

Luo

Xiao

et al. 2020

Research

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Electrochemical water splitting driven by clean and sustainable energy sources to produce hydrogen is an efficient and environmentally friendly energy conversion technology. Water splitting involves hydrogen evolution reaction (HER) and oxygen evolution reaction (OER), in which OER is the limiting factor and has attracted extensive research interest in the past few years. Conventional noble-metal-based OER electrocatalysts like IrO2 and RuO2 suffer from the limitations of high cost and scarce availability. Developing innovative alternative nonnoble metal electrocatalysts with high catalytic activity and long-term durability to boost the OER process remains a significant challenge. Among all of the candidates for OER catalysis, self-supported layered double hydroxides (LDHs) have emerged as one of the most promising types of electrocatalysts due to their unique layered structures and high electrocatalytic activity. In this review, we summarize the recent progress on self-supported LDHs and highlight their electrochemical catalytic performance. Specifically, synthesis methods, structural and compositional parameters, and influential factors for optimizing OER performance are discussed in detail. Finally, the remaining challenges facing the development of self-supported LDHs are discussed and perspectives on their potential for use in industrial hydrogen production through water splitting are provided to suggest future research directions.

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Section: Introductionmentioning

confidence: 99%

Recent Advances in Self-Supported Layered Double Hydroxides for Oxygen Evolution Reaction

Luo

Xiao

et al. 2020

Research

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“…Carbon nanotubes (CNTs) are an ideal material for filling of their empty cavities with different species. Almost any compound can be encapsulated inside CNT through liquid-phase capillarity and vapour-phase diffusion effects or by in situ filling during CNT growth [1][2][3][4][5]. The quasi-one dimensional structure of CNTs templates the synthesis of metallic nanowires [6][7][8], ordered nanoparticles [9,10] and even ordered atomic chains [10].…”

Section: Introductionmentioning

confidence: 99%

Light-Induced Sulfur Transport inside Single-Walled Carbon Nanotubes

et al. 2020

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Filling of single-walled carbon nanotubes (SWCNTs) and extraction of the encapsulated species from their cavities are perspective treatments for tuning the functional properties of SWCNT-based materials. Here, we have investigated sulfur-modified SWCNTs synthesized by the ampoule method. The morphology and chemical states of carbon and sulfur were analyzed by transmission electron microscopy, Raman scattering, thermogravimetric analysis, X-ray photoelectron and near-edge X-ray absorption fine structure spectroscopies. Successful encapsulation of sulfur inside SWCNTs cavities was demonstrated. The peculiarities of interactions of SWCNTs with encapsulated and external sulfur species were analyzed in details. In particular, the donor–acceptor interaction between encapsulated sulfur and host SWCNT is experimentally demonstrated. The sulfur-filled SWCNTs were continuously irradiated in situ with polychromatic photon beam of high intensity. Comparison of X-ray spectra of the samples before and after the treatment revealed sulfur transport from the interior to the surface of SWCNTs bundles, in particular extraction of sulfur from the SWCNT cavity. These results show that the moderate heating of filled nanotubes could be used to de-encapsulate the guest species tuning the local composition, and hence, the functional properties of SWCNT-based materials.

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“…Carbon nanotubes (CNTs) are intriguing materials with applications ranging from nanotechnology-related devices (i.e., in electronics, energy storage, water treatment, as sensor/biosensor) [1] to drug/probes delivery systems for therapy and diagnosis [2,3].…”

Section: Introductionmentioning

confidence: 99%

Novel Nanohybrids Based on Supramolecular Assemblies of Meso-tetrakis-(4-sulfonatophenyl) Porphyrin J-aggregates and Amine-Functionalized Carbon Nanotubes

et al. 2020

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The ability of multiwalled carbon nanotubes (MWCNTs) covalently functionalized with polyamine chains of different length (ethylenediamine, EDA and tetraethylenepentamine, EPA) to induce the J-aggregation of meso-tetrakis(4-sulfonatophenyl)porphyrin (TPPS) was investigated in different experimental conditions. Under mild acidic conditions, protonated amino groups allow for the assembly by electrostatic interaction with the diacid form of TPPS, leading to hybrid nanomaterials. The presence of only one pendant amino group for a chain in EDA does not lead to any aggregation, whereas EPA (with four amine groups for chain) is effective in inducing J-aggregation using different mixing protocols. These nanohybrids have been characterized through UV/Vis extinction, fluorescence emission, resonance light scattering and circular dichroism spectroscopy. Their morphology and chemical composition have been elucidated through transmission electron microscopy (TEM) and scanning transmission electron microscopy (STEM). TEM and STEM analysis evidence single or bundles of MWCNTs in contact with TPPS J-aggregates nanotubes. The nanohybrids are quite stable for days, even in aqueous solutions mimicking physiological medium (NaCl 0.15 M). This property, together with their peculiar optical features in the therapeutic window of visible spectrum, make them potentially useful for biomedical applications.

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Synthesis, properties, and applications of carbon nanotubes filled with foreign materials: a review

Cited by 122 publications

References 166 publications

Recent Advances in Self-Supported Layered Double Hydroxides for Oxygen Evolution Reaction

Recent Advances in Self-Supported Layered Double Hydroxides for Oxygen Evolution Reaction

Light-Induced Sulfur Transport inside Single-Walled Carbon Nanotubes

Novel Nanohybrids Based on Supramolecular Assemblies of Meso-tetrakis-(4-sulfonatophenyl) Porphyrin J-aggregates and Amine-Functionalized Carbon Nanotubes

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