Noncovalent functionalization of pristine CVD single-walled carbon nanotubes with 3d metal(II) phthalocyanines by adsorption from the gas phase

Basiuk, Vladimir A.; Flores-Sánchez, Laura J.; Meza-Laguna, Víctor; Flores-Flores, José O.; Bucio-Galindo, Lauro; Puente-Lee, Iván; Basiuk, Elena V.

doi:10.1016/j.apsusc.2017.12.122

Cited by 36 publications

(40 citation statements)

References 90 publications

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“…Comparison of the infrared spectra for phthalocyanine complexes with divalent cations (Mn 2+ , Fe 2+ , Co +2 and Ni 2 + ), pristine SWCNTs and SWCNTs+MPc hybrids is presented in Figure . One should note that, as it is usually observed, the overall quality of FTIR spectra for CNTs‐based samples is rather low due to a low signal‐to‐noise ratio, resulting from a considerable heterogeneity of bundled nanotube samples and a strong absorption of infrared radiation. An evident exception is the spectrum of SWCNTs+MnPc hybrids, which can be attributed to some SWCNTs reordering during liquid‐phase deposition of MnPc.…”

Section: Resultsmentioning

confidence: 99%

“…The fact that no evident presence of MPc crystallites can be detected by SEM in any of the samples suggests the formation of a relatively homogeneous layer (probably a monolayer) of adsorbed phthalocyanine molecules on nanotube sidewalls. A similar behavior was observed previously for both free‐base H 2 Pc and its transition metal complexes . The morphology and size of MPcs crystals are different from those of nanotubes and can be distringuised in the SEM images from pure or isolated MPc (Figure S1).…”

Section: Resultsmentioning

confidence: 99%

“…In the case of CoPc, NiPc and FePc, the resulting mixture was slightly compressed into pellets using a hydraulic press, and the gas‐phase deposition experiments were performed by heating SWCNTs+MPc mixtures under constant evacuation at about 10 −2 Torr and a selected temperature of 450 °C for 2 h (counted from the moment once the temperature stabilized). This temperature was found as optimal from our previous experiments of non‐covalent functionalization of SWCNTs with MPc complexes . The increase in weight of SWCNTs material after phthalocyanine deposition served as the most direct estimation of MPc content in the corresponding hybrid, and was of 20.2 %, 26.3 % and 28.4 % for FePc, CoPc and NiPc, respectively.…”

Section: Methodsmentioning

confidence: 99%

“…A similar behavior was observed previously for both free-base H 2 Pc [21a] and its transition metal complexes. [20] The morphology and size of MPcs crystals are different from those of nanotubes and can be distringuised in the SEM images from pure or isolated MPc ( Figure S1). On the other hand, in all SWCNTs + MPc hybrids, nanotube bundles look more 'glued' together as compared to pristine nanotubes, that is, noncovalent functionalization with MPcs produces no debundling effect (at least in the solid phase).…”

Section: Characterization Of Swcnts + Mpc Hybridsmentioning

confidence: 99%

“…The experimental setup was similar to that described previously for the sublimation of free-base phthalocyanine [21a] and its metal complexes with Co 2 + , Ni 2 + , Zn 2 + and Cu 2 + [20] in the presence of carbon nanomaterials including SWCNTs. Usually, SWCNT storage for a long time causes the accumulation of a considerable amount of impurities adsorbed from the environment.…”

Section: Functionalizationmentioning

confidence: 99%

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Oxygen Evolution Reaction on Single‐Walled Carbon Nanotubes Noncovalently Functionalized with Metal Phthalocyanines

et al. 2019

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This work reports the facile preparation of single-walled carbon nanotubes (SWCNTs) noncovalently functionalized with 3d transition metal (II) phthalocyanines MPcs (M=Mn, Fe, Co and Ni) and their electrochemical evaluation towards the oxygen evolution reaction (OER) in alkaline media. The modification of SWCNTs with MPcs improved the potential required for the oxygen evolution reaction in 0.1 M and 1 M KOH by lowering the potential by approximately 120 mV in comparison with unmodified SWCNTs, at a current density of 10 mA cm À 1 . The onset potential of the hybrids is close to the bulk Ni electrode in 1 M KOH and significantly outperforms Ni and Ir black electrodes in 0.1 M KOH solution. Nickel, cobalt and iron phthalocyanines showed auto-activation during extended cyclic voltammetry and long-term chronoamperometric measurements in both KOH concentrations. The excellent electrocatalytic activity of hybrids obtained and the straightforward method of their synthesis opens the possibility of exploring the proposed materials for applications in anion exchange membrane water electrolysis (AEMWE).

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Section: Resultsmentioning

confidence: 99%

Section: Resultsmentioning

confidence: 99%

Section: Methodsmentioning

confidence: 99%

Section: Characterization Of Swcnts + Mpc Hybridsmentioning

confidence: 99%

Section: Functionalizationmentioning

confidence: 99%

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Oxygen Evolution Reaction on Single‐Walled Carbon Nanotubes Noncovalently Functionalized with Metal Phthalocyanines

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Stable Hollow‐Structured Silicon Suboxide‐Based Anodes toward High‐Performance Lithium‐Ion Batteries

Tian

Yang

et al. 2021

Adv Funct Materials

181

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Silicon has been regarded as an attractive high-capacity anode material for next-generation lithium-ion batteries (LIBs). However, Si anodes suffer from huge volume variation during cycling, which poses a critical challenge for stable battery operation. Compared with Si, Si suboxide (SiO x ) is one of the most promising candidates for high-energy-density LIBs because of its alleviated swelling and highly stable cycling performance. Whereas, the poor electronic conductivity and low (initial) Coulombic efficiency of SiO x anodes severely hinder practical applications for LIBs. Herein, for the first time, these issues are successfully solved through rationally designing hollow-structured SiO x @carbon nanotubes (CNTs)/C architectures with graphitic carbon coatings and in situ growth of CNTs. When applied as anodes in LIBs, the SiO x @CNTs/C anodes exhibit high reversible capacity, high initial Coulombic efficiency (88%), outstanding cycling performance, and extraordinary mechanical strength during the calendaring process (200 MPa). This work paves the way for developing SiO x -based anode materials for high-energy-density LIBs.

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Identification and Understanding of Active Sites of Non‐Noble Iron‐Nitrogen‐Carbon Catalysts for Oxygen Reduction Electrocatalysis

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Non-noble iron-nitrogen-carbon (Fe-N-C) catalysts have been explored as one type of the most promising alternatives of precious platinum (Pt) in catalyzing the oxygen reduction reaction (ORR). However, their catalytic ORR activity and stability still cannot meet the requirement of practical applications. Active sites in such catalysts are the key factors determining the catalytic performance. This review gives a critical overview on identification and understanding of active sties of non-pyrolytic and pyrolytic Fe-N-C catalysts in terms of design strategies, synthesis, characterization, functional mechanisms and performance validation. The diversity and complexity of active sites that greatly dominate the progress of Fe-N-C catalysts include Fe-containing sites (Fe-based nanoparticles and single-atom Fe-species) and metalfree sites (heteroatoms doping and defects). Meanwhile, synergistic effects are also discussed in this review with emphasis on the interaction among multiple active sites. Although substantial endeavors have been devoted to develop the efficient Fe-N-C catalysts, some challenges still remain. To facilitate further research on Fe-N-C catalysts toward practical applications, some research perspectives are prospected in the aspects of innovative synthesis methods, active-sites modulation strategies, high-resolution ex situ/in situ/ operando characterization techniques, theoretical calculations, and so on. This review may provide a guideline for identifying and understanding activesites for developing high-performance Fe-N-C catalysts.

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Noncovalent functionalization of pristine CVD single-walled carbon nanotubes with 3d metal(II) phthalocyanines by adsorption from the gas phase

Cited by 36 publications

References 90 publications

Oxygen Evolution Reaction on Single‐Walled Carbon Nanotubes Noncovalently Functionalized with Metal Phthalocyanines

Oxygen Evolution Reaction on Single‐Walled Carbon Nanotubes Noncovalently Functionalized with Metal Phthalocyanines

Stable Hollow‐Structured Silicon Suboxide‐Based Anodes toward High‐Performance Lithium‐Ion Batteries

Identification and Understanding of Active Sites of Non‐Noble Iron‐Nitrogen‐Carbon Catalysts for Oxygen Reduction Electrocatalysis

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