Nitrogen and Oxygen Functionalization of Multi‐Walled Carbon Nanotubes for Tuning the Bifunctional Oxygen Reduction/Oxygen Evolution Performance of Supported FeCo Oxide Nanoparticles

Kazakova, Мariya A.; Koul, Adarsh; Selyutin, Alexander G.; Ищенко, А. В.; Kvon, Ren I.; Kolesov, B. A.; Schuhmann, Wolfgang; Morales, Dulce M.

doi:10.1002/celc.202100556

Cited by 16 publications

(14 citation statements)

References 93 publications

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“…The obtained nanotubes had a wall number of 12–15 and an average outer and inner diameter of 9.4 and 4 nm, correspondingly. The characteristics of the used MWCNTs are described in more detail in [ 24 , 25 ]. After the growth, the MWCNT were purified from catalyst particles by boiling in a 15% solution of hydrochloric acid.…”

Section: Methodsmentioning

confidence: 99%

Dielectric Properties of Hybrid Polyethylene Composites Containing Cobalt Nanoparticles and Carbon Nanotubes

et al. 2022

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Polymer composites with electrically conductive inclusions are intensively developed for microwave shielding applications, where lightweight and elastic coatings are necessary. In this paper, dielectric properties of hybrid polyethylene composites containing cobalt nanoparticles and multi-wall carbon nanotubes (MWCNT) were investigated in the wide frequency range of 20 Hz–40 GHz for electromagnetic shielding applications. The percolation threshold in the hybrid system is close to 6.95 wt% MWCNT and 0.56 Co wt%. Cobalt nanoparticles (up to highest investigated concentration 4.8 wt%) had no impact on the percolation threshold, and for the fixed total concentration of fillers, the complex dielectric permittivity is higher for composites with bigger MWCNT concentrations. Moreover, the microwave complex dielectric permittivity of composites with high concentration of fillers is quite high (for composites with 13.4 wt% MWCNT and 1.1 wt% Co ε′ ≈ ε″ ≈ 20 at 30 GHz, it corresponds to microwave absorption 50% of 1 mm thickness plate); therefore, these composites are suitable for electromagnetic shielding applications.

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Section: Methodsmentioning

confidence: 99%

Dielectric Properties of Hybrid Polyethylene Composites Containing Cobalt Nanoparticles and Carbon Nanotubes

et al. 2022

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“…It has been further suggested that a combination of N species can lead to strong synergies and thus boost their catalytic properties. [ 107–109 ]…”

Section: Fundamentals Of Oxygen Electrocatalysis On N‐doped Carbon Ma...mentioning

confidence: 99%

“…The N‐MWCNTs exhibited activity toward the ORR and OER, being the sample grown in the presence of 8 vol% NH 3 the one that displayed the lowest overpotentials for the two reactions. [ 107 ] Generally, the nanocarbon prepared via CVD possesses a uniform graphitic structure and high electrical conductivity.…”

Section: Synthesis Of N‐doped Carbon‐based Oxygen Electrocatalystsmentioning

confidence: 99%

“…It has been further suggested that a combination of N species can lead to strong synergies and thus boost their catalytic properties. [107][108][109] Overall, doping of carbon-based catalysts with nitrogen has received more attention than doping with other heteroatoms due to three main advantages that promote the mechanisms of the OER and ORR.…”

Section: Nitrogen Atoms As Electrocatalytic Active Sitesmentioning

confidence: 99%

“…[4] N-doping may also increase the electrical conductivity, thus further reducing the energy input requirements. [107,156,157] In general, bifunctional oxygen electrocatalysts require a small energy barrier between the involved intermediate species during the charge transfer steps to minimize overpotentials. Additionally, a high surface area with suitable electrode porosity is desirable in order to maximize the accessibility to active sites.…”

Section: N-doped Carbons As Bifunctional Oxygen Electrocatalystsmentioning

confidence: 99%

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Nitrogen‐Rich Carbonaceous Materials for Advanced Oxygen Electrocatalysis: Synthesis, Characterization, and Activity of Nitrogen Sites

Meng

Morales

et al. 2022

Adv Funct Materials

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104

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Nitrogen‐doped carbons are among the fastest‐growing class of materials used for oxygen electrocatalysis, namely, the oxygen reduction reaction (ORR) and oxygen evolution reaction (OER), thanks to their low cost, environmental friendliness, excellent electrical conductivity, and scalable synthesis. The perspective of replacing precious metal‐based electrocatalysts with nitrogen‐doped carbon is highly desirable for reducing costs in energy conversion and storage systems. In this review, the role of nitrogen and N‐induced structural defects on the enhanced performance of N‐doped carbon electrocatalysts toward the OER and the ORR as well as their applications for energy conversion and storage technologies is summarized. The synthesis of N‐doped carbon electrocatalysts and the characterization of their nitrogen functional groups and active sites for the conversion of oxygen are also reviewed. The electrocatalytic performance of the main types of N‐doped carbon materials for OER/ORR electrocatalysis are then discussed. Finally, major challenges and future opportunities of N‐doped carbons as advanced oxygen electrocatalysts are highlighted.

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MnFeNi‐Based Composite as a Case Study of a Bifunctional Oxygen Electrocatalyst under Dynamically Changing Electrode Potentials

Morales,

Kazakova,

Medina

et al. 2024

ChemCatChem

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High‐performance electrocatalysts for the oxygen reduction (ORR) and oxygen evolution reaction (OER) are essential components in energy conversion and storage technologies. Yet, their poor reversibility hinders their applicability. A highly active ORR/OER catalyst, consisting of multiwalled carbon nanotubes‐supported MnFeNiOx nanoparticles, was subjected to sequences of chronoamperometric steps alternating between the ORR, the OER and highly cathodic potentials (Ec). Rotating ring disk electrode methods revealed that applying Ec leads to a small increase in the current and peroxide species yield during the ORR while enhancing substantially the OER. X‐ray absorption spectroscopy showed irreversible changes in the chemical state of MnFeNiOx correlating with its catalytic properties. The complexity of changes that a composite catalyst may undergo under varying potentials, the importance of monitoring product formation, and the convenience of using dynamic electrochemical sequences for the assessment of catalyst reversibility, as well as for the activation and/or restoration of their catalytic properties are highlighted.

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Nitrogen and Oxygen Functionalization of Multi‐Walled Carbon Nanotubes for Tuning the Bifunctional Oxygen Reduction/Oxygen Evolution Performance of Supported FeCo Oxide Nanoparticles

Cited by 16 publications

References 93 publications

Dielectric Properties of Hybrid Polyethylene Composites Containing Cobalt Nanoparticles and Carbon Nanotubes

Dielectric Properties of Hybrid Polyethylene Composites Containing Cobalt Nanoparticles and Carbon Nanotubes

Nitrogen‐Rich Carbonaceous Materials for Advanced Oxygen Electrocatalysis: Synthesis, Characterization, and Activity of Nitrogen Sites

MnFeNi‐Based Composite as a Case Study of a Bifunctional Oxygen Electrocatalyst under Dynamically Changing Electrode Potentials

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