Nitrogen-doped graphite encapsulated Fe/Fe3C nanoparticles and carbon black for enhanced performance towards oxygen reduction

Zhu, Jin; Zewei, Xiong; Zheng, Jiming; Luo, Zhenyue; Zhu, Guorui; Xiao, Chao; Zhang, Meng; Li, Yibing; KunLuo,

doi:10.1016/j.jmst.2019.07.008

Cited by 33 publications

(14 citation statements)

References 38 publications

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“…Oxygen-containing surface functional groups were identified in both C1s and O1s spectra and included the C-O bonds (as hydroxyl C-OH or ether C-O-C), carbonyl groups (C=O), and carboxyl groups (O=C-OH). Model fits (Table 1) are consistent with prior models for black carbon [41][42][43]. While π−π stacking could be the predominating physisorption mechanism between carbamazepine and BC-Mag, the surface O groups could also contribute to binding.…”

Section: Characterization Of Black Carbon Magnetitesupporting

confidence: 76%

Facile Synthesis and Reuse of Magnetic Black Carbon Magnetite (BC-Mag) for Fast Carbamazepine Removal from Water

Cai

Larese-Casanova

2020

Nanomaterials

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Magnetic carbonaceous nanomaterials are needed in water treatment applications because they can offer both carbon surfaces for sorption of organic pollutants and ease of material magnetic retrieval for regeneration and reuse. In this study, we employed a facile one-step method to synthesize a black carbon-magnetite composite (BC-Mag) by high-temperature annealing of black carbon and hematite. The nanocomposite was easily dispersed and stable in water owing to the presence of negatively charged oxygen surface functional groups. Sorption kinetics with dissolved carbamazepine showed a rapid initial uptake with equilibrium achieved within only minutes. The sorption extent can be described with the Freundlich model, and surface area normalized sorption affinity was an order of magnitude greater than conventional granular activated carbon. The sorption extent of neutral carbamazepine remained constant between pH 2–10 while surface zeta potential decreased. BC-Mag can be reused for the sorption of carbamazepine up to six times without significant loss of the sorption extent.

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Section: Characterization Of Black Carbon Magnetitesupporting

confidence: 76%

Facile Synthesis and Reuse of Magnetic Black Carbon Magnetite (BC-Mag) for Fast Carbamazepine Removal from Water

Cai

Larese-Casanova

2020

Nanomaterials

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“…The large Fe nanoparticles (Fe NPs) observed for C−Fe‐PANI‐100,000 appear to exist on the surface of the particles. Because the Fe NPs located on the surface were removed by AL treatment, these Fe NPs are presumed to be encapsulated by nitrogen‐doped carbon layers near the particle surface, as revealed by high‐resolution TEM measurements in a recent paper . In further magnified images, we can find numerous fine Fe NPs as white dots inside the catalyst particle for C−Fe‐PANI‐5,000 (Figure c‐ 2 ), while such fine NPs were not observed for C−Fe‐PANI‐100,000 (Figure c‐ 1 ).…”

Section: Methodsmentioning

confidence: 72%

Pyrolysis of Iron‐Containing Polyanilines under Micropore Generation Control: Electrocatalytic Performance in the Oxygen Reduction Reaction

et al. 2020

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Pyrolyzed iron-containing polyaniline (CÀ Fe-PANI) is one of the most promising candidates as a non-precious metal based electrocatalyst for oxygen reduction reaction (ORR). Although the ORR activity depends on the surface area arisen from pyrolysis-generated micropores on CÀ Fe-PANI particles, the micropore generation is hindered by pyrolysis-formed iron nanoparticles (Fe NPs) embedded inside CÀ Fe-PANI particles. Here, we demonstrate the pyrolysis of iron-containing PANIs under suppression of micropore-generation hindrance by blocking the Fe NPs formation. The higher-molecular-weight (MW: 100,000) PANI was dispersed in an FeCl 3 solution before pyrolysis for preventing FeCl 3 penetration inside PANI particles. As a result, as compared to the case of lower-MW (5,000) PANI, the Fe NPs formation was more suppressed inside catalyst particles to give 1.9 (1.8) times micropore volume (specific surface area), leading to a 11 % higher current density in ORR electrocatalytic performance test in acidic media. Polymer electrolyte fuel cells (PEFCs) attract considerable attentions as potential power sources for both stationary and mobile applications. [1] To increase energy conversion efficiency, Pt-based materials are currently employed as the catalysts for both hydrogen oxidation reactions (HORs) at the anode and oxygen reduction reactions (ORRs) at the cathode. [1c] However, due to kinetically sluggish ORRs, as compared to HOR, a relatively large amount of Pt would need to be used at the cathode, making PEFCs too expensive to be applied as practical power sources. For the widespread application of PEFCs, therefore, a low-cost ORR catalyst with high performance must be developed. From such a view point, low-Pt or non-precious metal based electrocatalysts have been developed for ORR. Among them, non-precious metal based catalysts attract attentions because of their low cost. This seems to evolve from the report on ORR catalytic activity of Cophthalocyanine, [2] one of the N 4-chelate complexes. After that, the stability of N 4-chelates in acidic media was enhanced through the thermal pretreatment on carbon supports. [3] Since then, a huge number of researchers have reported a wide variety of analogous carbonaceous materials containing heteroatoms (e. g. N, B, P, S) and/or transition metal species (e. g. Fe, Co, Cu, Mn, Ni) with or without carbon supports. [4] On the other hand, polyaniline (PANI) is well known as one of the conducting polymers possessing the redox properties. Thus far, we have reported complexation of PANI with various transition metals [5] and catalytic reactions [6] mediated by the complexes. In this case, d-π conjugated systems are considered to be formed. Meanwhile, PANI is one of the most promising candidates as a precursor for ORR electrocatalysts. The pyrolyzed products of such complexes or mixtures comprising transition metals and PANIs

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“…A cathodic catalyst of nitrogen doped graphite encapsulated Fe/Fe 3 C and carbon black (Fe/Fe 3 C@NC/CB) has been developed. 144 In both the acidic and alkaline solutions, the Reproduced with permission. 144 Copyright 2019, Elsevier.…”

Section: Multiphase Carbon Materials As Catalyst Supportmentioning

confidence: 99%

Section: Multiphase Carbon Materials As Catalyst Supportmentioning

confidence: 99%

Performance and application of carbon-based electrocatalysts in direct methanol fuel cell

Baruah

Deb

2021

Mater. Adv.

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Nitrogen-doped graphite encapsulated Fe/Fe3C nanoparticles and carbon black for enhanced performance towards oxygen reduction

Cited by 33 publications

References 38 publications

Facile Synthesis and Reuse of Magnetic Black Carbon Magnetite (BC-Mag) for Fast Carbamazepine Removal from Water

Facile Synthesis and Reuse of Magnetic Black Carbon Magnetite (BC-Mag) for Fast Carbamazepine Removal from Water

Pyrolysis of Iron‐Containing Polyanilines under Micropore Generation Control: Electrocatalytic Performance in the Oxygen Reduction Reaction

Performance and application of carbon-based electrocatalysts in direct methanol fuel cell

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