Fe/Fe<sub>3</sub>C@C nanoparticles encapsulated in N-doped graphene–CNTs framework as an efficient bifunctional oxygen electrocatalyst for robust rechargeable Zn–air batteries

Wang, Qichen; Lei, Yongpeng; Chen, Zhiyan; Wu, Nan; Wang, Yaobing; Wang, Bing; Wang, Kunjie

doi:10.1039/c7ta08423d

Cited by 383 publications

(157 citation statements)

References 58 publications

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“…Notably,t he porous carbon surface obtained at ap yrolysis temperature of 850 8Cw as interwove with bamboo-like carbon nanotubes (Figures 1a andS 3g), which is considered to be an excellent heterostructure for catalysis. [38,39] As shown in Figure S3 d, there are about twenty Co NPs in Co-NSPC-550. As the pyrolysis temperature was increased from 700 to 1000 8C, Co NPs werec learly observed with increasing sizes from 15.26 to 24.93 nm (Figure 1d and S3 f, h).…”

Section: Resultsmentioning

confidence: 98%

Cobalt Entrapped in N,S‐Codoped Porous Carbon: Catalysts for Transfer Hydrogenation with Formic Acid

et al. 2019

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Catalysts with Co nanoparticles (NPs) entrapped in N,S‐codoped carbon shells were successfully fabricated by pyrolysis of porous organic polymers (POPs) with cobalt salts. The encapsulated structure consisting of Co NPs and N,S‐codoped carbon layers was verified by TEM, XRD, and X‐ray photoelectron spectroscopy. The catalysts displayed excellent activity and stability for the catalytic transfer hydrogenation (CTH) of nitrobenzene with formic acid under base‐free conditions. Furthermore, the resultant catalysts allowed for highly efficient and selective transfer hydrogenation of various functionalized nitroarenes to the corresponding anilines. Through control experiments, the covered Co NPs were identified as active sites for CTH. The incorporation of S into the N‐doped carbon lattice promoted the electron transfer from metallic cobalt NPs to their shells, which played a significant role in the acceleration of CTH. Moreover, the Co‐NSPC‐850 catalyst pyrolyzed at 850 °C showed excellent stability in the recycling experiments.

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Section: Resultsmentioning

confidence: 98%

Cobalt Entrapped in N,S‐Codoped Porous Carbon: Catalysts for Transfer Hydrogenation with Formic Acid

et al. 2019

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“…The obtained results proved a higher catalytic activity for the composite electrode, with respect to pure Pt/C, in terms of electrochemically active surface area, oxygen reduction current density, onset potential and stability.Oxygen electrochemistry plays a key role either in energy conversion or in energy storage, because of its importance in several technologies, such as fuel cells and metal-air batteries, both in acid and alkaline environment. [1][2][3][4] Although Pt/C catalysts are widely used as oxygen electrode, there is the need to find new, efficient, stable and less expensive materials to be used as cathodes. [5][6][7] Considerable efforts in the last decade were addressed to improve the electrochemical oxygen reduction reaction and to reduce Pt loading, in order to achieve lowcost targets.…”

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confidence: 99%

Enhancing Oxygen Reduction Reaction Catalytic Activity Using a Sub‐Stoichiometric CaTiO_3−δ Additive

et al. 2019

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Platinum scarcity and its high cost have led to the requirement of alternative materials catalysing the oxygen reduction reaction (ORR), which is the main rate‐determining step occurring in electrochemical devices, including metal‐air batteries and fuel cells. We report a study on a sub‐stoichiometric calcium titanate (CaTiO3−δ, CTO) compound used as promoter for the ORR in order to reduce the Pt loading and improve its electrocatalytic activity. Composite catalysts based on Pt/C with different amounts of CTO were prepared and their activity was investigated by rotating disk electrode (RDE). The obtained results proved a higher catalytic activity for the composite electrode, with respect to pure Pt/C, in terms of electrochemically active surface area, oxygen reduction current density, onset potential and stability.

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“…Carbon nanotubes (CNTs), consisting of at hin planar sheet of sp 2 -bonded carbon atoms denselyp acked in ah oneycomb crystal lattice, were first reportedb yL ijima in 1991. [1] Due to their high surfacea rea and excellent electronic conductivity, [2][3][4][5][6] CNTsa re good supports for metals to promote chemical reactions. Severalr eports in the literature have shown that CNTsupported transition metals exhibit much-enhanced activity in oxygen reduction reactions (ORRs).…”

Section: Introductionmentioning

confidence: 99%

A Reusable CNT‐Supported Single‐Atom Iron Catalyst for the Highly Efficient Synthesis of C−N Bonds

Ding

Huang

et al. 2020

Chemistry A European J

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C−N bond formation is regarded as a very useful and fundamental reaction for the synthesis of nitrogen‐containing molecules in both organic and pharmaceutical chemistry. Noble‐metal and homogeneous catalysts have frequently been used for C−N bond formation, however, these catalysts have a number of disadvantages, such as high cost, toxicity, and low atom economy. In this work, a low‐toxic and cheap iron complex (iron ethylene‐1,2‐diamine) has been loaded onto carbon nanotubes (CNTs) to prepare a heterogeneous single‐atom catalyst (SAC) named Fe‐Nx/CNTs. We employed this SAC in the synthesis of C−N bonds for the first time. It was found that Fe‐Nx/CNTs is an efficient catalyst for the synthesis of C−N bonds starting from aromatic amines and ketones. Its catalytic performance was excellent, giving yields of up to 96 %, six‐fold higher than the yields obtained with noble‐metal catalysts, such as AuCl3/CNTs and RhCl3/CNTs. The catalyst showed efficacy in the reactions of thirteen aromatic amine substrates, without the need for additives, and seventeen enaminones were obtained. High‐angle annular dark‐field scanning transmission electron microscopy in combination with X‐ray absorption spectroscopy revealed that the iron species were well dispersed in the Fe‐Nx/CNTs catalyst as single atoms and that Fe‐Nx might be the catalytic active species. This Fe‐Nx/CNTs catalyst has potential industrial applications as it could be cycled seven times without any significant loss of activity.

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Fe/Fe₃C@C nanoparticles encapsulated in N-doped graphene–CNTs framework as an efficient bifunctional oxygen electrocatalyst for robust rechargeable Zn–air batteries

Abstract: 3d transition metals or their derivatives encapsulated in nitrogen-doped nanocarbon show promising potential in non-precious metal oxygen electrocatalysts.

Cited by 383 publications

References 58 publications

Cobalt Entrapped in N,S‐Codoped Porous Carbon: Catalysts for Transfer Hydrogenation with Formic Acid

Cobalt Entrapped in N,S‐Codoped Porous Carbon: Catalysts for Transfer Hydrogenation with Formic Acid

Enhancing Oxygen Reduction Reaction Catalytic Activity Using a Sub‐Stoichiometric CaTiO_3−δ Additive

A Reusable CNT‐Supported Single‐Atom Iron Catalyst for the Highly Efficient Synthesis of C−N Bonds

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Fe/Fe3C@C nanoparticles encapsulated in N-doped graphene–CNTs framework as an efficient bifunctional oxygen electrocatalyst for robust rechargeable Zn–air batteries

Abstract: 3d transition metals or their derivatives encapsulated in nitrogen-doped nanocarbon show promising potential in non-precious metal oxygen electrocatalysts.

Cited by 383 publications

References 58 publications

Cobalt Entrapped in N,S‐Codoped Porous Carbon: Catalysts for Transfer Hydrogenation with Formic Acid

Cobalt Entrapped in N,S‐Codoped Porous Carbon: Catalysts for Transfer Hydrogenation with Formic Acid

Enhancing Oxygen Reduction Reaction Catalytic Activity Using a Sub‐Stoichiometric CaTiO3−δ Additive

A Reusable CNT‐Supported Single‐Atom Iron Catalyst for the Highly Efficient Synthesis of C−N Bonds

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Fe/Fe₃C@C nanoparticles encapsulated in N-doped graphene–CNTs framework as an efficient bifunctional oxygen electrocatalyst for robust rechargeable Zn–air batteries

Enhancing Oxygen Reduction Reaction Catalytic Activity Using a Sub‐Stoichiometric CaTiO_3−δ Additive