FeCo-N-C oxygen reduction electrocatalysts: Activity of the different compounds produced during the synthesis via pyrolysis

Galiote, Nelson A.; Oliveira, Francisca Elenice Rodrigues de; Lima, Fabio H. B.

doi:10.1016/j.apcatb.2019.04.057

Cited by 60 publications

(28 citation statements)

References 38 publications

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“…X-ray diffraction (XRD) patterns ( Figure 1b) show two broad humps at around 26° and 44°, assigning to the (002) and (101) planes of graphitic carbon. [39][40][41] To check the morphology of the as-prepared CuZn/NC, scanning electron microscopy (SEM) and transmission electron microscopy (TEM) were performed as depicted in Figure 1c and Figure S2 (Supporting Information). As shown in Figure 1c, the high-angle annular dark-field transmission electron microscopy (HAADF-STEM) image of CuZn/NC shows a homogeneous dispersion of CuZn sub-nanoclusters.…”

Section: Resultsmentioning

confidence: 99%

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Engineering Atomic Sites via Adjacent Dual‐Metal Sub‐Nanoclusters for Efficient Oxygen Reduction Reaction and Zn‐Air Battery

Liu

et al. 2020

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N‐coordinated transition‐metal materials are crucial alternatives to design cost‐effective, efficient, and highly durable catalysts for electrocatalytic oxygen reduction reaction. Herein, the synthesis of uniformly distributed Cu−Zn clusters on porous N‐doped carbon, which are accompanied by Cu/Zn‐Nx single sites, is demonstrated. X‐ray absorption fine structure tests reveal the co‐existence of M−N (M = Cu or Zn) and M−M bonds in the catalyst. The catalyst shows excellent oxygen reduction reaction (ORR) performance in an alkaline medium with a positive half‐wave potential of 0.884 V, a superior kinetic current density of 36.42 mA cm−2 at 0.85 V, and a Tafel slope of 45 mV dec−1, all of which are among the best‐reported results. Furthermore, when employed as an air cathode in Zn‐Air battery, it reveals a high open‐cycle potential of 1.444 V and a peak power density of 164.3 mW cm−2. Comprehensive experiments and theoretical calculations approved that the high activity of the catalyst can be attributed to the collaboration of the Cu/Zn‐N4 sites with CuZn moieties on N‐doped carbons.

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Section: Resultsmentioning

confidence: 99%

“…X‐ray diffraction (XRD) patterns (Figure 1b) show two broad humps at around 26° and 44°, assigning to the (002) and (101) planes of graphitic carbon. [ 39–41 ]…”

Section: Resultsmentioning

confidence: 99%

Engineering Atomic Sites via Adjacent Dual‐Metal Sub‐Nanoclusters for Efficient Oxygen Reduction Reaction and Zn‐Air Battery

Liu

et al. 2020

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“…[7,8] It is generally believed that MÀ N x species are the highly effective ORR active sites for MÀ NÀ C electrocatalysts. [9][10][11][12] In contrast, some studies have suggested that the N-doped carbon encapsulated metal nanoparticles are also highly active towards ORR, in which the metal nanoparticles can activate the surrounding N-doped graphitic layers. [13] More recently, it has been shown that incorporating another transition metal in MÀ NÀ C to form bimetallic M 1 M 2 À NÀ C catalysts can synergistically improve the catalytic performance.…”

Section: Introductionmentioning

confidence: 99%

“…The exact nature of the active sites of M−N−C remains elusive [7,8] . It is generally believed that M−N x species are the highly effective ORR active sites for M−N−C electrocatalysts [9–12] . In contrast, some studies have suggested that the N‐doped carbon encapsulated metal nanoparticles are also highly active towards ORR, in which the metal nanoparticles can activate the surrounding N‐doped graphitic layers [13] …”

Section: Introductionmentioning

confidence: 99%

Fe/Co Containing N‐Doped Hierarchical Porous Carbon Microcuboids and Microcylinders as Efficient Catalysts for Oxygen Reduction Reaction

et al. 2020

ChemCatChem

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Transition metal-nitrogen-carbon (MÀ NÀ C) materials have received extensive attention as promising catalysts for oxygen reduction reaction (ORR). The surface morphology and the pore structure of the carbon supports have important effects on the ORR activity. Herein, metal-organic complexes were prepared via a simple NaOH-mediated method by the organometallic reaction of Fe 3 + /Co 2 + ions and benzimidazole in the presence of polyvinylpyrrolidone. Metal-organic complexes with either cuboid or cylindrical morphologies were obtained by modulating the initial ratio of Fe 3 + /Co 2 +. FeCo containing N-doped carbon catalysts (Fe x Co y À NÀ C) decorated with Fe x Co y nano-particles were then fabricated by a direct carbonization of the metal-organic complexes. Fe x Co y À NÀ C catalysts have hierarchical micro-/mesoporous structure and retain the morphologies of microcuboids and microcylinders of the metal-organic complexes precursors. The Fe 1 Co 7 À NÀ C exhibits promising catalytic activity with an onset potential of 0.967 V, a half-wave potential of 0.816 V, and a limiting current density of 4.86 mA cm À 2 in 0.1 M KOH. The ORR catalytic activity should be attributed to the FeCoÀ N x active sites and the encapsulated FeCo alloy nanoparticles activating the surrounding N-doped carbon layers.

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“…Essa evidência sugere que as estruturas de ferro coordenadas com nitrogênio estão bem dispersas sobre o carbono, sem formação de espécies secundárias. Por exemplo, nanopartículas de metal encapsuladas em nitretos/óxidos de metal, que poderiam ser formados, tendem a diminuir a atividade catalítica da RRO [30,31]. Determinou-se o trabalho realizado, desde a neutralização da solução ácida originária de HCl em pH = 2, em solução salina de NaCl a pH = 6, após a adição de NaOH (com adição de NaCl da água do mar ou do produto da reação de neutralização de ciclos anteriores [9]), por meio da área entre as curvas mostradas na Figura 39 (a) por três ciclos, os quais estão associados às reações eletroquímicas da bateria fotoassistida e da célula eletrolítica de íon sódio-ar a 5 μA cm -2 .…”

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FeCo-N-C oxygen reduction electrocatalysts: Activity of the different compounds produced during the synthesis via pyrolysis

Cited by 60 publications

References 38 publications

Engineering Atomic Sites via Adjacent Dual‐Metal Sub‐Nanoclusters for Efficient Oxygen Reduction Reaction and Zn‐Air Battery

Engineering Atomic Sites via Adjacent Dual‐Metal Sub‐Nanoclusters for Efficient Oxygen Reduction Reaction and Zn‐Air Battery

Fe/Co Containing N‐Doped Hierarchical Porous Carbon Microcuboids and Microcylinders as Efficient Catalysts for Oxygen Reduction Reaction

Captação de energia a partir de reações de neutralização

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