Iron–polypyrrole electrocatalyst with remarkable activity and stability for ORR in both alkaline and acidic conditions: a comprehensive assessment of catalyst preparation sequence

Tran, Tri; Song, Min Young; Singh, Kiran; Yang, Dae Soo; Yu, Jong-Sung

doi:10.1039/c6ta01543c

Cited by 92 publications

(56 citation statements)

References 82 publications

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“…We ran Raman spectroscopy to detect the degree of graphitization in V‐NCNs‐x samples. As shown in Figure e, all the samples showed two bands centered at 1338 and 1592 cm −1 , assigned to the disordered/defected carbon (D band) and graphitic sp 2 carbon (G band), respectively . For V‐NCNs‐600, the peak intensity ratio of I D / I G was determined to be 0.81 suggesting a graphitic structure, in agreement with the XRD results (Figure S3) .…”

Section: Methodssupporting

confidence: 84%

Selective Aerobic Oxidation of Lactate to Pyruvate Catalyzed by Vanadium‐Nitrogen‐Doped Carbon Nanosheets

et al. 2019

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The catalytic oxidative dehydrogenation of lactates with molecular oxygen is a promising yet challenging route for producing high‐value pyruvates from biomass. Here we report a simple synthetic strategy for preparing nitrogen‐doped carbon nanosheets (NCNs) starting from two abundant precursors, cheap melamine and glucose, and using a simple thermal‐annealing process. The resulting NCNs feature numerous edges and holes for anchoring vanadium oxides (V‐NCNs). This creates cooperative catalytic sites that boost the catalytic oxidation of ethyl lactate to ethyl pyruvate. Additionally, we systematically studied the surface nitrogen species of NCNs by varying the pyrolysis temperature, and found that the active pyridinic N‐oxide species formed in a high thermal‐annealing treatment, acting synergistically with vanadium active sites in converting ethyl lactate with oxygen into ethyl pyruvate under mild conditions.

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Section: Methodssupporting

confidence: 84%

Selective Aerobic Oxidation of Lactate to Pyruvate Catalyzed by Vanadium‐Nitrogen‐Doped Carbon Nanosheets

et al. 2019

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“…According to some reports, the pyridinic‐N and graphitic‐N are good for ORR because pyridinic‐N can strengthen O 2 absorption and graphitic‐N can enhance conductivity, respectively . In Figure c, the C 1s peak can be fitted to C=C (284.8 eV), C=N&C–O (285.8 eV), C–N&C=O (287.1 eV) and O–C=O (289.6 eV), proving that the C atoms are combined with N and O atoms . As for the O 1s spectra (Figure d), three peaks observed at 530.2 eV, 531.2 eV and 532.7 eV, are assigned to Fe–O bond in Fe 2 O 3 , C=O, O‐C=O and physically absorbed O respectively …”

Section: Resultsmentioning

confidence: 77%

Fe₂O₃ Nanoparticles Modified 2D N‐Doped Porous Graphene‐like Carbon as an Efficient and Robust Electrocatalyst for Oxygen Reduction Reaction

Wang

Liu

et al. 2019

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As the high expense and poor stability of Pt-based catalysts have severely limited the commercial applications of cathodic catalysts in fuel cells, the steps towards developing low-cost and stable catalysts for oxygen reduction reaction (ORR) have never stopped. In this work, we designed a Fe 2 O 3 nanoparticles decorated 2D N-doped porous graphene-like carbon material (Fe(1.0)-N/C-800) from the one-step pyrolysis of low-cost and abundant substrates (β-cyclodextrin, urea and FeCl 3 ) under N 2 atmosphere. The doped N can change the charge distribution of C atoms around N atoms and offer active N species such as pyridinic-N and graphitic-N to provide more ORR active sites. The appropriate Fe 2 O 3 nanoparticles encapsulated in the graphene-like carbon layer can enhance the electron and O 2 transfer and boost the ORR process. Therefore, the synergetic effect of Fe 2 O 3 nanoparticles modifying and N doping can greatly promote the ORR process. The study on the poisoning of Fe 3 + by SCNfurther reveals that the Fe 2 O 3 nanoparticles wrapped in the carbon layer will coordinate with N to form Fe-N x active sites, which can further enhance ORR activity. Thus, the obtained Fe(1.0)-N/C-800 electrocatalyst possesses excellent ORR catalytic performance in alkaline media (E onset = 0.937 V, E 1/2 = 0.832 V) as well as a superior methanol tolerance and long-term test stability both in alkaline and acidic media. This work leads a simple and cost-efficient way to fabricate high-performance ORR catalysts.

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“…Electrocatalytic activity for ORR is significantly influenced by pyrolysis temperature due to changes in chemical components and types of active sites as well as surface area and porosity in the generated carbon framework . To find out the optimal pyrolysis temperature, the mixture of bio‐char and Fe(acac) 3 was pyrolysis at different temperatures from 700 to 1000 °C.…”

Section: Resultsmentioning

confidence: 99%

“…It has been demonstrated that both pyridinic N and graphitic N species play as active centers for ORR, whereas oxidized N is inactive for ORR. Thus, it is generally accepted that higher percentage of pyridinic N and graphitic N is correlated with high ORR catalytic activity of the catalyst materials ,…”

Section: Resultsmentioning

confidence: 99%

Iron Phosphide Incorporated into Iron‐Treated Heteroatoms‐Doped Porous Bio‐Carbon as Efficient Electrocatalyst for the Oxygen Reduction Reaction

et al. 2018

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The development of electrocatalysts from inexpensive, natural sources has been an attractive subject owing to economic, environmental, sustainable, and social merits. Herein, Fe-treated heteroatoms (N, P, and S)-doped porous carbons are synthesized for the first time by pyrolysis of bio-char derived from abundant human urine waste as a single precursor for carbon and heteroatoms, using iron(III) acetylacetonate as an external Fe precursor, followed by acid leaching and activation with a second pyrolysis step in NH 3 . In particular, the sample prepared at a pyrolysis temperature of 800 8C (FeP-NSC-800) contains iron phosphide (FeP, Fe 2 P) in the high-porosity heteroatoms-doped carbon framework along with Fe traces, and exhibits excellent oxygen reduction reaction (ORR) activity and stability in both alkaline and acidic electrolytes as demonstrated in half-and single-cell tests. Such excellent ORR catalytic performance is ascribed to a synergistic effect of not only multiple active FeÀP, FeÀN, and pyridinic and graphitic N species in the electrocatalyst but also facile transport channels provided by its hierarchical porous structure with micro-/mesopores. In addition, the sample exhibits high long-term durability and methanol crossover resistance.

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Iron–polypyrrole electrocatalyst with remarkable activity and stability for ORR in both alkaline and acidic conditions: a comprehensive assessment of catalyst preparation sequence

Abstract: Fe-treated N-doped carbon prepared from polypyrrole in the presence of a ferric source employing a pyrolysis–leaching–stabilization synthesis protocol was found to show remarkable oxygen reduction activity.

Cited by 92 publications

References 82 publications

Selective Aerobic Oxidation of Lactate to Pyruvate Catalyzed by Vanadium‐Nitrogen‐Doped Carbon Nanosheets

Selective Aerobic Oxidation of Lactate to Pyruvate Catalyzed by Vanadium‐Nitrogen‐Doped Carbon Nanosheets

Fe₂O₃ Nanoparticles Modified 2D N‐Doped Porous Graphene‐like Carbon as an Efficient and Robust Electrocatalyst for Oxygen Reduction Reaction

Iron Phosphide Incorporated into Iron‐Treated Heteroatoms‐Doped Porous Bio‐Carbon as Efficient Electrocatalyst for the Oxygen Reduction Reaction

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Iron–polypyrrole electrocatalyst with remarkable activity and stability for ORR in both alkaline and acidic conditions: a comprehensive assessment of catalyst preparation sequence

Abstract: Fe-treated N-doped carbon prepared from polypyrrole in the presence of a ferric source employing a pyrolysis–leaching–stabilization synthesis protocol was found to show remarkable oxygen reduction activity.

Cited by 92 publications

References 82 publications

Selective Aerobic Oxidation of Lactate to Pyruvate Catalyzed by Vanadium‐Nitrogen‐Doped Carbon Nanosheets

Selective Aerobic Oxidation of Lactate to Pyruvate Catalyzed by Vanadium‐Nitrogen‐Doped Carbon Nanosheets

Fe2O3 Nanoparticles Modified 2D N‐Doped Porous Graphene‐like Carbon as an Efficient and Robust Electrocatalyst for Oxygen Reduction Reaction

Iron Phosphide Incorporated into Iron‐Treated Heteroatoms‐Doped Porous Bio‐Carbon as Efficient Electrocatalyst for the Oxygen Reduction Reaction

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Fe₂O₃ Nanoparticles Modified 2D N‐Doped Porous Graphene‐like Carbon as an Efficient and Robust Electrocatalyst for Oxygen Reduction Reaction