2-Methylimidazole as a nitrogen source assisted synthesis of a nano-rod-shaped Fe/FeN@N-C catalyst with plentiful FeN active sites and enhanced ORR activity

Feng, Chao; Guo, Yuan; Qiao, Shushan; Xie, Yuehong; Zhang, Li; Zhang, Liugen; Wang, Jiaqiang; Wang, Jide

doi:10.1016/j.apsusc.2020.147481

Cited by 55 publications

(28 citation statements)

References 54 publications

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“…Besides, the phosphorus content (P at %) in the samples also displays a regular rise with the triphenylphosphine dosage added during their preparation, as shown in Tables S2 and S3. The C 1s spectra of CNP@PNS-4 in Figure c can be deconvolved into four peaks at 284.6, 285.4, 286.5 ,and 288.9 eV corresponding to CC, C–O/CN, O–CO/C–N, and O–CO, respectively, which illustrates that nitrogen atoms have been bonded with carbon successfully Figure e shows the N 1s spectra of all CNP@PNS catalysts, and the peaks at 398.4, 400.2, and 401.2 eV correspond to pyridinic-N, pyrrolic-N, and graphitic-N, respectively .…”

Section: Results and Discussionmentioning

confidence: 99%

“…The C 1s spectra of CNP@PNS-4 in Figure 5c can be deconvolved into four peaks at 284.6, 285.4, 286.5 ,and 288.9 eV corresponding to CC, C−O/CN, O−CO/C−N, and O−CO, respectively, which illustrates that nitrogen atoms have been bonded with carbon successfully. 46 Figure 5e shows the N 1s spectra of all CNP@PNS catalysts, and the peaks at 398.4, 400.2, and 401.2 eV correspond to pyridinic-N, pyrrolic-N, and graphitic-N, respectively. 47 This shows that nitrogen presents in a more stable form after high-temperature pyrolysis.…”

Section: Resultsmentioning

confidence: 99%

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Mesoporous N–P Codoped Carbon Nanosheets as Superior Cathodic Catalysts of Neutral Metal–Air Batteries

Chen

Sheng

et al. 2021

Langmuir

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Development of high-efficiency oxygen reduction reaction (ORR) catalysts under neutral conditions has made little research progress. In this work, we synthesized a three-dimensional porous N/P codoped carbon nanosheet composites (CNP@PNS) by high-temperature thermal treatment of dicyandiamide, starch, and triphenylphosphine and subsequent porous structure-making treatment using the NaCl molten salt template. In the neutral solution, the electrocatalytic performance of the CNP@PNS-4 catalyst exhibits an onset potential of 0.98 V (vs reversible hydrogen electrode) and a half-wave potential of 0.91 V for ORR, which greatly surpasses commercial Pt/C (40%). Three kinds of neutral metal−air batteries (Zn−air, Al−air, and Fe−air) using the prepared samples as cathodic catalysts were constructed, corresponding to the maximum power density of 120.2, 78.3, and 18.9 mW•cm −2 , respectively. Also, they reveal outstanding discharge stability under different current densities. The density functional theory calculation depicts the reduction of the free energy of the determining step and subsequent decline of the overpotential for ORR.

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Section: Results and Discussionmentioning

confidence: 99%

Section: Resultsmentioning

confidence: 99%

Mesoporous N–P Codoped Carbon Nanosheets as Superior Cathodic Catalysts of Neutral Metal–Air Batteries

Chen

Sheng

et al. 2021

Langmuir

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“…[139] However, a coordination strategy combined with high temperature calcination has been developed to construct a complex Fe/FeN@N-C electrocatalyst, in which the competitive coordination of 2-methylimidazole would promote the formation of active FeN sites. [140] On the other hand, by varying the pyrolysis temperature, CoN 3 sites could be successfully fabricated. [70] Through calcining a bioinspired precursor of Fe-porphyrin-coordinated imidazole on the polyvinylimidazole-grafted carbon support at elevated temperature, C@PVI-(DFTPP)Fe-800 catalyst featuring five nitrogen coordinated Fe-N x sites (FeN 5 ) has been obtained.…”

Section: M-n-c Of Other Types Of M-n X Sitesmentioning

confidence: 99%

“…M-N-C materials have been considered as promising catalysts for ORR, [140,[156][157][158][159][160][161][162][163][164][165][166][167][168] and the catalytic activity was affected by the factors such as the types of central metal atoms, the bonded atoms of N or C with metal. [169] Since Jasinski found that cobalt phthalocyanine demonstrated significant catalytic activity for ORR in 1964, [24] many strategies have been developed to explore and create highly efficient M-N-C with M-N x species.…”

Section: Oxygen Reduction Reactionmentioning

confidence: 99%

Metal–Nitrogen–Carbon Catalysts of Specifically Coordinated Configurations toward Typical Electrochemical Redox Reactions

et al. 2021

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Metal-nitrogen-carbon (M-N-C) material with specifically coordinated configurations is a promising alternative to costly Pt-based catalysts. In the past few years, great progress is made in the studies of M-N-C materials, including the structure modulation and local coordination environment identification via advanced synthetic strategies and characterization techniques, which boost the electrocatalytic performances and deepen the understanding of the underlying fundamentals. In this review, the most recent advances of M-N-C catalysts with specifically coordinated configurations of M-N x (x = 1-6) are summarized as comprehensively as possible, with an emphasis on the synthetic strategy, characterization techniques, and applications in typical electrocatalytic reactions of the oxygen reduction reaction, oxygen evolution reaction, hydrogen evolution reaction, CO 2 reduction reaction, etc., along with mechanistic exploration by experiments and theoretical calculations. Furthermore, the challenges and potential perspectives for the future development of M-N-C catalysts are discussed.

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“…The electrochemical oxygen reduction reaction (ORR) at the cathode of polymer electrolyte fuel cells has attracted extensive attention due to the sluggish reaction kinetics. 1 − 4 Currently, platinum (Pt)-based electrocatalysts are considered to be the most effective catalysts for the ORR and have been widely used. Nevertheless, they still suffer from a series of problems, such as high price, scarce resources, long-term instability, CO poisoning, and poor methanol tolerance.…”

Section: Introductionmentioning

confidence: 99%

CoFe/N, S–C Featured with Graphitic Nanoribbons and Multiple CoFe Nanoparticles as Highly Stable and Efficient Electrocatalysts for the Oxygen Reduction Reaction

Meng

Pei

et al. 2021

ACS Omega

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The stability and activity of the catalysts are crucial for the oxygen reduction reaction (ORR) in fuel cells. Herein, CoFe/N, S-codoped biomass carbon (FB-CoFe-700) with graphitic nanoribbons and multiple CoFe nanoparticles was prepared through a facile thermal pyrolysis followed by an acid treatment process. The evolution of the growth of metal nanoparticles with the formation of graphite during the carbonization process was investigated. Inseparable from graphitic carbon-encased metal nanoparticles with the coexistence of graphitized nanoribbons and graphene-like sheets, FB-CoFe-700 exhibited a remarkable long-term electrocatalytic stability with 90.7% current retention after 50 000 s much superior to that of the commercially available Pt/C (20 wt %) in an alkaline medium. Meanwhile, FB-CoFe-700 displayed promising ORR catalytic activity ( E 0 = 0.92 V vs reversible hydrogen electrode (RHE), E 1/2 = 0.82 V vs RHE, and n = 3.97) very similar to that of commercial Pt/C and outstanding methanol tolerance in an alkaline medium. This work is helpful for further development of nonprecious metal-doped carbon electrocatalysts with long-term stability.

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2-Methylimidazole as a nitrogen source assisted synthesis of a nano-rod-shaped Fe/FeN@N-C catalyst with plentiful FeN active sites and enhanced ORR activity

Cited by 55 publications

References 54 publications

Mesoporous N–P Codoped Carbon Nanosheets as Superior Cathodic Catalysts of Neutral Metal–Air Batteries

Mesoporous N–P Codoped Carbon Nanosheets as Superior Cathodic Catalysts of Neutral Metal–Air Batteries

Metal–Nitrogen–Carbon Catalysts of Specifically Coordinated Configurations toward Typical Electrochemical Redox Reactions

CoFe/N, S–C Featured with Graphitic Nanoribbons and Multiple CoFe Nanoparticles as Highly Stable and Efficient Electrocatalysts for the Oxygen Reduction Reaction

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