Synergistic CoFe-Fe5C2 nanocrystal wrapped in N-doped carbon/carbon nanotubes as enhanced and CO-resistant electrocatalyst for methanol oxidation

Song, Zixiang; Zhang, Mingmei; Wang, Zhuokai; Huang, Zhiye; Wang, An; Zhu, Guisheng; Shao, Shouyan

doi:10.1016/j.apcata.2021.118383

Cited by 6 publications

(3 citation statements)

References 37 publications

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“…2a). The NCNTs have shown higher graphitization degree and minor diameter compared with the carbon sticks, which is contributed to the further catalysis process [34] (Fig. 2b).…”

Section: Resultsmentioning

confidence: 99%

The electron modulation effect on metal nanoclusters of Fe-N-C based bifunctional electrocatalysts

Chen

Liu

Xue

et al. 2023

Preprint

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With the development of the single-atom catalysts in electrocatalysis, the existence of metal nanoclusters in metal-N-C based materials have been proved. However, the effect of metal nanoclusters on electrocatalysis is hard to be confirmed. Herein, a novel framework of NCNTs with Fe nanoclusters and Fe-N-C sites (Fe3C-NCNTs 90min/CC) have been synthesized as the platform confirmed by Cs-corrected TEM and HADDF-STEM. Compared the samples immersed in HCl to remove Fe nanoclusters (HCl-Fe3C-NCNTs 90min/CC), the composite exhibits strong polarization and electron modulation effect onside the surface of NCNTs confirmed by holography. The electrocatalytic performance of Fe3C-NCNTs 90min/CC reduced significantly after the acid-treatment with a half-wave potential of 0.88 to 0.78V for ORR and an overpotential of 380mV to 510mV at 10mA cm− 2 for OER in alkaline solution. Furthermore, such a bifunctional catalyst endows the homemade ZAB with high power density and long-term stability, outperforming commercial Pt/C-RuO2 catalysts. The density functional theory (DFT) calculation indicates that the multiatom Fe-N-C sites significantly accelerate the desorption of OH* intermediates and thus promote the ORR process. This work paves a facile route to design the cluster-modulated interactions towards electrocatalysts and reveals the roles and effects on the metal nanoclusters for ORR/OER performance.

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“…2a). The NCNTs have shown higher graphitization degree and minor diameter compared with the carbon sticks, which is contributed to the further catalysis process [34] (Fig. 2b).…”

Section: Resultsmentioning

confidence: 99%

The electron modulation effect on metal nanoclusters of Fe-N-C based bifunctional electrocatalysts

Chen

Liu

Xue

et al. 2023

Preprint

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“…[31] With the calcination time further prolonged to 90 min, the sticks have totally changed to NCNTs with a thickness of 50-100 nm of the carbon nanotube wall. The NCNTs have shown higher graphitization degree and minor diameter compared with the carbon sticks, which contributed to the further catalysis process [32] (Figure 1c). All the results mentioned above confirm the successful synthesis of the NCNTs-based catalysts.…”

Section: Resultsmentioning

confidence: 99%

Exceptionally Bifunctional ORR/OER Performance via Synergistic Atom–Cluster Interaction

Chen,

Liu,

Xue

et al. 2023

Small

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The single‐atom sites (SAs) have achieved enhanced performance toward oxygen reduction reaction (ORR) with the effective utilization of the active sites. However, the excess adsorption of the intermediates and the limited stability hinders performance improvement. Metal clusters with promising stability and weak adsorption can be used as potential substitutions, but the lack of active sites is considered undesirable for catalytic reactions. Herein, a framework of Fe nanoclusters combined with SAs on One dimensional (1D) carbon nanotubes (Fe3C‐NCNTs 90 min CC−1) is synthesized to confirm the synergistic atom–cluster interaction. The composite exhibits strong polarization and electron redistribution between nanocluster and SAs. The electron redistribution will significantly boost the electron transport and the desorption of the intermediates, which is confirmed by off‐axis holography and DFT calculation. The electrocatalytic performance is significantly enhanced as the half‐wave potential of ORR increased 75 mV and the potential of OER increased 133 mV compared with the sample without nanoclusters. Furthermore, such a bifunctional catalyst endows homemade Zn‐air batteries (ZABs) with high power density and long‐term stability. This work paves a facile route to design bifunctional ORR/OER electrocatalysts consisting of 0D composite structures.

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“…This modication could potentially reduce the adsorption of reaction intermediates on the electrocatalyst surface, thereby enhancing the electrocatalytic ability of Pt. 42 The lower binding energies and increased amount of Pt 0 species with higher pyrolysis temperatures indicate the importance of desorbing poisoned intermediates from the Pt surface and the growth of Pt catalytic centres in the MOR process. 43 The XPS spectra of C 1s displayed peaks at 283.7 eV and 284.3 eV, corresponding to C] C and C-C bonds (Fig.…”

Section: Xps Analysismentioning

confidence: 99%

MnO–Co@Pt nanowires encapsulated in N-doped porous carbon derived from MOFs for efficient electrocatalytic methanol oxidation reaction

Askarov,

Ren,

Wang

et al. 2023

J. Mater. Chem. A

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Synergistic CoFe-Fe5C2 nanocrystal wrapped in N-doped carbon/carbon nanotubes as enhanced and CO-resistant electrocatalyst for methanol oxidation

Cited by 6 publications

References 37 publications

The electron modulation effect on metal nanoclusters of Fe-N-C based bifunctional electrocatalysts

The electron modulation effect on metal nanoclusters of Fe-N-C based bifunctional electrocatalysts

Exceptionally Bifunctional ORR/OER Performance via Synergistic Atom–Cluster Interaction

MnO–Co@Pt nanowires encapsulated in N-doped porous carbon derived from MOFs for efficient electrocatalytic methanol oxidation reaction

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