Fe nanoparticles encapsulated in doped graphitic shells as high-performance and stable catalysts for oxygen reduction reaction in an acid medium

Park, Hyun-Suk; Han, Sang-Beom; Kwak, Da-Hee; Han, Jae‐Hee; Park, Kyung-Won

doi:10.1016/j.jcat.2018.12.015

Cited by 34 publications

(11 citation statements)

References 43 publications

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“…21,22,25 Only a few studies have reported the preparation of S-doped Fe@C nanocomposites. 33,34 For example, Park et al 34 recently reported the synthesis of an ORR catalyst with Fe nanoparticles encapsulated in a N,S-codoped graphitic shell (Fe@ NSC) using a prereduction and two-step heating process, that is, prereduction of Fe salts and subsequent high-temperature treatment of Fe nanoparticles on N-doped carbon and N/S/C precursors. They then found that the introduction of sulfur species into the Fe@NC led to enhanced ORR activity and stability, with a negative shift of the half-wave potential (E 1/2 ) by only 41 mV after 10,000 potential cycles.…”

Section: Introductionmentioning

confidence: 99%

Iron Nanoparticles Encapsulated in S,N-Codoped Carbon: Sulfur Doping Enriches Surface Electron Density and Enhances Electrocatalytic Activity toward Oxygen Reduction

Chen

Yan

Hao

et al. 2020

ACS Appl. Mater. Interfaces

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Development of highly efficient nonprecious metal (NPM) catalysts for oxygen reduction reaction (ORR) in acidic media is challenging but of great significance. Herein, an effective ORR catalyst based on Fe nanoparticles encapsulated by S,Ncodoped few-layer defective carbon (Fe@S,N-DC) was synthesized via a microwave-assisted strategy. The obtained Fe@S,N-DC nanocomposite showed a remarkable electrocatalytic activity toward ORR in acidic media, with a half-wave potential (E 1/2 ) of +0.785 V versus reversible hydrogen electrode, which was 80 mV more positive than that of the sulfur-free counterpart (Fe@N-DC). Furthermore, due to the protection by the S,N-codoped carbon shell, the Fe@S,N-DC nanocomposite displayed apparent stability with only a 13 mV negative shift of E 1/2 after 10,000 cycles and excellent tolerance to methanol. X-ray absorption near-edge spectroscopy measurements confirmed the formation of multiple defective sites on the S,N-codoped carbon surface and strong interfacial electron transfer from the Fe core to the outer carbon surface, as compared to the sulfur-free counterpart. The enriched electron density on the defective carbon surface of Fe@S,N-DC, induced by the interfacial electron transfer, facilitated the reduction of O 2 to OOH*, leading to enhanced ORR performance. These results shed light on the significance of S doping in Fe−N−C catalysts in the design of high-performance NPM catalysts for ORR in acidic media.

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Section: Introductionmentioning

confidence: 99%

Iron Nanoparticles Encapsulated in S,N-Codoped Carbon: Sulfur Doping Enriches Surface Electron Density and Enhances Electrocatalytic Activity toward Oxygen Reduction

Chen

Yan

Hao

et al. 2020

ACS Appl. Mater. Interfaces

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“…The catalyst exhibited a more positive half-wave potential in alkaline medium and almost the same half-wave potential in acidic electrolyte, when compared with the commercial Pt/C catalyst. Park et al [38] wrapped graphite on nanotubes and improved the performance of the catalyst by the introduction of heteroatoms, which exhibit high catalytic activity and good stability in both acidic and alkaline media. Besides, Zhong et al [39] introduced MOF (MIL-88B-NH 3 ) nanocrystals into the poly(acrylonitrile) fibers by electrospinning and created rich hierarchical pores and well-dispersed Fe 3 C NPs in the catalyst, which improved its ORR catalytic performance and cycling stability in acidic electrolyte.…”

Section: Introductionmentioning

confidence: 99%

Superior Fe_xN electrocatalyst derived from 1,1′-diacetylferrocene for oxygen reduction reaction in alkaline and acidic media

Jiang

Liang

et al. 2020

Nanotechnology Reviews

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Although Fe–N/C catalysts have received increasing attention in recent years for oxygen reduction reaction (ORR), it is still challenging to precisely control the active sites during the preparation. Herein, we report FexN@RGO catalysts with the size of 2–6 nm derived from the pyrolysis of graphene oxide and 1,1′-diacetylferrocene as C and Fe precursors under the NH3/Ar atmosphere as N source. The 1,1′-diacetylferrocene transforms to Fe3O4 at 600°C and transforms to Fe3N and Fe2N at 700°C and 800°C, respectively. The as-prepared FexN@RGO catalysts exhibited superior electrocatalytic activities in acidic and alkaline media compared with the commercial 10% Pt/C, in terms of electrochemical surface area, onset potential, half-wave potential, number of electrons transferred, kinetic current density, and exchange current density. In addition, the stability of FGN-8 also outperformed commercial 10% Pt/C after 10000 cycles, which demonstrates the as-prepared FexN@RGO as durable and active ORR catalysts in acidic media.

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“…[21] The XRD patterns of the final samples of Co-NOPC andC o-NC are showni nF igure 3b.T he diffraction peaks at approximately 23.3 and 43.58 can be assigned to the (0 02)a nd (1 00)p lanes of the graphite structure. [22] Moreover,t here are no significant metal peaks in the XRD pattern, which indicates that no metal nanoparticles were formed after annealing at 500 8C. The XRD patterns of catalysts synthesized at different temperaturesa re compared in Figure S4 in the Supporting Information.…”

Section: Resultsmentioning

confidence: 98%

Rational Design of Hierarchical, Porous, Co‐Supported, N‐Doped Carbon Architectures as Electrocatalyst for Oxygen Reduction

et al. 2020

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Developing highly active nonprecious‐metal catalysts for the oxygen reduction reaction (ORR) is of great significance for reducing the cost of fuel cells. 3D‐ordered porous structures could substantially improve the performance of the catalysts because of their excellent mass‐diffusion properties and high specific surface areas. Herein, ordered porous ZIF‐67 was prepared by forced molding of a polystyrene template, and Co‐supported, N‐doped, 3D‐ordered porous carbon (Co‐NOPC) was obtained after further carbonization. Co‐NOPC exhibited excellent performance for the ORR in an alkaline medium with a half‐wave potential of 0.86 V vs. reversible hydrogen electrode (RHE), which is higher than that of the state‐of‐the‐art Pt/C (0.85 V vs. RHE). Moreover, the substantially improved catalytic performance of Co‐NOPC compared with Co‐supported, N‐doped carbon revealed the key role of its hierarchical porosity in boosting the ORR. Co‐NOPC also exhibited a close‐to‐ideal four‐electron transfer path, long‐term durability, and resistance to methanol penetration, which make it promising for large‐scale application.

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Fe nanoparticles encapsulated in doped graphitic shells as high-performance and stable catalysts for oxygen reduction reaction in an acid medium

Cited by 34 publications

References 43 publications

Iron Nanoparticles Encapsulated in S,N-Codoped Carbon: Sulfur Doping Enriches Surface Electron Density and Enhances Electrocatalytic Activity toward Oxygen Reduction

Iron Nanoparticles Encapsulated in S,N-Codoped Carbon: Sulfur Doping Enriches Surface Electron Density and Enhances Electrocatalytic Activity toward Oxygen Reduction

Superior Fe_xN electrocatalyst derived from 1,1′-diacetylferrocene for oxygen reduction reaction in alkaline and acidic media

Rational Design of Hierarchical, Porous, Co‐Supported, N‐Doped Carbon Architectures as Electrocatalyst for Oxygen Reduction

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Fe nanoparticles encapsulated in doped graphitic shells as high-performance and stable catalysts for oxygen reduction reaction in an acid medium

Cited by 34 publications

References 43 publications

Iron Nanoparticles Encapsulated in S,N-Codoped Carbon: Sulfur Doping Enriches Surface Electron Density and Enhances Electrocatalytic Activity toward Oxygen Reduction

Iron Nanoparticles Encapsulated in S,N-Codoped Carbon: Sulfur Doping Enriches Surface Electron Density and Enhances Electrocatalytic Activity toward Oxygen Reduction

Superior Fe x N electrocatalyst derived from 1,1′-diacetylferrocene for oxygen reduction reaction in alkaline and acidic media

Rational Design of Hierarchical, Porous, Co‐Supported, N‐Doped Carbon Architectures as Electrocatalyst for Oxygen Reduction

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Superior Fe_xN electrocatalyst derived from 1,1′-diacetylferrocene for oxygen reduction reaction in alkaline and acidic media