Iron Carbide Nanoparticles Encapsulated in Mesoporous Fe‐N‐Doped Carbon Nanofibers for Efficient Electrocatalysis

Wu, Zhenyu; Xu, Xingxing; Hu, Bingbing; Liang, Hai‐Wei; Lin, Yue; Chen, Lifeng; Yu, Shu‐Hong

doi:10.1002/anie.201502173

Cited by 551 publications

(265 citation statements)

References 47 publications

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“…Moreover, the specific capacity of Fe-N-CNFs-based battery was 614 mA h g -1 (normalized to the mass of consumed Zn) at the discharge density of 10 mA cm -2 , corresponding to a high gravimetric energy density of ≈760 W h kg -1 . [73] The values are highly comparable with that of Pt/C-based Zn-O 2 battery. The excellent performance is probably due to a synergetic catalytic effect of Fe-N x and encapsulated Fe 3 C nanoparticles within the 3D CNFs.…”

Section: Metal-o 2 Batteriessupporting

confidence: 60%

“…For example, the as-synthesized Fe 3 C nanoparticles encapsulated in mesoporous Fe-N-CNFs were used as the electrocatalyst in Zn-O 2 battery. [73] The electrocatalyst exhibits an excellent ORR activity with an onset potential of -0.02 V, half-wave potential of -0.140 V (highly comparable to the state-of-the-art Pt/C catalyst in alkaline media), and good ORR activity in acidic media, which is nearly the best electrocatalyst among the previously reported activities of nonprecious metal catalysts. The as-assembled Zn-O 2 battery exhibits a high voltage of 1.30 and 1.21 V at the discharge current density of 1.0 and 10 mA cm -2 , respectively (Figure 16).…”

Section: Metal-o 2 Batteriesmentioning

confidence: 73%

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Macroscopic‐Scale Three‐Dimensional Carbon Nanofiber Architectures for Electrochemical Energy Storage Devices

Chen

Feng

Liang

et al. 2017

Advanced Energy Materials

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158

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Therefore, it is necessary to develop highperformance energy storage devices for facilitating the effective utilization of intermittent renewable energy sources. [7][8][9] Among varieties of electrochemical energy storage devices, supercapacitors (known as electrochemical capacitors) [10,11] and some rechargeable batteries (lithium-ion batteries (LIBs), lithiumsulfur (Li-S) batteries, and metal-O 2 batteries) [12][13][14][15] are at the frontier, because they can transport high power and store high energy. Nowadays, they play an indispensable role in our daily life by powering numerous portable electronic devices (e.g., cell phones and laptops), hybrid electric vehicles, and large-scale electrical grids. [16][17][18][19] It is well accepted that the performance of energy storage devices mainly depended on their electrode materials. [20,21] Owing to the advantages of large surface area, light weight, good electrical conductivity, and high thermal/ chemical stability, carbon materials have been considered as the most important electrode materials of supercapacitors and rechargeable batteries [8,20,21] Hence, various nanostructured carbons, such as carbon/graphene quantum dots, [22,23] carbon nanofiber (CNFs), [16,24] carbon nanotubes (CNTs), [13,25] graphene [26][27][28][29][30][31][32] carbon nanosheets, [33,34] 3D carbon nanostructures, [35][36][37] and porous carbon, [38,39] have gained great attention. Among these materials, 3D carbon nanomaterials have some advantages. The interlinked architecture not only shortens transport distances for ions in the well-interconnected wall structure, but also provides a continuous pathway endowing for the fast electron transport. [40] Moreover, the structural interconnectivities guarantee higher electrical conductivity and better mechanical stability. [36,41] Thereby, the design and fabrication of various 3D carbonbased nanostructures, including carbon nanotube networks, graphene gels, graphene foams, and 3D CNFs, have been intensively investigated.Over the past few years, there are many reviews summarizing the progress of fabricating 3D carbon-based nanomaterials. For example, Schneider et al. overviewed the recent advance in the synthesis of 3D arranged carbon nanotube architectures. [42] Li et al. reviewed the carbon-based 3D nanostructures for supercapacitors. [36] Cao and Gui et al. comprehensively reviewed the recent progress in synthesis, properties, and energy applications of CNT sponges, aerogels, and hierarchical composites. [43] The development of high-performance electrochemical energy storage devices is critical for addressing energy crises and environmental pollution.

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Section: Metal-o 2 Batteriessupporting

confidence: 60%

Section: Metal-o 2 Batteriesmentioning

confidence: 73%

Macroscopic‐Scale Three‐Dimensional Carbon Nanofiber Architectures for Electrochemical Energy Storage Devices

Chen

Feng

Liang

et al. 2017

Advanced Energy Materials

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158

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“…However, the high cost, poor stability and low abundance of platinum limit the widespread use of Pt-based catalysts. Notable progress has been made in recent years in the development of low-cost noble-metal-free catalysts, including heteroatom-doped carbon materials, 4-6 Fe 3 C-based materials [7][8][9] and transition-metalcoordinated nitrogen-doped carbon catalysts (Me-N-C, Me: Fe and/ or Co). [10][11][12] Although these materials demonstrate desirable ORR catalytic activity comparable to that of Pt/C in an alkaline medium, only Me-N-C catalysts, particularly Fe-N-C, show relatively good catalytic activity and durability in acidic conditions, [13][14][15] which makes them attractive for use in proton exchange membrane fuel cells.…”

Section: Introductionmentioning

confidence: 99%

N-doped carbon nanotubes containing a high concentration of single iron atoms for efficient oxygen reduction

et al. 2018

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Fe-N-C has emerged as a promising noble-metal-free catalyst for the oxygen reduction reaction (ORR). However, achieving a catalytic activity comparable to that of Pt in acidic medium remains a great challenge. Here we report a N-doped carbon nanotube (CNT) catalyst in which a high concentration of single Fe atoms has been dispersed (CNT@Fe-N-PC). The catalyst was prepared by a simple and scalable atomic isolation method, in which a metal isolation agent was introduced to isolate Fe atoms and was then evaporated to produce abundant micropores that host single Fe atom active sites. The CNT@Fe-N-PC catalyst contained a high concentration of single Fe atom active sites and exhibited ultrahigh ORR activity with a half-wave potential of 0.82 V, comparable to that of Pt/C in an acidic medium. A high concentration of Fe-N x active sites was created on a flexible single-wall CNT film and carbon cloth using this technique, and these materials showed even better ORR performance, that is, 40-60 mV more positive onset potentials than those of a commercial Pt/C catalyst. These catalysts exhibit excellent catalytic activity, good durability and low cost, and show great potential for commercial use as substitutes for current Pt-based catalysts.

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“…Another issue is that the Pt-based electrocatalysts are vulnerable to the fuel crossover effect and poisoning by the adsorption of reaction intermediates, which restricts their tolerance performance [16,17]. Consequently, an amount of alternative non-precious catalysts have been explored to facilitate the ORR performance and replace Pt-based materials [18,19].…”

Section: Introductionmentioning

confidence: 99%

Encapsulated MnO in N-doping carbon nanofibers as efficient ORR electrocatalysts

et al. 2017

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Development of cheap, abundant and noblemetal-free materials as high efficient oxygen reduction electrocatalysts is crucial for future energy storage system. Here, one-dimensional (1D) MnO N-doped carbon nanofibers (MnO-NCNFs) were successfully developed by electrospinning combined with high temperature pyrolysis. The MnO-NCNFs exhibit promising electrochemical performance, methanol tolerance, and durability in alkaline medium. The outstanding electrocatalytic activity is mainly attributed to several issues. First of all, the uniform 1D fiber structure and the conductive network could facilitate the electron transport. Besides, the introduction of Mn into the precursor can catalyze the transformation of amorphous carbon to graphite carbon, while the improved graphitization means better conductivity, beneficial for the enhancement of catalytic activity for oxygen reduction reaction (ORR). Furthermore, the porous structure and high surface area can effectively decrease the mass transport resistance and increase the exposed ORR active sites, thus improve utilization efficiency and raise the quantity of exposed ORR active sites. The synergistic effect of MnO and NCNFs matrix, which enhances charge transfer, adsorbent transport, and delivers efficiency in the electrolyte solution, ensures the high ORR performance of MnO-NCNFs.

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Iron Carbide Nanoparticles Encapsulated in Mesoporous Fe‐N‐Doped Carbon Nanofibers for Efficient Electrocatalysis

Cited by 551 publications

References 47 publications

Macroscopic‐Scale Three‐Dimensional Carbon Nanofiber Architectures for Electrochemical Energy Storage Devices

Macroscopic‐Scale Three‐Dimensional Carbon Nanofiber Architectures for Electrochemical Energy Storage Devices

N-doped carbon nanotubes containing a high concentration of single iron atoms for efficient oxygen reduction

Encapsulated MnO in N-doping carbon nanofibers as efficient ORR electrocatalysts

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