A highly active and durable iron/cobalt alloy catalyst encapsulated in N-doped graphitic carbon nanotubes for oxygen reduction reaction by a nanofibrous dicyandiamide template

An, Li; Jiang, Ning; Li, Biao; Hua, Shixin; Fu, Yutong; Liu, Jiaxi; Wei, Hao; Xia, Dingguo; Sun, Zaicheng

doi:10.1039/c8ta01247d

Cited by 84 publications

(48 citation statements)

References 64 publications

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“…40 % higher diffusion-limited current density than the Pt/C catalyst (20 μg Pt cm À 2 ) at 1600 rpm in 0.1 M KOH. [51] In this work, the limiting current density of the Co/IL-PAN-A800 electrode was also higher compared to that of commercial Pt/C at 1900 rpm in 0.1 M KOH (see Table 4 and Figure 5c). In general, the E onset is more positive for Fe containing CNF catalysts compared to their Co counterparts as also previously reported in the literature for different TM and N co-doped carbon nanomaterials.…”

Section: Catalyst Materialssupporting

confidence: 49%

“…A similar electrochemical O 2 reduction behaviour was observed by An et al in the case of FeCo alloy catalyst encapsulated in N-doped graphitic carbon nanotubes (FeCo@N-GCNT-FD), which was prepared via pyrolysis of Co and Fe salts and nanofibrous dicyandiamide. [51] The FeCo@N-GCNT-FD catalyst showed the Figure 5b. [b] Data derived from the RDE polarisation curves presented in Figure 5c. E onset value of 0.96 V and ca.…”

Section: Catalyst Materialsmentioning

confidence: 99%

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Electrospun Polyacrylonitrile‐Derived Co or Fe Containing Nanofibre Catalysts for Oxygen Reduction Reaction at the Alkaline Membrane Fuel Cell Cathode

et al. 2020

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Electrospun polyacrylonitrile (PAN) based carbon nanofibres (CNF) are employed as cathode catalysts in anion-exchange membrane fuel cell (AEMFC) for the first time. The catalysts are prepared via pyrolysis of Co or Fe salt-containing PAN fibre with and without the ionic liquid (IL) additive. The catalyst material preparation is optimised by assessing the oxygen reduction reaction (ORR) activity of different transition metal and nitrogen-doped CNFs in 0.1 M KOH by rotating disc electrode method followed by testing in real AEMFC configuration. The best performance in the AEMFC is observed in case of Fe and IL containing PAN fibre that was pyrolysed at 1000°C and additionally treated in an acid solution (Fe/IL-PAN-A1000). In the AEMFC, the Fe/IL-PAN-A1000 catalyst showed the maximum power density (P max) of 289 mW cm À 2 , which is 82 % of the P max obtained with commercial Pt/C cathode catalyst (352 mW cm À 2).

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Section: Catalyst Materialssupporting

confidence: 49%

Section: Catalyst Materialsmentioning

confidence: 99%

Electrospun Polyacrylonitrile‐Derived Co or Fe Containing Nanofibre Catalysts for Oxygen Reduction Reaction at the Alkaline Membrane Fuel Cell Cathode

et al. 2020

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“…at 712.2 and 734.7 eV corresponds to the Fe atoms with high oxidation state, i. e. Fe−N species . The peaks at 707 and 720.4 eV in the same spectrum matches well with the zero‐valent metallic Fe in the FeCo alloy NPs . Similarly, Co 2p also exhibits not only metallic but also ionic peaks as shown in the Figure d.…”

Section: Resultssupporting

confidence: 62%

“…[43] The peaks at 707 and 720.4 eV in the same spectrum matches well with the zero-valent metallic Fe in the FeCo alloy NPs. [44] Similarly, Co 2p also exhibits not only metallic but also ionic peaks as shown in the Figure 3d. A significant peak area for the zero-valent Co centered at 778.3 and 793.1 eV means that most of the Co is in metallic state, thus, further verifying the successful FeCo alloy formation.…”

Section: Resultsmentioning

confidence: 84%

A Facile Synthesis of FeCo Nanoparticles Encapsulated in Hierarchical N‐Doped Carbon Nanotube/Nanofiber Hybrids for Overall Water Splitting

et al. 2019

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Development of efficient and cost-effective transition metalbased catalysts for overall water splitting is desired. Herein, a facile synthesis procedure for the development of FeCo bimetallic alloy nanoparticles (NPs) located on the tips of multiwalled carbon nanotubes (CNTs) supported over N-doped carbon nanofibers (CNFs) is presented. The CNTs, not only prevent FeCo NPs from agglomeration by encapsulating them at the tip but also provide an efficient electron pathway. The materials exhibited excellent performance in oxygen evolution reaction (OER) and decent activity in hydrogen evolution reaction (HER) with long-term durability of up to 48 hours on glassy carbon electrode. The best OER activity with a overpotential of 283 mV@10 mAcm À 2 and Tafel slope of 38 mV/dec was achieved with a hierarchically porous catalyst having Fe : Co molar ratio of 1 : 2. This synthesis approach is promising for growing well-dispersed CNTs over N-doped carbonaceous support using bimetallic alloys for electrocatalytic applications.catalyst's intrinsic resistance and facilitating the charge transfer between catalyst and the electrolyte interface. This work might introduce a new and cost effective way for the homogenously distributed in-situ growth of CNTs over N doped carbonaceous support that have potential applications as electrocatalyst in metal air batteries, water splitting and fuel cells.

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“…where Vb is the scan rate ( Figure S1). The electrochemically active surface areas (ECSA) are calculated by ECSA=C dl /Cs, of which C s is the specific capacitance of a flat surface with 1 cm 2 of surface area, and the rugosity can be estimated from ECSA/geometric surface area (0.1256 cm 2 ) [48,49]. The calculated C dl values of A/Co, Q/Co, and Q-A/Co were 14 mF/cm 2 , 14 mF/cm 2 , and 11 mF/cm 2 , respectively.…”

Section: Electrochemical Properties Of Co Nanoparticles/n-doped Carbomentioning

confidence: 99%

Cobalt Nanoparticles on Plasma-Controlled Nitrogen-Doped Carbon as High-Performance ORR Electrocatalyst for Primary Zn-Air Battery

Kim

Hyun

2020

Nanomaterials

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Metal–air batteries and fuel cells have attracted much attention as powerful candidates for a renewable energy conversion system for the last few decades. However, the high cost and low durability of platinum-based catalysts used to enhance sluggish oxygen reduction reaction (ORR) at air electrodes prevents its wide application to industry. In this work, we applied a plasma process to synthesize cobalt nanoparticles catalysts on nitrogen-doped carbon support with controllable quaternary-N and amino-N structure. In the electrochemical test, the quaternary-N and amino-N-doped carbon (Q-A)/Co catalyst with dominant quaternary-N and amino-N showed the best onset potential (0.87 V vs. RHE) and highest limiting current density (−6.39 mA/cm2). Moreover, Q-A/Co was employed as the air catalyst of a primary zinc–air battery with comparable peak power density to a commercial 20 wt.% Pt/C catalyst with the same loading, as well as a stable galvanostatic discharge at −20 mA/cm2 for over 30,000 s. With this result, we proposed the synergetic effect of transitional metal nanoparticles with controllable nitrogen-bonding can improve the catalytic activity of the catalyst, which provides a new strategy to develop a Pt-free ORR electrocatalyst.

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A highly active and durable iron/cobalt alloy catalyst encapsulated in N-doped graphitic carbon nanotubes for oxygen reduction reaction by a nanofibrous dicyandiamide template

Abstract: The FeCo@N-GCNT-FD catalyst exhibits enhanced intrinsic activities and excellent durability for the oxygen reduction reaction.

Cited by 84 publications

References 64 publications

Electrospun Polyacrylonitrile‐Derived Co or Fe Containing Nanofibre Catalysts for Oxygen Reduction Reaction at the Alkaline Membrane Fuel Cell Cathode

Electrospun Polyacrylonitrile‐Derived Co or Fe Containing Nanofibre Catalysts for Oxygen Reduction Reaction at the Alkaline Membrane Fuel Cell Cathode

A Facile Synthesis of FeCo Nanoparticles Encapsulated in Hierarchical N‐Doped Carbon Nanotube/Nanofiber Hybrids for Overall Water Splitting

Cobalt Nanoparticles on Plasma-Controlled Nitrogen-Doped Carbon as High-Performance ORR Electrocatalyst for Primary Zn-Air Battery

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