CoFe nanoalloy particles encapsulated in nitrogen-doped carbon layers as bifunctional oxygen catalyst derived from a Prussian blue analogue

Shang, Zhenxi; Chen, Zilong; Zhang, Zhenbao; Yu, Jing; Tan, Shaozao; Ciucci, Francesco; Shao, Zongping; Lei, Hao; Chen, Dengjie

doi:10.1016/j.jallcom.2018.01.019

Cited by 54 publications

(22 citation statements)

References 62 publications

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“…The Fe 50 Co 50 @N‐doped C catalysts derived from cellulose exhibit a comparable ORR activity in comparison to the previously reported electrocatalysts. Moreover, compared with the earlier reported FeCo alloys encapsulated in N‐doped carbon electrocatalysts, the ORR performance of Fe 50 Co 50 @N‐doped C catalysts is superior to CoFe@NC‐NCNT‐H catalysts ( E onset = −0.14 V vs Ag/AgCl) 54 and comparable to CNCo‐5@Fe‐2 ( E onset = −0.02 V vs Ag/AgCl) 68 and DBD‐FeCo@NC ( E onset = −0.01 V vs Ag/AgCl) 28 catalysts. In addition, the Fe 50 Co 50 alloys in the core covered with N‐doped carbon in the shell could be beneficial to durable ORR in the alkaline electrolytes.…”

Section: Resultsmentioning

confidence: 61%

“…For Fe 50 Co 50 @N‐doped C, three obvious diffraction peaks at 44.8°, 65.2° and 82.5° can be ascribed to the (110), (200) and (211) planes of the FeCo alloys (JCPDS No. 49‐1567) 54,55 . However , the intensities of diffraction peaks for FeCo alloys in the Fe 75 Co 25 @N‐doped C and Fe 25 Co 75 @N‐doped C are lower compared to Fe 50 Co 50 @N‐doped C. In addition, two peaks at around 44° can be found for Fe 25 Co 75 @N‐doped C, indicating the coexistence of metallic Co and FeCo alloy.…”

Section: Resultsmentioning

confidence: 96%

“…49-1567). 54,55 However , the intensities of diffraction peaks for FeCo alloys in the Fe 75 Co 25 @N-doped C and TEM images of Fe x Co 100-x @N-doped C (x = 0 − 100) are shown in Figure 2. The Fe x Co 100-x @N-doped C samples show that FeCo metal particles are retained and encapsulated in carbon nanoshells.…”

Section: Resultsmentioning

confidence: 99%

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Core‐shell FeCo N‐doped biocarbons as stable electrocatalysts for oxygen reduction reaction in fuel cells

Liu

Kuo

2020

Int J Energy Res

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A facile route is described for the synthesis of FeCo alloys encapsulated in the N-doped hierarchical carbon shells (denoted as Fe x Co 100-x @N-doped C) by using a combined hydrothermal carbonization of cellulose and NH 3 microwave ammoxidation. Various spectroscopic measurements are used to characterize the physicochemical properties of Fe x Co 100-x @N-doped C samples and their activity as well as stability in the oxygen reduction reaction (ORR) are investigated in alkaline electrolytes. The Fe x Co 100-x @N-doped C samples exhibit the core FeCo bimetals alloying with N (verified by X-ray absorption spectroscopy [XAS] and transmission electron microscopy) and N-doped onto highly porous carbons in the shell (proofed by N 2 adsorption-desorption isotherms and X-ray photoelectron spectroscopy [XPS]). Among the Fe x Co 100-x @N-doped C catalysts, the Fe 50 Co 50 @N-doped C with an atomic alloy ratio of FeCo (1:1) has a higher ORR performance (E onset = −0.05 V vs Ag/AgCl) and a surpassing durability (via a 4-electron ORR route) in comparison to other Fe x Co 100-x @N-doped C and commercial Pt/C catalysts. By XAS and XPS, the formation of Fe-N in the inner core and pyridinic-N on outer shell may be responsible for the superior ORR performance of Fe 50 Co 50 @Ndoped C catalysts. These biomass-derived carbon composites with unique coreshell FeCoN@N-doped porous carbon structure prepared by using a time and energy saving microwave-assisted method could offer a possible cathodic electrode in fuel cell applications.

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Section: Resultsmentioning

confidence: 61%

Section: Resultsmentioning

confidence: 96%

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Core‐shell FeCo N‐doped biocarbons as stable electrocatalysts for oxygen reduction reaction in fuel cells

Liu

Kuo

2020

Int J Energy Res

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“…Recently, Chen's group synthesized CoFe nanoalloy particles encapsulated in nitrogen doped carbon and nitrogen‐doped carbon nanotubes from PBA‐CoFe. As for the bifunctionality for both OER and ORR, an extremely low potential difference of ∼0.87 V between OER at 10.0 mA cm −2 and ORR at 3.0 mA cm −2 is achieved, superior to either commercial RuO 2 or Pt/C . Except carbides, metal‐carbon/nitrogen (M−C/N) composites and alloys, mixed oxides derived from PBA were also reported as effective bifunctional electrocatalysts for ORR and OER.…”

Section: Electrocatalysts Derived From Pb and Pbamentioning

confidence: 99%

Functional Electrocatalysts Derived from Prussian Blue and its Analogues for Metal‐Air Batteries: Progress and Prospects

Deng

Wang

2019

Batteries & Supercaps

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air batteries holding exceptionally high energy densities have been heavily explored recently amongst the promising next generation energy suppliers. However, their development for real application is restricted mainly due to the sluggish rates of the oxygen-reduction reaction (ORR) and oxygen-evolution reaction (OER) in the positive electrode. Thus, searching a facile way to attain highly efficient ORR and OER electrocatalysts are highly desirable. The key factors to improve the electrochemical performance of materials are to optimize their low-dimensional feature and adjust effective compositions. Prussian blue and its analogues (PB/PBAs) with open framework have attracted growing attention as hopeful precursors and templates to diverse transition metal-based materials and carbon hybrids for ORR and OER. Compared to other precursors, PB/PBAs are more feasible for large-scale application due to their easy preparation, low cost, tuneable compositions and great environmental friendliness. In this review, recent progresses in the utilization of PB/PBA to rationally design and synthesize complex composites with controlled morphologies, sizes, and compositions for ORR, OER and metal-air batteries are described in detail. Afterwards, a brief summary of the synthetic methods to complex transition metal-based compositions with nanostructures converted from PB/PBAs are provided. Lastly, the research challenges and possible development direction of open framework materials for metal-air batteries are outlined through analysing the merits and drawbacks of using PB/PBAs as precursors.

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“…Nanometals, namely metallic nanoparticles, [ 1–3 ] have become a rising star in the large family of thermal catalysts. [ 4–6 ] Compared with the traditional bulky metallic catalysts, the nanometal has a much smaller particle size and thus a much larger specific surface area, [ 7–9 ] which generates a great amount of active sites and better catalytic activities. [ 10–12 ] Also, the nanoscale particle size induces a transition of the composing atoms from metallic bonding toward individual atoms, [ 3,13,14 ] thereby increasing the concentration of dangling surface bonds and enhancing the intrinsic catalytic activities of nanometals.…”

Section: Introductionmentioning

confidence: 99%

Nanometal Thermocatalysts: Transformations, Deactivation, and Mitigation

Zhang

Pan

Zhou

et al. 2021

Small

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Nanometals have been proven to be efficient thermocatalysts in the last decades. Their enhanced catalytic activity and tunable functionalities make them intriguing candidates for a wide range of catalytic applications, such as gaseous reactions and compound synthesis/decomposition. On the other hand, the enhanced specific surface energy and reactivity of nanometals can lead to configuration transformation and thus catalytic deactivation during the synthesis and catalysis, which largely undermines the activity and service time, thereby calling for urgent research effort to understand the deactivating mechanisms and develop efficient mitigating methods. Herein, the recent progress in understanding the configuration transformation‐induced catalytic deactivation within nanometals is reviewed. The major pathways of configuration transformations, and their kinetics controlled by the environmental factors are presented. The approaches toward mitigating the transformation‐induced deactivation are also presented. Finally, a perspective on the future academic approaches toward in‐depth understanding of the kinetics of the deactivation of nanometals is proposed.

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CoFe nanoalloy particles encapsulated in nitrogen-doped carbon layers as bifunctional oxygen catalyst derived from a Prussian blue analogue

Cited by 54 publications

References 62 publications

Core‐shell FeCo N‐doped biocarbons as stable electrocatalysts for oxygen reduction reaction in fuel cells

Core‐shell FeCo N‐doped biocarbons as stable electrocatalysts for oxygen reduction reaction in fuel cells

Functional Electrocatalysts Derived from Prussian Blue and its Analogues for Metal‐Air Batteries: Progress and Prospects

Nanometal Thermocatalysts: Transformations, Deactivation, and Mitigation

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