Defect-enriched carbon nanofibers encapsulating NiCo oxide for efficient oxygen electrocatalysis and rechargeable Zn-air batteries

Liu, Chaojun; Zuo, Pengjian; Jin, Yingmin; Zong, Xin; Li, Dong; Xiong, Yueping

doi:10.1016/j.jpowsour.2020.228604

Cited by 29 publications

(15 citation statements)

References 53 publications

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“…For Ni x Co y -ZIFs/PAN-Ar, the XRD pattern showed the diffraction peaks of two main metallic elements at 44.5° and 51.8°, which proved that Ni x Co y alloy metal doping was realized [ 33 ]. Examining Ni x Co y -ZIFs/PAN-Air, the XRD pattern revealed diffraction peaks of multiple metal oxides at 36.8°, 44.3°,59.8°, and 65.0°, indicating Ni x Co y metal oxides doping was achieved [ 34 , 35 ]. Moreover, the XRD patterns of Ni x Co y -ZIFs/PAN-H 2 S offered Ni x Co y metallic sulfide diffraction peaks at 30.8°, 35.1°, 47.2°, and 54.7°, which affirmed multiple metallic sulfide doping.…”

Section: Resultsmentioning

confidence: 99%

Preparation and Characterization of Multi-Doped Porous Carbon Nanofibers from Carbonization in Different Atmospheres and Their Oxygen Electrocatalytic Properties Research

et al. 2022

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Recently, electrocatalysts for oxygen reduction reaction (ORR) as well as oxygen evolution reaction (OER) hinged on electrospun nanofiber composites have attracted wide research attention. Transition metal elements and heteroatomic doping are important methods used to enhance their catalytic performances. Lately, the construction of electrocatalysts based on metal-organic framework (MOF) electrospun nanofibers has become a research hotspot. In this work, nickel-cobalt zeolitic imidazolate frameworks with different molar ratios (NixCoy-ZIFs) were synthesized in an aqueous solution, followed by NixCoy-ZIFs/polyacrylonitrile (PAN) electrospun nanofiber precursors, which were prepared by a simple electrospinning method. Bimetal (Ni-Co) porous carbon nanofiber catalysts doped with nitrogen, oxygen, and sulfur elements were obtained at high-temperature carbonization treatment in different atmospheres (argon (Ar), Air, and hydrogen sulfide (H2S)), respectively. The morphological properties, structures, and composition were characterized by scanning electron microscopy (SEM), transmission electron microscopy (TEM), selected area electron diffraction (SAED), X-ray diffraction (XRD), and X-ray photoelectron spectroscopy (XPS). Moreover, the specific surface area of materials and their pore size distribution was characterized by Brunauer-Emmett-Teller (BET). Linear sweep voltammetry curves investigated catalyst performances towards oxygen reduction and evolution reactions. Importantly, Ni1Co2-ZIFs/PAN-Ar yielded the best ORR activity, whereas Ni1Co1-ZIFs/PAN-Air exhibited the best OER performance. This work provides significant guidance for the preparation and characterization of multi-doped porous carbon nanofibers carbonized in different atmospheres.

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Section: Resultsmentioning

confidence: 99%

Preparation and Characterization of Multi-Doped Porous Carbon Nanofibers from Carbonization in Different Atmospheres and Their Oxygen Electrocatalytic Properties Research

et al. 2022

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“…In addition, the peak at 787.0 eV is assigned to the shake‐up satellite peak (Sat). [ 35 ] The Co 2 p 3/2 XPS spectrum of NiCo/CF‐600 shows no Co 0 peak due to the incomplete alloying of metals caused by low temperature. In contrast, the NiCo/CF‐800 and NiCo/CF‐900 catalysts exhibit higher ratios of the Co 0 peak area.…”

Section: Resultsmentioning

confidence: 99%

Thermal Engineering of NiCo‐Codoped Carbon Nanofibers toward Enhanced Oxygen Electrocatalysis for Zn–Air Batteries

et al. 2021

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Electrospinning is an efficient and facile method to prepare carbon nanofibers (CFs) embedded with a NiCo alloy as efficient oxygen electrocatalysts for Zn–air batteries. The subsequent pyrolysis of electrospun‐woven is significant to the crystallization degree of CFs and NiCo alloy. Herein, the effect of the crystallization degree of the alloy and carbon on the oxygen electrocatalytic activity is explored through controlled thermal engineering (the annealing temperature). As the temperature increases, the degree of crystallization and agglomeration of nanoparticles increases simultaneously, accompanied by the increase of the graphitization degree of CFs. Among all the samples, NiCo/CF‐800 exhibits the best oxygen bifunctional catalytic activity (ΔE = 0.73 V). A Zn–air battery based on the NiCo/CF‐800 catalyst exhibits a high peak power density (168.6 mW cm−2), high specific capacity (802.6 mA h gZn−1), and excellent charge/discharge cycling stability. This work provides new insight into catalysts through thermal engineering, promoting the practical application of electrospinning as a large‐scale production method.

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“…Electrospinning technology has been widely utilized for synthesizing 3D networks woven by functionalized carbon nanofibers (CFs) possessing various hierarchically porous structures and large specific surface areas. − Nevertheless, to date, no effort has been made to design Fe/Mn bimetal functionalized and B and N codoped hierarchically porous CFs using the electrospinning technology for boosting the HER/ORR catalytic efficiencies. In this article, for the first time, we successfully designed novel 3D hybrid networks consisting of manganese oxide (MnO)-modified, iron carbide (Fe 3 C)@C-embedded, and B and N codoped porous CFs (denoted FeMn@BNPCFs- T , where T represents the pyrolysis temperatures utilized for carbonizing the precursor networks) that can act as efficient HER and ORR electrocatalysts in alkaline solutions.…”

Section: Introductionmentioning

confidence: 99%

Manganese Oxide/Iron Carbide Encapsulated in Nitrogen and Boron Codoped Carbon Nanowire Networks as Accelerated Alkaline Hydrogen Evolution and Oxygen Reduction Bifunctional Electrocatalysts

Liu

Guo

Han

et al. 2022

ACS Appl. Mater. Interfaces

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Along with the widespread applications of various energy storage and conversion devices, the prices of precious metal platinum (Pt) and transition-metal cobalt/nickel keep continuously growing. In the future, designing high-efficiency nonprecious-metal catalysts based on low-cost iron (Fe) and manganese (Mn) metals for hydrogen evolution reaction (HER) and oxygen reduction reaction (ORR) is fairly critical for commercial applications of hydrogen fuel cells. In this study, for the first time, we design novel three-dimensional (3D) hybrid networks consisting of manganese oxide (MnO)-modified, iron carbide (Fe3C)-embedded, and boron (B)/nitrogen (N) codoped hierarchically porous carbon nanofibers (denoted FeMn@BNPCFs). After optimizing the pyrolysis temperatures, the optimal FeMn@BNPCFs-900 catalyst displays the best HER and ORR catalytic activities in an alkaline solution. As expected, the HER onset potential (E onset) and the potential at a current density of −10 mA cm–2 for FeMn@BNPCFs-900 in 1.0 M KOH are just 36 and 194 mV more negative than the state-of-the-art 20 wt % Pt/C catalyst with more superior stability. In particular, the FeMn@BNPCFs-900 catalyst shows excellent ORR catalytic activity with a more positive E onset (0.946 V vs RHE), a more positive half-wave potential (E 1/2 = 0.868 V vs RHE), better long-term stability, and higher methanol tolerance surpassing the commercial 20 wt % Pt/C (E onset = 0.943 V vs RHE, E 1/2 = 0.854 V vs RHE) and most previously reported precious-metal-free catalysts in 0.1 M KOH. The synergistic effects of 3D hierarchically macro-/mesoporous architectures, advanced charge transport capacity, abundant carbon defects/edges, abundant B (2.3 atom %) and N (4.9 atom %) dopants, uniformly dispersed Fe3C@BNC NPs, and MnO nanocrystallines are responsible for the excellent HER/ORR catalytic activities of the FeMn@BNPCFs-900 catalyst.

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Defect-enriched carbon nanofibers encapsulating NiCo oxide for efficient oxygen electrocatalysis and rechargeable Zn-air batteries

Cited by 29 publications

References 53 publications

Preparation and Characterization of Multi-Doped Porous Carbon Nanofibers from Carbonization in Different Atmospheres and Their Oxygen Electrocatalytic Properties Research

Preparation and Characterization of Multi-Doped Porous Carbon Nanofibers from Carbonization in Different Atmospheres and Their Oxygen Electrocatalytic Properties Research

Thermal Engineering of NiCo‐Codoped Carbon Nanofibers toward Enhanced Oxygen Electrocatalysis for Zn–Air Batteries

Manganese Oxide/Iron Carbide Encapsulated in Nitrogen and Boron Codoped Carbon Nanowire Networks as Accelerated Alkaline Hydrogen Evolution and Oxygen Reduction Bifunctional Electrocatalysts

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