High-performance bifunctional oxygen electrocatalysts for zinc-air batteries over mesoporous Fe/Co-N-C nanofibers with embedding FeCo alloy nanoparticles

Li, Congling; Wu, Mengchen; Li, Rui

doi:10.1016/j.apcatb.2018.11.039

Cited by 367 publications

(146 citation statements)

References 42 publications

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“…2a that the CoFe/NC-0.2-900 was composed of a CoFe alloy and graphitic carbon, which was consistent with the above TEM analysis. The effective combination of a CoFe alloy can improve conductivity and increase the active sites of the electrocatalyst [37]. Raman spectroscopy was further adopted to characterize the carbon nanostructures.…”

Section: Resultsmentioning

confidence: 99%

Cubic imidazolate frameworks-derived CoFe alloy nanoparticles-embedded N-doped graphitic carbon for discharging reaction of Zn-air battery

Wang

et al. 2019

Sci. China Mater.

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The construction of transition metal-based catalysts with high activity and stability has been widely regarded as a promising method to replace the precious metal Pt for oxygen reduction reaction (ORR). Herein, we synthesized CoFe alloy nanoparticle-embedded N-doped graphitic carbon (CoFe/NC) nanostructures as ORR electrocatalysts. The ZIF-67 (zeolitic imidazolate framework, ZIF) nanocubes were first synthesized, followed by an introduction of Fe 2+ ions to form CoFe-ZIF precursors via a simple ion-exchange route. Subsequently, the CoFe/NC composites were synthesized through a facile pyrolysis strategy. The ORR activity and the contents of cobalt and iron could be effectively adjusted by controlling the solution concentration of Fe 2+ ions used for the ion exchange and the pyrolysis temperature. The CoFe/NC-0.2-900 composite (synthesized with 0.2 mmol of FeSO 4 •7H 2 O at a pyrolysis temperature of 900°C) exhibited ORR activity that was superior to the other samples owing to a synergistic effect of the bimetal, especially considering the extremely high limiting current density of 6.4 mA cm-2 compared with that of Pt/C (5.1 mA cm-2). Rechargeable Zn-air batteries were assembled employing CoFe/NC-0.2-900 and NiFeP/NF (NiFeP supported on nickel foam (NF)) as the catalysts for the discharging and charging processes, respectively, The above materials achieved reduced discharging and charging platforms, high power density, and prolonged cycling stability compared with conventional Pt/C+RuO 2 /C catalysts.

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Section: Resultsmentioning

confidence: 99%

Cubic imidazolate frameworks-derived CoFe alloy nanoparticles-embedded N-doped graphitic carbon for discharging reaction of Zn-air battery

Wang

et al. 2019

Sci. China Mater.

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“…Recently, transition‐metal–nitrogen–carbon nanocomposites have emerged as the substitutes to the bifunctional noble‐metal oxygen electrocatalysts . Especially, metal–organic frameworks (MOFs) are considered to be promising due to the abundant carbon, nitrogen, and transition‐metals along with the uniform porous structure .…”

Section: Introductionmentioning

confidence: 99%

2D Nitrogen‐Doped Carbon Nanotubes/Graphene Hybrid as Bifunctional Oxygen Electrocatalyst for Long‐Life Rechargeable Zn–Air Batteries

Deng

Chen

et al. 2019

Adv Funct Materials

218

141

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The rational construction of efficient bifunctional oxygen electrocatalysts is of immense significance yet challenging for rechargeable metal-air batteries. Herein, this work reports a metal-organic framework derived 2D nitrogendoped carbon nanotubes/graphene hybrid as the efficient bifunctional oxygen electrocatalyst for rechargeable zinc-air batteries. The as-obtained hybrid exhibits excellent catalytic activity and durability for the oxygen electrochemical reactions due to the synergistic effect by the hierarchical structure and heteroatom doping. The assembled rechargeable zinc-air battery achieves a high power density of 253 mW cm −2 and specific capacity of 801 mAh g Zn −1 with excellent cycle stability of over 3000 h at 5 mA cm −2 .Moreover, the flexible solid-state rechargeable zinc-air batteries assembled by this hybrid oxygen electrocatalyst exhibits a high discharge power density of 223 mW cm −2 , which can power 45 light-emitting diodes and charge a cellphone. This work provides valuable insights in designing efficient bifunctional oxygen electrocatalysts for long-life metal-air batteries and related energy conversion technologies.

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“…The OER performance of our catalyst is even better than the simple FeCo loaded N‐doped carbon nanofibers, FeCo encapsulated in N‐doped graphene and the simple FeCo NPs encapsulated in N‐doped CNTs that requires 240 mV, 440 mV and 450 mV overpotential to attain a current density of 10 mA cm −2 and a Tafel slope of 60 mV dec −1 , 90 mV dec −1 and 77 mV dec −1 , respectively. A control sample of CNT@CNFs was prepared by treating FeCo@NC‐12 with strong acid to remove the alloy NPs.…”

Section: Resultsmentioning

confidence: 90%

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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High-performance bifunctional oxygen electrocatalysts for zinc-air batteries over mesoporous Fe/Co-N-C nanofibers with embedding FeCo alloy nanoparticles

Cited by 367 publications

References 42 publications

Cubic imidazolate frameworks-derived CoFe alloy nanoparticles-embedded N-doped graphitic carbon for discharging reaction of Zn-air battery

Cubic imidazolate frameworks-derived CoFe alloy nanoparticles-embedded N-doped graphitic carbon for discharging reaction of Zn-air battery

2D Nitrogen‐Doped Carbon Nanotubes/Graphene Hybrid as Bifunctional Oxygen Electrocatalyst for Long‐Life Rechargeable Zn–Air Batteries

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

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