Electrochemical characteristics of iron carbide as an active material in alkaline batteries

An "in situ sacrifice" process was devised in this work as a room-temperature, all-solution processed electrochemical method to synthesize nanostructured NiO and FeO directly on current collectors. After electrodepositing NiZn/FeZn bimetallic textures on a copper net, the zinc component is etched and the remnant nickel/iron are evolved into NiO and FeO by the "in situ sacrifice" activation we propose. As-prepared electrodes exhibit high areal capacities of 0.47 mA h cm and 0.32 mA h cm , respectively. By integrating NiO as the cathode, FeO as the anode, and poly(vinyl alcohol) (PVA)-KOH gel as the separator/solid-state electrolyte, the assembled quasi-solid-state flexible battery delivers a volumetric capacity of 6.91 mA h cm at 5 mA cm , along with a maximum energy density of 7.40 mWh cm under a power density of 0.27 W cm and a maximum tested power density of 3.13 W cm with a 2.17 mW h cm energy density retention. Our room-temperature synthesis, which only consumes minute electricity, makes it a promising approach for large-scale production. We also emphasize the in situ sacrifice zinc etching process used in this work as a general strategy for metal-based nanostructure growth for high-performance battery materials.

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“…(3)-(5)]: [9,[31][32][33][34] Fe þ 2OH À Ð Fe OH ðÞ 2 þ 2e À ð3Þ 3Fe OH The followingr eactions represent the two-step oxidation of Fe [Eqs.…”

Section: Resultsmentioning

confidence: 99%

Metal Oxide Nanostructures Generated from In Situ Sacrifice of Zinc in Bimetallic Textures as Flexible Ni/Fe Fast Battery Electrodes

Huang

Liu

Zhang

et al. 2017

Chemistry An Asian Journal

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“…However, the capacity of the active material decreases quickly to less than 300 mAhg −1 during the second or third cycle. Although, other investigators made nanosized iron active materials, the reversibility was not improved [10][11][12][13][14]. This work describes a novel composite structure, Fe/Fe 3 O 4 /Graphene composite as negative electrode material and Ni hydroxide as a positive electrode for a rechargeable Ni/Fe alkaline batteries with high capacity, large cycle life, high power and energy density.…”

Section: Introductionmentioning

confidence: 95%

Fabrication Fe/Fe<sub>3</sub>O<sub>4</sub>/Graphene Nanocomposite Electrode Material for Rechargeable Ni/Fe Batteries in Hybrid Electric Vehicles

Kumar

Shukla

2013

ILCPA

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Fe/Fe 3 O 4 /Graphene composite electrode material was synthesized by a thermal reduction method and then used as anode material along with Nickel cathode in rechargeable Ni/Fe alkaline batteries in hybrid electric vehicles. Reduced graphene /Fe/Fe 3 O 4 composite electrode material was prepared using a facile three step synthesis involving synthesis of iron oxalate and subsequent reduction of exfoliated graphene oxide and iron oxalate by thermal decomposition method. The synthesis approach presents a promising route for a large-scale production of reduced graphene /Fe/Fe 3 O 4 composite as electrode material for Ni/Fe rechargeable batteries. The particle size and structure of the samples were characterized by SEM and XRD.

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“…This in-situ porosity formation upon growth on silicon can be beneficial for access of liquid-based media on the active centers of the structures. For instance, it may facilitate electrolyte ion diffusion with less resistance throughout the volume, that combined with the properties and stability as described above can provide a material with potential for applications in high performance supercapacitors and lithium ion batteries [21,36]. The n-hexane and water adsorption isotherms at 37 °C are shown in Fig.…”

Section: Ferrofluid Nps On Silicon Surfacementioning

confidence: 99%

One-step, in situ growth of unmodified graphene – magnetic nanostructured composites

Pilatos

Vermisoglou

Perdikaki

et al. 2014

Carbon

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Electrochemical characteristics of iron carbide as an active material in alkaline batteries

Cited by 51 publications

References 12 publications

Metal Oxide Nanostructures Generated from In Situ Sacrifice of Zinc in Bimetallic Textures as Flexible Ni/Fe Fast Battery Electrodes

Metal Oxide Nanostructures Generated from In Situ Sacrifice of Zinc in Bimetallic Textures as Flexible Ni/Fe Fast Battery Electrodes

Fabrication Fe/Fe<sub>3</sub>O<sub>4</sub>/Graphene Nanocomposite Electrode Material for Rechargeable Ni/Fe Batteries in Hybrid Electric Vehicles

One-step, in situ growth of unmodified graphene – magnetic nanostructured composites

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