Cobalt nanofibers encapsulated in a graphite shell by an electrospinning process

Barakat, Nasser A.M.; Kim, Bongsoo; Park, Soo‐Jin; Jo, Younghun; Jung, Myung-Hwa; Kim, Hee Young

doi:10.1039/b904669k

Cited by 125 publications

(86 citation statements)

References 65 publications

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“…The formation of pristine metal upon heating some metal acetate in an inert atmosphere was previously reported [25,33]. The corresponding phase changes could be supported by thermo-gravimetric studies.…”

Section: Characterization Of Cd-doped Co/c Nanoparticlessupporting

confidence: 53%

“…As shown in the first derivative data, there are many apparent peaks in the curve; the first and the second peaks (at ∼70℃ and ∼175℃, respectively) can be attributed to the liberation of physical (moisture) and chemical (combined water molecules with CoAc and CdAc) water from the sample, respectively [25,34]. In fact, the decompositions of CoAc and CdAc are not similar.…”

Section: Characterization Of Cd-doped Co/c Nanoparticlesmentioning

confidence: 98%

“…4(b), one can claim that the metallic nanoparticles are sheathed inside a good-crystallinity thin graphite layer. The envelopment of the cobalt nanostructures in the graphite shell was introduced by the same authors [25]. A good electric conductivity is an important parameter for electrocatalytic materials.…”

Section: Characterization Of Cd-doped Co/c Nanoparticlesmentioning

confidence: 99%

“…Because the maximum weight loss is obtained at approximately 225℃, according to the thermal decomposition data of pristine PVA [25], it is acceptable to say that this peak also represents the destruction of this polymer. The broad peak (at ∼510℃) can be attributed to the decomposition of the synthesized cobalt carbonate into cobalt monoxide (Eq.…”

Section: Characterization Of Cd-doped Co/c Nanoparticlesmentioning

confidence: 99%

“…The decomposition of PVA at temperatures slightly higher than its melting point causes the low carbonization yield. Recently, it was reported that cobalt distinctly enhances the graphitization of PVA and produces metallic nanostructures that are embedded in a graphite shell [24,25]. The formed graphite shell strongly enhances the chemical stability, which overcomes the first dilemma.…”

Section: Introductionmentioning

confidence: 99%

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Development of Cd-doped Co Nanoparticles Encapsulated in Graphite Shell as Novel Electrode Material for the Capacitive Deionization Technology

et al. 2013

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Because of the low energy requirement and the environmentally safe byproducts, the capacitive deionization water desalination technology has attracted the attention of many researchers. The important requirements for electrode materials are good electrical conductivity, high surface area, good chemical stability and high specific capacitance. In this study, metallic nanoparticles that are encapsulated in a graphite shell (Cd-doped Co/C NPs) are introduced as the new electrode material for the capacitive deionization process because they have higher specific capacitance than the pristine carbonaceous materials. Cd-doped Co/C NPs perform better than graphene and the activated carbon. The introduced nanoparticles were synthesized using a simple sol-gel technique. A typical sol-gel composed of cadmium acetate, cobalt acetate and poly(vinyl alcohol) was prepared based on the polycondensation property of the acetates. The physiochemical characterizations that were used confirmed that the drying, grinding and calcination in an Ar atmosphere of the prepared gel produced the Cd-doped Co nanoparticles, which were encapsulated in a thin graphite layer. Overall, the present study suggests a new method to effectively use the encapsulated bimetallic nanostructures in the capacitive deionization technology.

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Section: Characterization Of Cd-doped Co/c Nanoparticlessupporting

confidence: 53%

Section: Characterization Of Cd-doped Co/c Nanoparticlesmentioning

confidence: 98%

Section: Characterization Of Cd-doped Co/c Nanoparticlesmentioning

confidence: 99%

Section: Characterization Of Cd-doped Co/c Nanoparticlesmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 3 more Smart Citations

Development of Cd-doped Co Nanoparticles Encapsulated in Graphite Shell as Novel Electrode Material for the Capacitive Deionization Technology

et al. 2013

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Room‐Temperature Electrochemical Conversion of Metal–Organic Frameworks into Porous Amorphous Metal Sulfides with Tailored Composition and Hydrogen Evolution Activity

Ifraemov

Raslin

et al. 2018

Adv Funct Materials

130

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The conversion of metal-organic frameworks (MOFs) into inorganic nanomaterials is considered as an attractive means to produce highly efficient electrocatalysts for alternative-energy related applications. Yet, traditionally employed MOF-conversion conditions (e.g., pyrolysis) commonly involve multiple complex high-temperature reaction processes, which often make it challenging to control the composition, pore structure, and active-sites of the MOF-derived catalysts. Herein, a general, simple, room-temperature method is presented for a controlled electrochemical conversion of MOF (EC-MOF) films into porous, amorphous metal sulfides (a-MS x ). Detailed X-ray photoelectron spectroscopy analysis and control over independent EC-MOF parameters (e.g., scan-rate and potential window) enable to gain insights on the MOFconversion mechanisms, and in turn to fine-tune the porosity and composition of the obtained MS x . As a result, a highly active amorphous cobalt sulfide (a-CoS x ) electrocatalyst can be designed for hydrogen evolution reaction in neutral pH. Furthermore, the adjustable nature of the EC-MOF method allows to draw conclusions about the correlation between the concentration of catalytically active species (S 2 2sites) and the hydrogen evolution properties of the a-CoS x . Given the method's generality and the diversity of available MOF structures, EC-MOF provides a compelling platform for a rational design of a wide variety of active electrocatalytic materials.

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Interfacing Manganese Oxide and Cobalt in Porous Graphitic Carbon Polyhedrons Boosts Oxygen Electrocatalysis for Zn–Air Batteries

et al. 2019

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Rational design and synthesis of highly active and robust bifunctional non‐noble electrocatalysts for both oxygen evolution reaction (OER) and oxygen reduction reaction (ORR) are urgently required for efficient rechargeable metal–air batteries. Herein, abundant MnO/Co heterointerfaces are engineered in porous graphitic carbon (MnO/Co/PGC) polyhedrons via a facile hydrothermal‐calcination route with a bimetal–organic framework as the precursor. The in situ generated Co nanocrystals not only create well‐defined heterointerfaces with high conductivity to overcome the poor OER activity but also promote the formation of robust graphitic carbon. Owing to the desired composition and formation of the heterostructures, the resulting MnO/Co/PGC exhibits superior activity and stability toward both OER and ORR, which makes it an efficient air cathode for the rechargeable Zn–air battery. Importantly, the homemade Zn–air battery is able to deliver excellent performance including a peak power density of 172 mW cm−2 and a specific capacity of 872 mAh g−1, as well as excellent cycling stability (350 cycles), outperforming commercial mixed Pt/C||RuO2 catalysts. This work highlights the synergy from heterointerfaces in oxygen electrocatalysis, thus providing a promising approach for advanced metal–air cathode materials.

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Cobalt nanofibers encapsulated in a graphite shell by an electrospinning process

Cited by 125 publications

References 65 publications

Development of Cd-doped Co Nanoparticles Encapsulated in Graphite Shell as Novel Electrode Material for the Capacitive Deionization Technology

Development of Cd-doped Co Nanoparticles Encapsulated in Graphite Shell as Novel Electrode Material for the Capacitive Deionization Technology

Room‐Temperature Electrochemical Conversion of Metal–Organic Frameworks into Porous Amorphous Metal Sulfides with Tailored Composition and Hydrogen Evolution Activity

Interfacing Manganese Oxide and Cobalt in Porous Graphitic Carbon Polyhedrons Boosts Oxygen Electrocatalysis for Zn–Air Batteries

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