Electrosynthesised Metal (Ni, Fe, Co) Oxide Films on Single‐Walled Carbon Nanotube Platforms and Their Supercapacitance in Acidic and Neutral pH Media

Adekunle, Abolanle S.; Ozoemena, Kenneth I.

doi:10.1002/elan.201000597

Cited by 30 publications

(7 citation statements)

References 51 publications

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“…Enhanced capacitance of t‐CNW was observed in acidic solution (e. g. 1 M H 2 SO 4 ), where the redox reactions of the metal oxide and surface oxygen groups were more plausible (Figure S20) . This phenomenon can be attributed to the interfacial interaction between the ZnO nanocrystals and protons, which generates substantial pseudocapacitance to the electrode …”

Section: Electrochemical Supercapacitors Based On the Ternary Componementioning

confidence: 99%

One‐Step Synthesis of Multifunctional Zinc‐Iron‐Oxide Hybrid Carbon Nanowires by Chemical Fusion for Supercapacitors and Interfacial Water Marbles

et al. 2018

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Hybrid carbon nanowires with tunable elemental composition and nanoscale component mixing resolution can be synthesized by a chemical fusion method in one pot, using a unique heating mechanism of conducting polymers under the electromagnetic field of microwave. Carbon nanowire matrices hybridized with metals and oxides can be facilely synthesized by simple instrumentation and processes within tens of seconds. Different metallic precursors (e. g. Fe and Zn) can be selectively incorporated in the chemical fusion process that substantially integrated with the carbon nanowire matrices during the growth process while their characteristic functions are infused. The hybrid carbon nanowires show excellent electrochemical supercapacitive and supramolecular self‐assembly properties owing to the unique hybrid nanostructures and surface characteristics. “Interfacial water marbles” can be obtained by the supramolecular self‐assembly of hybrid carbon nanowires on the water/hexane interface. The interfacial water marbles are semi‐permanent and completely impede the event of coalescence cascade, demonstrating significant applications in mass transport, microfluidics, and interfacial synthesis.

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Section: Electrochemical Supercapacitors Based On the Ternary Componementioning

confidence: 99%

One‐Step Synthesis of Multifunctional Zinc‐Iron‐Oxide Hybrid Carbon Nanowires by Chemical Fusion for Supercapacitors and Interfacial Water Marbles

et al. 2018

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“…This discrepancy should perhaps not be surprising as other workers have observed in conducting polymers, and it could be attributed to factors such as the involvement of some physical and chemical heterogeneities [49] and deeply trapped counter ions which remain immobile during impedance experiment. [50] The capacitors discharging rate can be evaluated by the relaxation time constant τ 0 , which is defined as τ 0 = 1/2пf 0 , where f 0 corresponds to the peak frequency in the imaginary capacitance plot. [33,48] From Figure 12, the maximum value of C // are at 0.066 and 0.031 Hz for NiO prepared from Ni(OH) 2 and Ni(HCO 3 ) 2 , respectively, and thus the relaxation times are …”

Section: Electrochemical Properties Of the Nio Materialsmentioning

confidence: 99%

Comparative Studies of NiO Nanoparticles Prepared From Different Precursors for Electrochemical Capacitor

Yang

et al. 2013

Synthesis and Reactivity in Inorganic, Metal-Organic, and Nano-

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Using EPE as templates and hexamethylenetetramine as hydrolysis agent, precursors of Ni(OH) 2 and Ni(HCO 3 ) 2 are controllably synthesized through adjusting the heating temperature and time. After calcined at 500 • C, NiO nanoparticles have been fabricated from the precursors. The mesoporous NiO prepared from Ni(HCO 3 ) 2 had larger BET surface area than the microporous NiO prepared from Ni(OH) 2 . Both the NiO have good reversibility and capacitance capacity mainly resulted from pseudocapacitive capacitance. At the discharge current density of 500 mA g −1 , the specific capacitance values are 736 and 533 F g −1 for the NiO materials calcined from Ni(HCO 3 ) 2 and Ni(OH) 2 , respectively.

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“…Among them, NiO is one of the most promising candidates due to its high theoretical capacitance (2584 F g -1 ), environmentally benign nature, low cost and easy preparation process. For example, composites of NiO coupled with activated carbon, graphene, carbon nanotube (CNT), or carbon nanofiber (CNF) have been intensively studied for lithium-ion batteries and supercapacitors [10][11][12][13]. To obtain a high capacitance, a significantly large proportion of NiO ( > 5.0 wt%) is inevitable in these supercapacitors.…”

Section: Introductionmentioning

confidence: 99%

Dilute NiO/carbon nanofiber composites derived from metal organic framework fibers as electrode materials for supercapacitors

Yang

et al. 2017

Chemical Engineering Journal

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A new type of carbon nanofiber (CNF) dominated electrode materials decorated with dilute NiO particles (NiO/CNF) has been in situ fabricated by direct pyrolysis of Ni, Zn-containing metal organic framework fibers, which are skillfully constructed by assembling different proportional NiCl 2 •6H 2 O and Zn(Ac) 2 •2H 2 O with trimesic acid in the presence of N,N-dimethylformamide. With elegant combination of advantages of CNF and evenly dispersed NiO particles, as well as successful modulation of conductivity and porosity of final composites, our NiO/CNF composites display well-defined capacitive features. A high capacitance of 14926 F g-1 was obtained in 6 M KOH electrolyte when the contribution from 0.43 wt% NiO was considered alone, contributing to over 35% of the total capacitance (234 F g-1). This significantly exceeds its theoretical specific capacitance of 2584 F g-1. It has been established from the Ragone plot that a largest energy density of 33.4 Wh kg-1 was obtained at the current density of 0.25 A g-1. Furthermore, such composite electrode materials show good rate capability and outstanding cycling stability up to 5000 times (only 10% loss). The present study provides a brand-new approach to design a high capacitance and stable supercapacitor electrode and the concept is extendable to other composite materials.

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Electrosynthesised Metal (Ni, Fe, Co) Oxide Films on Single‐Walled Carbon Nanotube Platforms and Their Supercapacitance in Acidic and Neutral pH Media

Cited by 30 publications

References 51 publications

One‐Step Synthesis of Multifunctional Zinc‐Iron‐Oxide Hybrid Carbon Nanowires by Chemical Fusion for Supercapacitors and Interfacial Water Marbles

One‐Step Synthesis of Multifunctional Zinc‐Iron‐Oxide Hybrid Carbon Nanowires by Chemical Fusion for Supercapacitors and Interfacial Water Marbles

Comparative Studies of NiO Nanoparticles Prepared From Different Precursors for Electrochemical Capacitor

Dilute NiO/carbon nanofiber composites derived from metal organic framework fibers as electrode materials for supercapacitors

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