Nickel(ii) tetra-aminophthalocyanine modified MWCNTs as potential nanocomposite materials for the development of supercapacitors

This study reports the electrochemical performance and stability of MnO x -multiwall carbon nanotubes (MWCNTs) nanocomposite/Ni pseudocapacitor electrodes fabricated by a modified electrophoretic deposition (EPD) method. The nanocomposite electrode consisting of highly dispersed manganese oxide on MWCNTs was synthesized by a redox titration method at room temperature. The electrochemical properties of the electrode were demonstrated by cyclic voltammetry. The mean specific capacitances at a constant scan rate of 100 mV/s of MnO x -MWCNTs nanocomposites without and with heat treatment at temperatures 150, 200, and 250 C for 2 h are 378, 402, 445, and 469 F/g, respectively, which indicate an increase with increasing annealing temperature. During stability tests, the as-grown MnO x -MWCNTs nanocomposite electrode can preserve 80% of its original capacitance after 6000 cycles of operation which can be increased to 86% after annealing at 200 C for 2 h. The EPD MnO x / MWCNTs coaxial nanocomposite pseudocapacitors with manganese oxide ionized by H þ ion process exhibit high specific capacitance, fast reaction rate, high stability, and have high potential for practical applications.

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“…23 This nonideal behavior is believed due to the presence of pseudocapacitive nature of the MnO x -MWCNTs nanocomposite.…”

Section: Resultsmentioning

confidence: 99%

Electrophoretic Fabrication and Characterizations of Manganese Oxide/Carbon Nanotube Nanocomposite Pseudocapacitors

Hung

Lin

et al. 2011

J. Electrochem. Soc.

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“…Such mild strategies stand in strong contrast to other high-throughput techniques involving strong treatment of graphite with strong oxidants [23][24][25] or ionic intercalation, [26][27][28] where conversions (reduction of graphene oxide to obtain graphene or ionic de-intercalation) are by no means quantitative and results in irreversible re-aggregation and permanent lattice defects. 29,30 Commercial graphite flakes or hBN powders were mixed with N-methyl-pyrrolidinone (NMP) with initial concentration of 1 g l À1 and sonicated for 1 hour in a low power sonic bath (Ultrawave U50 ultrasonic bath 100 W, 42 kHz) before being centrifuged at 1000 rpm for another hour.…”

Section: Methodsmentioning

confidence: 99%

“…1) in solution. Phthalocyanines are molecular semiconductors that have been shown to have interesting effects on the electrical and optical properties of multi-walled carbon nanotubes 23 and are expected to show similar, if not greater, effects on 2D nanomaterials.…”

Section: Introductionmentioning

confidence: 99%

Single-step exfoliation and chemical functionalisation of graphene and hBN nanosheets with nickel phthalocyanine

et al. 2012

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Versatile routes to functionalise few-layer graphene and hBN with nickel phthalocyanine (Ni-Pc) were achieved using liquid phase exfoliation and sonication methods. EDX performed on the graphene//NiPc specimen showed nickel on the flake surface whilst Raman spectroscopy revealed a prominent D peak indicating the presence of basal plane defects. New Raman active modes were also found in the hBN//Ni-Pc complex. X-ray photoelectron spectroscopy showed a charge transfer for both graphene and hBN confirming that the flake edges and basal-planes were covalently functionalised by the phthalocyanine molecules. Transmission electron microscopy confirmed the only presence of single and few-layer flakes of hBN and graphene in solution, demonstrating that the exfoliation yield was not affected by the functionalisation step. We therefore proved that tuning of the electronic and optical properties of graphene and hBN nanosheets is indeed conceivable. We used the Z-scan technique to prove the nonlinear optical (NLO) behaviour of the functionalised graphene sheets. Based on such optical response, we demonstrate an optical limiting effect for nanosecond laser pulses at 532 nm, proving these materials to be a suitable candidate for photonic and optoelectronic applications.

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“…[2][3][4] Since the rst report of their electrochemical behaviour towards oxygen reduction reaction by Kobayashi et al 5 two decades ago, there has been no study on any other possible electrochemical applications. Unlike their MPc counterparts, [6][7][8] there is no report on the electrochemical capacitive properties of MTPyzPz. This is one of the primary motivations for the present study.…”

Section: Introductionmentioning

confidence: 99%

High-performance aqueous asymmetric electrochemical capacitors based on graphene oxide/cobalt(ii)-tetrapyrazinoporphyrazine hybrids

et al. 2013

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Nickel(ii) tetra-aminophthalocyanine modified MWCNTs as potential nanocomposite materials for the development of supercapacitors

Cited by 165 publications

References 43 publications

Electrophoretic Fabrication and Characterizations of Manganese Oxide/Carbon Nanotube Nanocomposite Pseudocapacitors

Electrophoretic Fabrication and Characterizations of Manganese Oxide/Carbon Nanotube Nanocomposite Pseudocapacitors

Single-step exfoliation and chemical functionalisation of graphene and hBN nanosheets with nickel phthalocyanine

High-performance aqueous asymmetric electrochemical capacitors based on graphene oxide/cobalt(ii)-tetrapyrazinoporphyrazine hybrids

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