Graphene oxide-modified nickel (II) tetra-aminophthalocyanine nanocomposites for high-power symmetric pseudocapacitor

Makgopa, Katlego; Ejikeme, Paul M.; Ozoemena, Kenneth I.

doi:10.1016/j.electacta.2016.07.027

Cited by 15 publications

(9 citation statements)

References 23 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…The mixture was then stirred for 30 min, resulting in a light brown suspension of GO. The obtained sample of GO was washed with an aqueous HCl in a ratio 9:1 of water:HCl, followed by continuous centrifugation and washing with deionized water until pH of about 7 was achieved, then dried at 80 °C for 12 h [20,21].…”

Section: Synthesis Of Gomentioning

confidence: 99%

Solvothermal synthesis of surfactant free spherical nickel hydroxide/graphene oxide composite for supercapacitor application

Khaleed

Bello

Dangbegnon

et al. 2017

Journal of Alloys and Compounds

View full text Add to dashboard Cite

Highlights• Use of solvothermal technique for production of nickel hydroxide/graphene oxide composite.• Spherical nickel hydroxide composed of nanosheets.• Excellent electrochemical properties of composite electrode material. AbstractSpherical composite of Ni(OH) 2 /GO was produced via a surfactant free solvothermal technique and tested as electrode materials for electrochemical capacitors. The structural and morphological analysis confirmed that deposition of Ni(OH) 2 onto GO does not change the crystal structure of pure hexagonal α-Ni(OH) 2 . Electrode fabricated from the Ni(OH) 2 /GO composite demonstrates a superior electrochemical performance when compared to that of pure Ni(OH) 2 , GO, and Mix-Ni(OH) 2 /GO electrodes with Ni(OH) 2 /GO electrode exhibiting a specific capacity of ∼420 mA h g -1 which correspond to a specific capacitance of 3619 F g -1 at 2.5 A g -1 , as well as a corresponding rate capability of 78% at 10 A g -1 . The stability study of the 2 Ni(OH) 2 /GO composite reveals a good capacity retention of ∼95% at a current density of 10 A g -1 after 3000 charge-discharge cycles.

show abstract

Section: Synthesis Of Gomentioning

confidence: 99%

Solvothermal synthesis of surfactant free spherical nickel hydroxide/graphene oxide composite for supercapacitor application

Khaleed

Bello

Dangbegnon

et al. 2017

Journal of Alloys and Compounds

View full text Add to dashboard Cite

show abstract

“…The improvement of the microstructure connectivity in PCs is one of the reason why some authors have proposed alternative routes based on different processing strategies such as the inclusion of metal phases in the semiconductor material [10,16], the application of a post-sintering heat treatment after a specific shaping process [17][18][19] or the mentioned combination of the metal oxide with carbon-based materials, such as activated carbon, carbon nanotubes, or other mesoporous materials. Among all of them, graphene-based materials are good candidates due to its two-dimensional hexagonal network and their delocalized electrons shows an elevated electronic conductivity, an intrinsic mechanical strength (flexible material), transparency and high specific surface area, which transform them in promising co-material to fabricate the electrodes with higher electrochemical performances [20,21]. However, graphene electrodes are limited due to the re-stacking problem caused by the strong π-π interaction and Van der Waals forces between their sheets, resulting in non-desirables properties like loss of exposed surface area, loss of the electric conductivity, and inferior ion accessibility.…”

Section: Introductionmentioning

confidence: 99%

Electrophoretic deposition of RGO-NiO core-shell nanostructures driven by heterocoagulation method with high electrochemical performance

Yus

Bravo

Sánchez-Herencia

et al. 2019

Electrochimica Acta

View full text Add to dashboard Cite

A heterocoagulation route is proposed to prepare Reduced Graphene Oxide-Nickel Oxide (RGO/NiO) hybrid structures for their application as supercapacitor electrodes. The RGO intercalation among the NiO nanoplatelets was carried out by electrostatic interactions of the synthetized particles which were previously dispersed and stabilized in aqueous media to improve the assembly between both materials forming core-shell structures. The electrophoretic deposition (EPD) was used to shape the composite onto 3D collector (Ni foams) controlling their growth and homogeneity. Electrodes were thermal treated at 325ºC during 1 h to improve the electrochemical response since the formation of ceramic necks among NiO semiconductor nanoparticles preserve the microstructural integrity avoiding the employment of binders to enhance their connectivity, while RGO contributes with the electrochemical double layer effect to step up the specific capacitance by reducing the charge transfer resistance. FESEM results confirmed that RGO nanosheets were full-covered by the NiO nanoplatelets and suggested that ~1mg of the electroactive composite homogeneously covers the Ni foam and it is the optimum among of electroactive material to avoid microstructural defects that produce ohmic drops limiting the capacitance. The electrochemical characterization of the resulting binder-free RGO/NiO electrodes was compared with the bare-NiO electrode. The hybrid composite exhibited excellent performance with a high specific capacitance of 940 Fg -1 at 2Ag -1 and a higher rate capability.

show abstract

“…Therefore, it is necessary to explore an effective method to enhance the reproducibility, stability, and photoelectrochemical activity, resulting in the ultra‐sensitive detection of molecules. Many studies have been reported to improve the electrocatalytic activities of the modified MTAPc composites such as CoTAPc‐sensitized graphene‐CdS nanocomposites , graphene oxide‐modified NiTAPc nanocomposites , and CuTAPc modified nanotube composites . Graphene oxide (GO) is a well‐known carbon material with oxygen‐containing functional groups, and has excellent mechanical stability.…”

Section: Introductionmentioning

confidence: 99%

Photoelectrochemical Detection of L‐Cysteine with a Covalently Grafted ZnTAPc‐Gr‐based Probe

et al. 2020

View full text Add to dashboard Cite

L‐cysteine plays a vital role in organisms, and is an important biomarker for many pathological diseases that seriously affect human health. In the study, a photoelectrochemical (PEC) probe with zinc‐tetramine phthalocyanine covalently grafted to graphene oxide (ZnTAPc‐Gr) was developed for L‐cysteine detection. Graphene oxide (GO) with carboxyl was used to immobilize zinc‐tetramine phthalocyanine (ZnTAPc) with amidogen (a graft structure formed by an amide covalent bond), which could firmly immobilize ZnTAPc, thereby improving the photoelectrochemical performance and stability. L‐cysteine molecule, an electron acceptor, was specifically recognized by the PEC probe, exhibiting a decrease in the photocurrent signal. Under the optimal experimental conditions, the fabricated PEC probe exhibited excellent performance in L‐cysteine analysis within a linear range of 0.25–113 μM and a detection limit of 11.4 nM. The PEC probe showed high sensitivity, selectivity, and stability. The method described herein provides an effective strategy for PEC probe construction for L‐cysteine detection, and can also serve as a promising PEC platform for the analyses of other small molecules.

show abstract

Graphene oxide-modified nickel (II) tetra-aminophthalocyanine nanocomposites for high-power symmetric pseudocapacitor

Cited by 15 publications

References 23 publications

Solvothermal synthesis of surfactant free spherical nickel hydroxide/graphene oxide composite for supercapacitor application

Solvothermal synthesis of surfactant free spherical nickel hydroxide/graphene oxide composite for supercapacitor application

Electrophoretic deposition of RGO-NiO core-shell nanostructures driven by heterocoagulation method with high electrochemical performance

Photoelectrochemical Detection of L‐Cysteine with a Covalently Grafted ZnTAPc‐Gr‐based Probe

Contact Info

Product

Resources

About