A facile hydrothermal reflux synthesis of Ni(OH)2/GF electrode for supercapacitor application

Khaleed, Abubakar A.; Bello, Abdulhakeem; Dangbegnon, Julien K.; Ugbo, F.U.; Barzegar, Farshad; Momodu, Damilola Y.; Masikhwa, T.M.; Olaniyan, Okikiola; Manyala, Ncholu I.

doi:10.1007/s10853-016-9910-y

Cited by 36 publications

(11 citation statements)

References 47 publications

(72 reference statements)

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“…NiCo LDH@Cu foam 1462.5 (1 A.g -1 ) 80. 46 % (2000) 2017 [ 60] The capacitance value of the binary Ni-Co sample is higher than that of Ni hydroxide and Co carbonate hydroxide itself using same synthesis route as proved in this work and in other reports [59][60][61][62]. Consequently, this improved EC performance is attributed to the binary Co 2+ /Co 3+ and Ni 2+ /Ni 3+ couples with different percentage (see Fig.…”

Section: Electrochemical Stepssupporting

confidence: 74%

“…For further investigation of the actual Ni-Co bi-phase nanohybrid electrodes, the impedance EIS spectra of obtained sample series were measured in the frequency range from 0.01 to 10 5 Hz in an open circuit potential (E oc ), as shown in figure 12. Almost all Nyquist plots were characterized by two distinct parts, a partial semicircle at high frequency due to the dispersion effect [61] and a straight deviated line from the imaginary axis at low frequency.…”

Section: -mentioning

confidence: 99%

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Electrochemical measurements of 1D/2D/3DNi-Co bi-phase mesoporous nanohybrids synthesized using free-template hydrothermal method

Guellati

Harat

Momodu

et al. 2018

Electrochimica Acta

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Graphical Abstract0 500 1000 1500 2000 65 Highlights  Ni/Co-precursor ratio effect on the template-free hydrothermal growth of carbonate and/or hydroxide nanocomposites.  Ni/Co-content ratio effect on electrochemical performance of Ni-Co based multiphase nanocomposites. 1D/2D/3D architecture microstructures of Ni-Co bi-phase nanohybrids as promising candidates for electrodes in supercapacitor application. AbstractIn this study, a facile and low cost free-template hydrothermal precipitation method was used to synthesize mesoporous Ni-Co based bimetallic carbonates (CO 3 ) 2and/or hydroxides (OH)micro/nanostructures with different morphologies (1D, 2D and 3D) based on variant stoichiometric compositions. The effect of the growth temperature, synthesis time as well as the Ni/Co-precursors ratio on the physico-chemical properties and faradic electrochemical behavior of these products was investigated. The as-obtained bi-phase nanohybrids were characterized using XRD, FTIR, Raman spectroscopy, TGA, FE-SEM and BET analysis. The textural analysis results confirmed the presence of mesoporous products with a BET-SSA arround 50 m 2 .g -1 and a corresponding pore volume of 0.52 cm 3 .g -1 for the 3D urchin-like structure while a BET-SSA of 47.14 m 2 .g -1 (with 0.31 cm 3 .g -1 pore volume) was obtained for the 2D nanoflakes structure.The CV, CD and EIS electrochemical measurements were performed in a 6.0 M KOH aqueous electrolyte. The excellent electrochemical performance recorded could be ascribed to the optimized composition of Ni-Co LDH (or α-Ni(OH) 2 ) with Co 2 (OH) 3 Cl and their unique hierarchical mesoporous nanoflake and urchin-like architectures. In addition, an exceptionally notable specific capacitance (capacity) of 1700 F.g -1 (161 C.g -1 ) and 1379 F.g -1 (192 C.g -1 )was obtained for both structures, respectively, at 5 mV.s -1 scan rate (0.5 A.g -1 gravimetric current density) compared with their better monohydroxides synthesized in same conditions 351 F.g -1 (90 C.g -1 ) for Ni and 216 F.g -1 (21.5 C.g -1 ) for Co. The electrode also showed good cyclic stability of ~98% after 2000 charge-discharge cycles at 30 A.g -1 making them potential materials suitable for fabricating energy storage devices.

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Section: Electrochemical Stepssupporting

confidence: 74%

Section: -mentioning

confidence: 99%

Electrochemical measurements of 1D/2D/3DNi-Co bi-phase mesoporous nanohybrids synthesized using free-template hydrothermal method

Guellati

Harat

Momodu

et al. 2018

Electrochimica Acta

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“…The Raman analysis (in Figure S3) also confirms the formation of the graphene layer. 32,33 The sheet resistance results of EN and EN/GC IDEs as a function of the processing time were shown in Figure 3a,b, respectively. In Figure 3a, the conductivity of EN films tends to increase with the plating time monotonically and become saturated after 30 min.…”

Section: ■ Experimental Sectionmentioning

confidence: 99%

RGO-Protected Electroless Plated Nickel Electrode with Enhanced Stability Performance for Flexible Micro-Supercapacitors

Huang

Lee

Zhang

et al. 2018

ACS Appl. Energy Mater.

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The ultrastable metal electrodes that can withstand the mechanical deformations of the soft substrates are always essential for the development of flexible supercapacitors. However, the metal electrode physically deposited on the flexible substrate is rigid and delaminated, and the contact interface is easily degraded under the mechanical cycling. The highly flexible and conductive composites with the intermixed metal−polymer structure as electrodes are key to solving the contact problem. In this work, a universal and facile method for flexible micro-supercapacitors (MSCs) with combination of nickel electroless plating (EN) and reduced graphene oxide (rGO) electrodeposition was presented. The so-called surface exchange and ion exchange (SMIE) technique has been employed to prepare the seed layer, and the electroless plating was conducted to deposit the Ni−P layer. The rGO-coated (GC) layer was then electrodeposited onto the Ni−P layer to form an EN/GC composite structure. EN/GC electrodes with symmetric interdigitated electrodes were fabricated at room temperature via an all-solution method. Due to the novel intermixed Nipolyimide interfacial structure, the highly flexible and mechanically stable EN/GC layer was formed. The introduction of GC enables the composite structure to be highly electrochemically stable. The result indicated that EN/GC electrodes exhibit superior charging and discharging performance without obvious capacitance degradation. The flexible micro-supercapacitors with EN/GC electrodes were also demonstrated and can work after 10 000 cycles of bending tests. The developed technology is compatible with the batch fabrication process and can be used to fabricate MSCs with high electrochemical stability.

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“…Graphene, a sp 2 hybrid carbon sheet with high electrical conductivity and excellent chemical stability, 14 has received extensive attention and has been used as an electrode material for supercapacitors and lithium-ion batteries. 15 However, strong p–p interactions between adjacent graphene lamellae lead to a certain degree of graphene aggregation, which results in a sharp decrease in the electrochemically active surface area, resulting in a lower specific capacitance.…”

Section: Introductionmentioning

confidence: 99%

Fabrication of composite material of RuCo₂O₄and graphene on nickel foam for supercapacitor electrodes

Meng

Lü

et al. 2022

RSC Adv.

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A facile hydrothermal reflux synthesis of Ni(OH)2/GF electrode for supercapacitor application

Cited by 36 publications

References 47 publications

Electrochemical measurements of 1D/2D/3DNi-Co bi-phase mesoporous nanohybrids synthesized using free-template hydrothermal method

Electrochemical measurements of 1D/2D/3DNi-Co bi-phase mesoporous nanohybrids synthesized using free-template hydrothermal method

RGO-Protected Electroless Plated Nickel Electrode with Enhanced Stability Performance for Flexible Micro-Supercapacitors

Fabrication of composite material of RuCo₂O₄and graphene on nickel foam for supercapacitor electrodes

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A facile hydrothermal reflux synthesis of Ni(OH)2/GF electrode for supercapacitor application

Cited by 36 publications

References 47 publications

Electrochemical measurements of 1D/2D/3DNi-Co bi-phase mesoporous nanohybrids synthesized using free-template hydrothermal method

Electrochemical measurements of 1D/2D/3DNi-Co bi-phase mesoporous nanohybrids synthesized using free-template hydrothermal method

RGO-Protected Electroless Plated Nickel Electrode with Enhanced Stability Performance for Flexible Micro-Supercapacitors

Fabrication of composite material of RuCo2O4and graphene on nickel foam for supercapacitor electrodes

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Fabrication of composite material of RuCo₂O₄and graphene on nickel foam for supercapacitor electrodes