High performance asymmetric supercapacitor based on CoAl-LDH/GF and activated carbon from expanded graphite

Masikhwa, T.M.; Madito, M.J.; Momodu, Damilola Y.; Dangbegnon, Julien K.; Guellati, O.; Harat, Aicha; Guérioune, M.; Barzegar, Farshad; Manyala, Ncholu I.

doi:10.1039/c6ra07419g

Cited by 72 publications

(35 citation statements)

References 61 publications

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“…To do so, cyclic voltammetry (CV) curves for the least and the most spaced LDHs were performed to ascertain the presence of the Co(OH) 2 redox processes and to evaluate possible differences in the current density of those peaks (Figure and Figure S10). In all cases, these peaks are observable between 0.1–0.4 V, as reported elsewhere . As it can be observed from CV, the current density increases upon the enlargement of the basal space.…”

Section: Resultssupporting

confidence: 86%

Boosting the Supercapacitive Behavior of CoAl Layered Double Hydroxides via Tuning the Metal Composition and Interlayer Space

Silva

Sanchis‐Gual

Carrasco

et al. 2020

Batteries & Supercaps

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Layered double hydroxides (LDHs) are promising supercapacitor materials due to their wide chemical versatility, earth abundant metals and high specific capacitances. Many parameters influencing the supercapacitive performance have been studied such as the chemical composition, the synthetic approaches, and the interlayer anion. However, no systematic studies about the effect of the basal space have been carried out. Here, two‐dimensional (2D) CoAl‐LDHs were synthesized through anion exchange reactions using surfactant molecules in order to increase the interlayer space (ranging from 7.5 to 32.0 Å). These compounds exhibit similar size and dimensions but different basal space to explore exclusively the interlayer distance influence in the supercapacitive performance. In this line, Co : Al ratios of 2 : 1, 3 : 1 and 4 : 1 were explored. In all cases, an enhancement of the specific capacitance was observed by increasing the basal space, reaching ca. 50 % more than the value obtained from the less‐spaced 2 : 1 CoAl‐LDH (going from ca. 750 to 1100 F.g−1 at 1 A.g−1). This increment mainly occurs because of the increase in the electrochemical surface area (up to ca. 260 %) and the higher electrolyte diffusion. Interestingly, the best performance is achieved for the lowest Co : Al ratio (i. e. the highest Al content) revealing the important role of the electrochemically inert Al in the structure.

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Section: Resultssupporting

confidence: 86%

Boosting the Supercapacitive Behavior of CoAl Layered Double Hydroxides via Tuning the Metal Composition and Interlayer Space

Silva

Sanchis‐Gual

Carrasco

et al. 2020

Batteries & Supercaps

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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: 76%

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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“…The mass balancing between the positive and negative electrodes was accurately determined by further considering [30]:…”

Section: Electrochemical Measurementsmentioning

confidence: 99%

Synthesis of ternary NiCo-MnO2 nanocomposite and its application as a novel high energy supercapattery device

Oyedotun

Madito

Momodu

et al. 2018

Chemical Engineering Journal

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High performance asymmetric supercapacitor based on CoAl-LDH/GF and activated carbon from expanded graphite

Cited by 72 publications

References 61 publications

Boosting the Supercapacitive Behavior of CoAl Layered Double Hydroxides via Tuning the Metal Composition and Interlayer Space

Boosting the Supercapacitive Behavior of CoAl Layered Double Hydroxides via Tuning the Metal Composition and Interlayer Space

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

Synthesis of ternary NiCo-MnO2 nanocomposite and its application as a novel high energy supercapattery device

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