Stoichiometry–grain size-specific capacitance interrelationships in nickel oxide

Parashtekar, Alhad; Bourgeois, Laure; Tatiparti, Sankara Sarma V.

doi:10.1039/d1ra09000c

Cited by 10 publications

(3 citation statements)

References 76 publications

(183 reference statements)

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“…The electrochemical activity also has been interrupted due to the lack of ion diffusion from the electrolyte-electrode surface [14][15][16]. This Csp value are comparable with other work [14][15][16][17]. From Figure 4, the GCD curve at different scan rates starts from 0.3, 0.5, and 0.7 Ag -1 has properly shown.…”

Section: Resultssupporting

confidence: 82%

Characterization of Reduced Graphene Oxide/Activated Carbon-Based Electrode Containing Mixing CMC-SBR Binder and Application in Supercapacitor

Azam,

Aziz,

Adaham

et al. 2022

Jurnal Teknologi

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In this work, variation of mixing a combination of carboxymethylcellulose (CMC) and styrene-butadiene rubber (SBR) as both used as the binder in the electrode has been studied. The purpose of using CMC-SBR as the binder in the electrode is to achieve a high supercapacitor performance. The electrode preparation has been carried out by mixing the reduced graphene oxide (rGO) and activated carbon (AC) in a blender. The binder preparation started by dissolving the CMC and SBR in the deionized water using a clean glass container. Then, rGO/AC has been stirred with the CMC-SBR for 60 minutes until a homogenous slurry formed. All electrodes have been characterized with Raman spectroscopy. The electrochemical tests such as cyclic voltammetry (CV) and galvanostatic charge-discharge (GCD) for all electrode compositions were performed. The electrode with 4:6 (in weight percentage) of CMC-SBR shows the highest specific capacitance (Csp) of 59.65 F g-1 (CV scan rate of 1 mV s-1) and 12.82 F g-1 from GCD test. This confirmed that the electrode containing 4 wt.% of CMC and 6 wt.% of SBR resulting in the best composition, which is reliable and practical for the supercapacitor application.

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Section: Resultssupporting

confidence: 82%

Characterization of Reduced Graphene Oxide/Activated Carbon-Based Electrode Containing Mixing CMC-SBR Binder and Application in Supercapacitor

Azam,

Aziz,

Adaham

et al. 2022

Jurnal Teknologi

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“…Moreover, the ratio of the intensities of defect to metal oxide peaks ( I O2 / I O1 ) increases from ferns to microspheres as ∼0.3, ∼0.4, and ∼0.7, respectively. The increasing binding energies and the intensity ratios from ferns to microspheres suggest that they can possess a lower concentration of oxygen vacancies than microspheres . Such, possibly, a higher concentration of oxygen vacancies in microspheres is a result of the chemically basic nature of the compounds (sodium citrate and NaOH) employed in its synthesis (Scheme ).…”

Section: Resultsmentioning

confidence: 95%

“…The increasing binding energies and the intensity ratios from ferns to microspheres suggest that they can possess a lower concentration of oxygen vacancies than microspheres. 33 Such, possibly, a higher concentration of oxygen vacancies in microspheres is a result of the chemically basic nature of the compounds (sodium citrate and NaOH) employed in its synthesis (Scheme 1). 24 Such trends in binding energies and the intensity ratios suggest a possibility of microspheres (or ferns) exhibiting the highest (or lowest) capacitance.…”

Section: Resultsmentioning

confidence: 99%

Are Fractal-Like Structures Beneficial for Supercapacitor Applications? A Case Study on Fe₂O₃ Negative Electrodes

et al. 2022

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The question of whether fractal-like structures are beneficial for supercapacitor applications is investigated by hydrothermally synthesizing Fe2O3 in fern, flake, and microsphere morphologies with similar specific surface areas. Their negative electrodes are prepared by supporting them on nickel foam (NF). The fractal dimensions (FDEIS) of these morphologies estimated from electrochemical impedance spectroscopy are ∼2.50, ∼2.36, and ∼2.19, respectively. The Fern@NF electrode exhibits the highest specific capacitance (C sp) of ∼2708 and ∼104 F g–1 at 1 and 5 A g–1, respectively, with an ∼94% capacitance retention after 2000 cycles. The capacitive (nonfaradaic) surface charge storage contribution from cyclic voltammetry increases with FDEIS from microspheres to ferns. Interestingly, such an increase in FDEIS leads to a decrease in the estimated impedance (Z CPE) in that order enhancing the performance of ferns. Hence, fractal-like structures are beneficial for supercapacitor applications by promoting capacitive surface charge storage through low Z CPE. The emphasis of this work is to study the effect of fractal dimension on the charge storage performance of Fe2O3 electrodes, which is scarcely addressed in the literature. The methodology presented here can be useful in designing/synthesizing a novel supercapacitor material possessing fractal-like structures with a potential for scale-up and commercialization.

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In‐Situ Growth of 2D to 3D NiO on Nickel Foam with Enhanced Capacity Retention as Battery‐Type Electrode for Asymmetric Supercapacitor

Wihdatul Himmah,

Wulan Septiani,

Wustoni

et al. 2024

ChemNanoMat

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This work presents a systematic study to synthesize NiO on nickel foam (NF) using a straightforward and cost‐efficient hydrothermal method, followed by calcination. Through comprehensive physicochemical analyses, it was demonstrated that the properties of the resultant NF@NiO could be modulated by adjusting the concentration of the nickel nitrate hexahydrate precursor. Notably, a morphological transition from a 2D sheet‐like structure to a 3D rambutan‐like formation was observed as the precursor concentration increased. The best‐performing NF@NiO 4 mM showed a maximum areal capacity of 723 mC cm‐2 (equivalent to 547.73 F g‐1) at a current density of 0.5 mA cm‐2. This electrode also maintained remarkable cycle stability, retaining 78.9% of its capacitance after 10,000 cycles at a current density of 50 mA cm‐2 in 2 M KOH. Furthermore, ASC (NiO 4 mM//AC) achieved a specific capacitance of 64.79 F g‐1 at a current density of 1 A g‐1 with an energy density of 17.63 Wh kg‐1 at a power density of 700 W kg‐1.

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Stoichiometry–grain size-specific capacitance interrelationships in nickel oxide

Abstract: Grain size, stoichiometry and specific capacitance in NiO are interrelated.

Cited by 10 publications

References 76 publications

Characterization of Reduced Graphene Oxide/Activated Carbon-Based Electrode Containing Mixing CMC-SBR Binder and Application in Supercapacitor

Characterization of Reduced Graphene Oxide/Activated Carbon-Based Electrode Containing Mixing CMC-SBR Binder and Application in Supercapacitor

Are Fractal-Like Structures Beneficial for Supercapacitor Applications? A Case Study on Fe₂O₃ Negative Electrodes

In‐Situ Growth of 2D to 3D NiO on Nickel Foam with Enhanced Capacity Retention as Battery‐Type Electrode for Asymmetric Supercapacitor

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Stoichiometry–grain size-specific capacitance interrelationships in nickel oxide

Abstract: Grain size, stoichiometry and specific capacitance in NiO are interrelated.

Cited by 10 publications

References 76 publications

Characterization of Reduced Graphene Oxide/Activated Carbon-Based Electrode Containing Mixing CMC-SBR Binder and Application in Supercapacitor

Characterization of Reduced Graphene Oxide/Activated Carbon-Based Electrode Containing Mixing CMC-SBR Binder and Application in Supercapacitor

Are Fractal-Like Structures Beneficial for Supercapacitor Applications? A Case Study on Fe2O3 Negative Electrodes

In‐Situ Growth of 2D to 3D NiO on Nickel Foam with Enhanced Capacity Retention as Battery‐Type Electrode for Asymmetric Supercapacitor

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Are Fractal-Like Structures Beneficial for Supercapacitor Applications? A Case Study on Fe₂O₃ Negative Electrodes