High-performance supercapacitor electrode based on a layer-by-layer assembled maghemite/magnetite/reduced graphene oxide nanocomposite film

Gross, Marcos A.; Monroe, Khristal; Hawkins, S.A.; Quirino, Rafael L.; Moreira, S. G. C.; Pereira-da-Silva, Marcelo A.; Almeida, Sthéfane Valle de; Faria, Ronaldo C.; Paterno, Leonardo G.

doi:10.1016/j.jelechem.2022.116123

Cited by 5 publications

(2 citation statements)

References 51 publications

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“…Therefore, understanding the behavior of C d as a function of various system parameters is of significant practical interest. To study the C d behavior, Experimental, [52,[61][62][63][64] computational, [26,46,[65][66][67][68][69] and theoretical methods [30,44,51,[70][71][72][73][74][75][76][77][78] have been utilized in the field.…”

Section: J Stat Mech (2024) 053205mentioning

confidence: 99%

Electrode wettability and capacitance of electrical double layer capacitor: a classical density functional theory study

Tian,

Zhou

2024

J. Stat. Mech.

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We suggest a coarse-grained water model for use in classical density functional theory (cDFT) to describe aqueous inorganic salt solutions that act as working electrolytes in electrical double-layer capacitors (EDLCs) with electrodes comprising two face-to-face doped carbon monolayers. Focus of the cDFT calculations lies on the influence of solvent electrode wettability (SEW) on capacitance and energy storage behaviors, while also considering its interaction with factors like electrolyte bulk concentration, pore size, electrode voltage, and temperature. New phenomena are disclosed theoretically. Remarkably, this study challenges the traditional notion that energy storage is consistently boosted by enhancing the electrode’s ionophobicity. Contrarily, the SEW effect reduces energy storage below the standard aqueous electrochemical window voltage (around 1.2 V) and only enhances the energy storage as the voltage surpasses a certain threshold up to the optimal window voltage (2 V–2.5 V). Furthermore, a non-monotonic SEW effect on energy storage is demonstrated under appropriate conditions, shedding new light on the complex relationship between ionophobicity and energy storage. Moreover, the present coarse-grained water model enables the prediction of the experimentally observed inverse relationship between temperature and capacitance. In contrast, the widely used electrolyte primitive model predicts the existence of a maximum value. The decisive factor for the impact of SEW on capacitance and energy storage is identified as congestion within the electrode pore, while other factors contribute by affecting this congestion. The present research offers valuable insights, highlighting the significance of SEW in the innovative and strategic design of aqueous inorganic EDLC devices.

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Section: J Stat Mech (2024) 053205mentioning

confidence: 99%

Electrode wettability and capacitance of electrical double layer capacitor: a classical density functional theory study

Tian,

Zhou

2024

J. Stat. Mech.

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“…Nowadays, extensive study is being carried out on Fe3O4 nanoparticles because Fe3O4 has unique properties like superparamagnetic in nanosize. This nature has developed into fundamentals that can be applied in a variety of fields, such as drug delivery system agents (DDS) [2], radar absorption [3], supercapacitors [4], photochatalitic [4], and magnetic sensors [5,6].…”

Section: Introductionmentioning

confidence: 99%

Preparation of synthesis nanoparticles Fe3O4 based on iron sand Sumbawa

Bahtiar,

Widyawati,

Yanuar

et al. 2023

J. Pijar.MIPA

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Iron sand generally contains minerals such as ilmenite, magnetite, and hematite. Based on the results of previous tests, the main composition of iron sand in Rhee, Sumbawa regency, is magnetite. One method to increase the Fe content in iron sand is by pre-treatment with NaOH. NaOH is also used to precipitate heavy metals in a mineral. In this study, three variations were carried out with the ratio of NaOH: iron sand, namely: 1: 4, 2: 4, and 3: 4 at a temperature of 300 C. Furthermore, the calcination results were followed by the synthesis of Fe3O4 nanoparticles using the coprecipitation method. The results of the XRF characterization showed an increase in Fe levels after being processed by the alkalization treatment. The highest concentration was obtained in 1:4, with a Fe percentage of 91.1%. The results of the XRD characterization showed that the synthesis of Fe3O4 was successfully carried out with single phase Fe3O4 amlording to the data reference 96-9005839 forms and the space group F d -3 m. Crystal size analysis Using the Debey-Scherrer equation, the respective sizes were 12.7 nm, 8.71 nm, and 9.76 nm, respectively.

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Targeting application of hierarchical porous carbon by facile one-step site-specific activation of wood powder: CO2 adsorption and supercapacitors

Liu

et al. 2022

Journal of Electroanalytical Chemistry

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High-performance supercapacitor electrode based on a layer-by-layer assembled maghemite/magnetite/reduced graphene oxide nanocomposite film

Cited by 5 publications

References 51 publications

Electrode wettability and capacitance of electrical double layer capacitor: a classical density functional theory study

Electrode wettability and capacitance of electrical double layer capacitor: a classical density functional theory study

Preparation of synthesis nanoparticles Fe3O4 based on iron sand Sumbawa

Targeting application of hierarchical porous carbon by facile one-step site-specific activation of wood powder: CO2 adsorption and supercapacitors

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