Large-scale single-step synthesis of wrinkled N–S doped 3D graphene like nanosheets from Tender palm shoots for high energy density supercapacitors

Mangisetti, Sandhya Rani; Kamaraj, M.; Ramaprabhu, Sundara

doi:10.1016/j.ijhydene.2020.09.161

Cited by 34 publications

(11 citation statements)

References 48 publications

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“…Furthermore, HOMAC‐2 to 6 samples also exhibit low intensity of 2D and D+G bands at ∼2680 and ∼2890 cm −1 respectively, which attributed to the existence of few‐layer and ordered graphene‐like carbon structure [44] . The above results demonstrate that the spectrum is characteristic of graphene‐like nanosheets [45] . Moreover, the obtained HOMAC products with highly ordered graphitic structure is more beneficial for the transmission of ions in the material [46] …”

Section: Resultsmentioning

confidence: 78%

Highly Ordered Micropores Activated Carbon from Long Fiber Biomass for High Energy Density Supercapacitors

Zhang

Tian

et al. 2021

ChemistrySelect

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The electrochemical performance of carbon based supercapacitors not only depends on the specific surface area and conductivity, but also the structure of materials. In order to construct the carbon materials with effective structure, the long fibrous plant‐saussurea involucrata stalk was chosen as the new style carbon source. Highly ordered micropores activated carbon (HOMAC) materials have been successfully obtained via KOH chemical activation method. The synthesized HOMAC exhibits high specific surface area of 2692 m2 g−1 and pore volume of 1.14 cm3 g−1. The assembled HOMAC‐based electrode can deliver a high specific capacitance of 379 F g−1 at 2 mV s−1 in 1 M H2SO4 aqueous electrolyte, and show excellent cyclic stability (the capacitance retention ∼95 %) over 10000 cycles at a current density of 1 A g−1, which authenticates excellent charge storage capacity of electrode material. Moreover, the operation voltage window can be expanded to 0–1.8 V in 1 M Na2SO4 electrolyte for the 2‐electrode system. The symmetric supercapacitor can deliver a high energy density of 33.91 Wh kg−1 at power density of 180.03 W kg−1. These high performances can be ascribed to the high surface area and ordered microporous structures obtained using KOH as activator. We further discussed the relationship between fibrous plants and electrochemical performances of the final activated carbon materials. This present work can provide beneficial guidance for the preparation of high performance activated carbon electrodes from a biomass‐based carbon source. Comparing with two different biomass materials, it can be found that the ionic diffusion coefficient of saussurea involucrata is 5.074×10−13 m2 s−1, which is 2.5 times of cotton stalk (1.547×10−13 m2 s−1). This phenomenon indicates the different ion transmission rate in different pore structures.

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Section: Resultsmentioning

confidence: 78%

Highly Ordered Micropores Activated Carbon from Long Fiber Biomass for High Energy Density Supercapacitors

Zhang

Tian

et al. 2021

ChemistrySelect

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“…The data were collected from multiple literature and compiled into a CSV file (available in Supporting Information .CSV and their source in Table S1), with references to the sources provided ,,,− ,− and our previous work. , The collected information includes parameters such as SA, DG, percentage of nitrogen dopant (% N), oxygen dopant (% O), sulfur dopant (% S), current density (CD), electrolyte concentration (CONC), and CAP. In the case of missing data (e.g., DG), the K -Nearest Neighbors imputation (KNN imputation) will be used to fill in the gaps.…”

Section: Methodsmentioning

confidence: 99%

“…Knowing the optimal doping condition is crucial to enhance the capacitive properties of graphene-based supercapacitors and can reduce experimental time, this could be done by employing data analysis and machine learning. , This approach can avoid the random synthesis procedure, which results in a randomly doped content without knowing the final CAP properties. Hence, the understanding of graphene doping can be done within a single click instead of performing a traditional synthesis method, which require almost a week. ,, By utilizing the vast experimental data available in the literature, ,,,− the optimum doping condition can be determined to avoid trial-and-error doping and achieve superior CAP. Additionally, this can lead to cost reduction and energy efficiency, as high temperatures are required for some synthesis method, e.g., chemical vapor deposition .…”

Section: Introductionmentioning

confidence: 99%

“…Doping graphene with heteroatoms has shown to significantly enhance its CAP compared to its pure counterpart, as evidenced by various studies. − However, the electrochemical field is still debating the optimal conditions for doping graphene electrodes . Hence, it is essential to investigate the underlying factors that influence supercapacitor CAP, such as SA, doping contents including oxygen, sulfur, and nitrogen, as well as the defect ratio (DG).…”

Section: Introductionmentioning

confidence: 99%

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Unlocking the Full Potential of Heteroatom-Doped Graphene-Based Supercapacitors through Stacking Models and SHAP-Guided Optimization

Deshsorn,

Payakkachon,

Chaisrithong

et al. 2023

J. Chem. Inf. Model.

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Graphene-based supercapacitors have emerged as a promising candidate for energy storage due to their superior capacitive properties. Heteroatom-doping is a method of improving the capacitive properties of graphene-based electrodes, but the optimal doping conditions and electrochemical properties are not yet fully understood due to the synergistic effects that occur. Many parameters, such as doping content, defects, specific surface area (SA), electrolyte, and more, could affect the capacitance (CAP). In this study, we use machine learning to solve these critical issues. We applied many models, such as Light Gradient Boost Machine, Extreme Gradient Boost, Polynomial Regression, Neural Network, Elastic Net, Lasso Regression, Ridge Regression, Random Forest, Support Vector Machine, K-Nearest Neighbors, Gradient Boost, AdaBoost, and Decision Tree, to find a suitable model for CAP prediction. Moreover, we enhance the prediction result by taking advantage of the top candidate model and creating a stacking concept (called “stacking models”). The SHAP value was used to identify the range of properties that affect CAP, and it was discussed in detail. Our results suggest that high-CAP graphene supercapacitors should have a large SA, with 4–5% nitrogen, 10–15% oxygen, high percentages of sulfur, a defect ratio close to 1, with acid electrolyte, and a low current density. These findings, along with the developed model and code, are expected to serve as a valuable computational tool for future electrochemical research from fundamental to applications.

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“…KHCO 3 is able to serve as a substitute for KOH due to being less corrosive [ 79 , 80 ]. In the case of NaHCO 3 , the activation mechanism is shown in Equations (7)–(11) [ 81 ]: 2NaHCO 3 → Na 2 CO 3 + H 2 O + CO 2 Na 2 CO 3 → Na 2 O + CO 2 Na 2 CO 3 +2C → 2Na + 3CO Na 2 O + C → 2Na + CO CO 2 + C → 2CO …”

Section: Pore Size Regulation Methodsmentioning

confidence: 99%

Advances in Micro-/Mesopore Regulation Methods for Plant-Derived Carbon Materials

et al. 2022

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In recent years, renewable and clean energy has become increasingly important due to energy shortage and environmental pollution. Selecting plants as the carbon precursors to replace costly non-renewable energy sources causing severe pollution is a good choice. In addition, owing to their diverse microstructure and the rich chemical composition, plant-based carbon materials are widely used in many fields. However, some of the plant-based carbon materials have the disadvantage of possessing a large percentage of macroporosity, limiting their functionality. In this paper, we first introduce two characteristics of plant-derived carbon materials: diverse microstructure and rich chemical composition. Then, we propose improvement measures to cope with a high proportion of macropores of plant-derived carbon materials. Emphatically, size regulation methods are summarized for micropores (KOH activation, foam activation, physical activation, freezing treatment, and fungal treatment) and mesopores (H3PO4 activation, enzymolysis, molten salt activation, and template method). Their advantages and disadvantages are also compared and analyzed. Finally, the paper makes suggestions on the pore structure improvement of plant-derived carbon materials.

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Large-scale single-step synthesis of wrinkled N–S doped 3D graphene like nanosheets from Tender palm shoots for high energy density supercapacitors

Cited by 34 publications

References 48 publications

Highly Ordered Micropores Activated Carbon from Long Fiber Biomass for High Energy Density Supercapacitors

Highly Ordered Micropores Activated Carbon from Long Fiber Biomass for High Energy Density Supercapacitors

Unlocking the Full Potential of Heteroatom-Doped Graphene-Based Supercapacitors through Stacking Models and SHAP-Guided Optimization

Advances in Micro-/Mesopore Regulation Methods for Plant-Derived Carbon Materials

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