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Summary: This study demonstrates that birch wood-based Spent Mushroom Substrate (SMS) can be converted into high-quality activated carbon (AC) with excellent performance in supercapacitor electrodes and removal of pollutants from water solutions.
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Summary: Enzyme-assisted pretreatment of cottonseed meal using cellulase can produce carbon materials with hierarchical porous structure and high oxygen content, exhibiting excellent electrochemical performance and energy density.
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Jianfei Tu et al.
Summary: In this study, activated carbon was prepared using American ginseng waste residue as the precursor. A high specific surface area and good pore distribution were achieved at a KOH/carbon ratio of 3:1, resulting in a high specific capacitance in a 6 M KOH electrolyte. The symmetrical aqueous supercapacitor constructed using this activated carbon exhibited high energy density, power density, and excellent electrochemical stability.
INTERNATIONAL JOURNAL OF ELECTROCHEMICAL SCIENCE
(2023)
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Huanxi Liao et al.
Summary: Regulating the porosity and understanding the preparation-structure-performance relationship are crucial for the development of high-performance carbon-based supercapacitors. In this study, N-doped honeycomb-like three-dimensional porous carbon was successfully fabricated from Equisetum ramosissimum Desf. weeds using a KOH-assisted hydrothermal pre-treatment and pyrolysis strategy. The electrochemical properties were optimized by tuning the KOH concentration and carbonization temperature to control the pore structure. Three types of pore structures were explored, and the carbon sample with the optimized pore structure exhibited a high specific capacitance of 427 F g-1 in the aqueous KOH electrolyte. When assembled into a symmetric supercapacitor device, it achieved an energy density of 30.9 Wh kg-1 at a power density of 500 W kg-1. The results suggest that a moderate Vmirco/Vmeso ratio and rational pore size regulation contribute to the excellent rate capability and high specific capacitance.
APPLIED SURFACE SCIENCE
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Shrinath Bhat et al.
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Qunchao Yin et al.
Summary: Plant ash and eggshells are used as natural activation agent and template to prepare N, O, and S codoped carbon with porous structure from biomass. The resulting carbon material exhibits high specific capacitance, long-term cycling life, and high energy density. These findings suggest that using environmentally friendly agents to synthesize porous carbon from biomass can provide a cost-effective and sustainable method for the development of electroactive materials.
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Jie Li et al.
Summary: This study attempted to use palm kernel shells to prepare high-performance porous carbon for supercapacitors, aiming to expand the application and value of palm kernel shells. The results showed that the two-step method produced porous carbon with larger specific surface area and higher specific capacitance compared to the one-step method. Additionally, self-doping of O, P, S was achieved in the hierarchical porous carbon prepared by the two-step method. The assembled supercapacitor achieved a high energy density.
DIAMOND AND RELATED MATERIALS
(2023)
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Summary: Using coal tar pitch (CTP) and KOH as carbon source and activator respectively, the study investigates the effects of different activation temperatures on the hierarchy and performance of carbon electrodes in supercapacitors. The results demonstrate that ACTP-3-600 activated at 600 degrees C shows higher specific surface area, pore volume, and superior performance compared to other temperatures. The symmetric supercapacitor assembled with it achieves an energy density of 20.2 Wh kg-1 (at a power density of 450.0 W kg -1) in 1 M Na2SO4 electrolyte, with a capacitance retention rate of 91.2 % after 10,000 cycles. The prepared method offers a simple and cost-effective approach to high-performance hierarchical porous carbon materials.
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Sha Liu et al.
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Wenjie Wu et al.
Summary: In this study, seedless wintersweet-fruit-shell was used as a carbon precursor for the production of activated carbon labeled as WFC. Different proportions of KOH were used to activate WFC, resulting in WFC-X (X = 1, 2, 3, 4 representing mass ratios of KOH to WFC). The morphology, structure, and crystallization of WFC and WFC-X were characterized using SEM, TEM, XRD, and Raman. The electrochemical properties of WFC and WFC-X were investigated, with WFC-2 showing the best performance. It exhibited a high specific surface area (1489.31 m2 g-1) and a specific capacitance of 433 F g-1, retaining 95.20% capacitance after 5000 charge and discharge cycles. WFC-2 was assembled into a symmetrical supercapacitor, which demonstrated high capacitance retention rate and coulomb efficiency after 5000 cycles in different electrolytes. WFC-2 shows promise as an electrode material for supercapacitors due to its excellent electrochemical properties.
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Jiaqi Wu et al.
Summary: In order to develop environmentally friendly and high-performance supercapacitors, the research focuses on finding low-cost, high-capacitance renewable electrode materials. In this study, celery leaves, a common biomass vegetable, were used to prepare activated carbon for supercapacitors with high voltage and high capacity. The hierarchically porous carbon materials derived from celery leaves showed a high specific capacitance of 753.0 F g(-1) at 0.5 A g(-1) and a capacity retention of 96.7% even after 5,000 cycles, indicating excellent electrochemical performance.
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B. Shaku et al.
Summary: This study presents the conversion of marula nutshell waste into nitrogen-doped activated carbon (N-ACs) for supercapacitor electrode material. The N-ACs demonstrated high surface area and porosity, resulting in excellent electrochemical performance in KOH and KNO3 electrolytes. The material achieved remarkable energy and power densities in 2.5 M KNO3 electrolyte, making it a promising energy storage material for supercapacitors.
ELECTROCHIMICA ACTA
(2023)
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Ruiya Zhao et al.
Summary: The conversion of biomass waste into porous carbon with unique properties has received much attention in energy storage applications. In this study, abutilon theophrasti stem-derived activated carbon (ATSAC) was synthesized with N and O co-doping through high-temperature carbonization and KOH activation. The optimized ATSAC-6 anode showed excellent electrochemical performance, including high specific capacitance, outstanding rate performance, and excellent cycling stability. Furthermore, symmetric supercapacitors with different electrolytes were investigated and demonstrated remarkable energy density and specific capacitance.
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Chemistry, Physical
Zhichao Jiao et al.
Summary: The exploration of desirable structure is important for energy storage materials. The morphology design of the electrode materials greatly affects the electrochemical performance. In this study, controllable synthesis of cobalt vanadate with various structures on 3D urchin-like CoO microspheres is achieved. The optimized cobalt vanadate supported by CoO exhibits superior energy storage capacity and excellent capacitance retention, showing promise as a supercapacitor electrode material.
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(2023)
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Ceramics International
(2023)
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Rui Yang Hu et al.
Summary: Recent studies have shown that bimetallic carbide, due to its abundant active sites, high conductivity, and electrochemical stability, is a promising electrode material for supercapacitors. By combining bimetallic carbides with other advanced materials such as graphene, porous carbon, or carbon nanotubes (CNTs), the electrochemical properties of the electrode can be greatly enhanced. In this study, Fe3Mo3C/Mo2C@CNTs composite material was synthesized for the first time using hydrothermal and high-temperature carbonization methods. The Fe3Mo3C/Mo2C@CNTs nanoparticles carbonized at 800℃ exhibited the best electrochemical performance, with a specific capacitance of 196.3 F g-1 at a scanning rate of 10 mV s-1 (202.3 F g-1 at 1 A g-1). An asymmetric supercapacitor assembled with Fe3Mo3C/Mo2C@CNTs and NiCo2O4 electrode achieved an energy density of 39.9 Wh Kg-1 at a power density of 1800 W Kg-1, with a capacitance retention rate of 73.9% after 4000 cycles. Overall, Fe3Mo3C/Mo2C@CNTs shows significant potential as a negative electrode material for supercapacitors in the field of electrochemical energy storage.
JOURNAL OF ENERGY STORAGE
(2023)
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Ganesh Dhakal et al.
Summary: Three-dimensional lotus calyx-derived activated carbon (3D-LCAC), prepared by one-step carbonization and activation, shows remarkable electrochemical performance and high cycling stability in supercapacitor applications, making it a promising candidate as a high-performance electrode material.
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Liangcai Wang et al.
Summary: The specific surface area and pore-wall thickness together determine the specific capacitance of porous carbon materials, while volumetric surface area can be used as a general predictor of specific capacitance at low current densities.
JOURNAL OF MATERIALS RESEARCH AND TECHNOLOGY-JMR&T
(2022)
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Qinghai Ma et al.
Summary: In this study, hierarchical multi-heteroatoms co-doped porous carbon materials were successfully prepared by carbonization and activation of tea waste. The obtained MHPC exhibits excellent supercapacitance and capacitance retention, making it a valuable guideline for the development of high-performance energy storage devices.
JOURNAL OF ENERGY STORAGE
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Shaobin Li et al.
Summary: A novel composite electrode material NiCoC/O-NiCoAl LDH with a unique nanoflower-like structure and multiple surface element states was successfully synthesized. The electrode material exhibited excellent specific capacitance and cycling stability, suggesting its potential applications in green energy storage.
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Meng Zhou et al.
Summary: This study presents a green method to prepare porous active carbon from walnut septum as electrode materials for supercapacitors. The effects of chemical etching reagent on the microstructure and specific capacitance of the porous carbon are explored. The results show that walnut septum is a promising precursor for activated carbons, and the large mesoporosity after activation effectively boosts the electrochemical properties of supercapacitors.
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Guangning Wang et al.
Summary: In this study, a high-capacity negative electrode was designed and prepared to improve the performance of supercapacitors. By improving conductivity and cycling stability, as well as preventing restacking, the performance of the capacitor was enhanced. A supercapacitor device with ultrahigh energy density and power density was fabricated by combining the negative electrode with a positive electrode. This research has great potential for practical applications.
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Jiaojiao Zheng et al.
Summary: In this work, hierarchical porous carbon materials are synthesized by carbonizing a mixture of starch rich biomass precursor and potassium citrate. The addition of potassium citrate greatly enhances the specific surface area of carbon material, and the resulting APCs-750 exhibits excellent capacitance performance, rate performance, and stability.
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Rui Wang et al.
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Review
Energy & Fuels
Pantrangi Manasa et al.
Summary: This review focuses on recent research progress in biomass-derived carbon electrode materials for supercapacitor applications, including materials derived from plants, fruits, vegetables, animal waste, and microorganisms. The review also discusses various synthesis methods for converting and activating biomass waste. Furthermore, it provides a summary and future research trends in this field.
JOURNAL OF ENERGY STORAGE
(2022)
Review
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Lu Luo et al.
Summary: This article provides an overview of the activation methods and mechanisms used in various biomass activated carbons, as well as a review of their recent application in electrochemical supercapacitors. It discusses the effects of activation treatment on the morphology and pore structure of activated carbon materials and summarizes the impact of different factors on supercapacitor performance. The article also summarizes the current state of research, future development prospects, and challenges in promoting the application of biomass activated carbons in various fields.
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(2022)
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Rika Taslim et al.
Summary: Biomass-based activated carbon derived from Moringa oleifera leaves has been developed as a novel electrode material with high conductivity, large porosity, and outstanding stability. It shows optimum performance as a symmetric supercapacitor with high specific capacitance and low internal resistance in aqueous electrolyte solutions.
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Tianxiang Jin et al.
Summary: A daylily-derived porous carbon material with high specific surface area and heteroatom content has been successfully prepared by a simple carbonization method. It shows remarkable specific capacitance and excellent cycling stability, making it suitable for high-performance supercapacitors.
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Mousumi Bora et al.
Summary: In this study, an improved activated carbon material was created by blending waste coconut shell-based activated carbon and low-grade coal powder. The mixed-blend material exhibited excellent electrochemical performance and a prototype supercapacitor using this material was able to light an LED for an hour.
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