Study on the Synthesis and Electrochemical Properties of Nitrogen-Doped Graphene Quantum Dots DOI Open Access
Yongbo Wang, Yanxiang Wang, Dongming Liu

et al.

Materials, Journal Year: 2024, Volume and Issue: 17(24), P. 6163 - 6163

Published: Dec. 17, 2024

Nitrogen-doped graphene quantum dots (N-GQDs) are widely used in biosensing, catalysis, and energy storage due to their excellent conductivity, high specific surface area, unique size effects, optical properties. In this paper, we successfully synthesized N-GQDs using a facile hydrothermal approach investigated the effects of different temperatures times on morphology structure N-GQDs. The results indicated that gradually increased they eventually aggregated into fragments with increasing temperature or reaction time. Notably, at 180 °C for 6 h exhibited most uniform size, an average diameter approximately 3.48 nm, height 5–6 layers, as well favorable fluorescence Moreover, contained abundant oxygen- nitrogen-containing functional groups, which could provide numerous active sites electrode reactions. assembled typical pseudocapacitive behavior exceptional electrochemical performance, achieving capacitance 102 F g−1 current density 1 A g−1. 10,000-cycle test, demonstrated cycling stability retention rate 78.5%, laid foundation practical application electrode. This work applied supercapacitors, offering new insights development field.

Language: Английский

Graphene Doped with Transition Metal Oxides: Enhancement of Anode Performance in Lithium-Ion Batteries DOI Creative Commons
Jun Du, Liwei Liao,

Binbin Jin

et al.

Metals, Journal Year: 2025, Volume and Issue: 15(4), P. 387 - 387

Published: March 29, 2025

In recent years, transition metal oxides (TMOs) have emerged as promising candidates for anode materials in lithium-ion batteries (LIBs) owing to their high theoretical capacities. Regrettably, most TMOs exhibit poor electronic/ionic conductivity and undergo substantial volume expansion during the lithiation/delithiation processes. this study, an electrostatic spinning method using polyacrylonitrile, graphene, iron(III) acetylacetonate precursors was employed synthesize Fe3O4@G/C composite through carbon coating graphene doping. The composition, phase structure, morphology of were thoroughly investigated. electrochemical performance a battery evaluated continuous charge–discharge cycling test. After 100 cycles at current density 0.1 A/g, specific capacity material remained 595.8 mAh/g. Additionally, incorporation leads reduction electron orbital energy Fe, which verified by comparing states (DOS) before after Simultaneously, CoO@G/C NiO@G/C composites further demonstrates that doping with can enhance anodes batteries. We anticipate design concept will open new avenues development propel adoption practical applications.

Language: Английский

Citations

0
Electrochemical synergies between double layer capacitance and faradic redox pseudocapacitance in (FeCoCrMnNi)3O4/C electrode DOI
Jie Feng,

Yi Yin,

Bi Chen

et al.

Ionics, Journal Year: 2025, Volume and Issue: unknown

Published: April 4, 2025

Language: Английский

Citations

0
N- and O- Doped Porous Carbon Nanosheets Prepared from Templating Methodology for Supercapacitors DOI Open Access

Baoning Zhu,

Jinghua Liu,

Qijun Zhong

et al.

Polymers, Journal Year: 2025, Volume and Issue: 17(9), P. 1198 - 1198

Published: April 27, 2025

Heteroatom-doped biomass-derived porous carbon materials show promising applications as electrode components in energy storage technologies. In this investigation, we present a template-assisted pyrolysis procedure to fabricate nitrogen–oxygen dual-doped materials. Firstly, the precursor and template initially polymerized form white jelly-like gel, which was freeze-dried create nanosheet-assembled structure. Subsequent high-temperature induced formation of structure with nanosheet morphology. The CMC-ZnK sample derived from dual potassium citrate zinc acetate pyrolyzed at 800 °C exhibits optimal electrochemical performance, delivering specific capacitance 271.4 F g−1 1 A three-electrode configuration, along outstanding rate capability (90% retention, 244 10 g−1). constructed supercapacitor demonstrated an density 6.5 Wh kg−1 under power 500 W kg−1. Furthermore, study systematically investigated performance variation mechanisms different temperatures, revealing relationship between structural composition temperature biomass

Language: Английский

Citations

0
Recent Advances in the Application of MOFs in Supercapacitors DOI Creative Commons
Christos Argirusis,

Maria‐Eleni Katsanou,

Niyaz Alizadeh

et al.

Batteries, Journal Year: 2025, Volume and Issue: 11(5), P. 181 - 181

Published: May 2, 2025

As the need for energy is constantly increasing and in long term fossil fuels are not an option because of global overheating due to greenhouse effect, alternative production concepts such as photovoltaics, wind energy, IR harvesters etc., have been developed. The problem that renewable sources stochastic, therefore there a electrical storage either rechargeable batteries or high-performance supercapacitors. In this respect, novel materials needed meet challenges related these technologies. Metal–organic frameworks (MOFs) represent highly promising applications supercapacitors (SCs) thus recent years become essential clean efficient conversion storage. present numerous benefits electrocatalysts, electrolyte membranes, fuel materials; they exhibit exceptional design versatility, extensive surface-to-volume ratios, permit functionalization with multivalent ligands metal centers. Here we overview MOF-based using This review deals advances Finally, outlook on future use restrictions MOFs electrochemical applications, focus supercapacitors, given.

Language: Английский

Citations

0
A comprehensive review on biochar for electrochemical energy storage applications: an emerging sustainable technology DOI Creative Commons

P.C. Jobe Prabakar,

Koc Mustafa Mert,

L. Muruganandam

et al.

Frontiers in Energy Research, Journal Year: 2024, Volume and Issue: 12

Published: Nov. 1, 2024

Energy is an essential factor in many activities. The need to generate adequate energy from various sources becoming increasingly crucial meeting the rising needs of world’s population. Nevertheless, storage plays a vital role demand, notably since affordable yet eco-friendly should meet it. Several recommendations were provided overcome this limitation, with increasing emphasis on sources. However, ecologically sustainable, and effective systems are primary focus. Carbonaceous substances produced by pyrolyzing biomass, such as biochar, have recently gained attention sustainable material potential be used electrochemical technologies. It attractive option for electrode materials supercapacitors, batteries, hydrogen devices due its abundant availability distinct physicochemical characteristics, which include, excellent electric conductivity, tuneable surface functional groups, densely porous structure, high area, porosity, chemical stability, pore volume. This review addresses performance, production, characterization based biochar developments. investigates choice feedstock, preparation routes, controlling parameters producing activation process, post-treatment techniques that affect structural characteristics device fabrication detail. Additionally, it reveals recent developments modification methods like doping, activation, hybridization improved material’s capacity storage. Furthermore, in-depth discussion environmental impacts biochar-based elaborated, along opportunities challenges presented study.

Language: Английский

Citations

3
Circular Economy of Construction and Demolition Waste for Nanocomposite Cement: XRD, NMR, Vickers, Voltammetric and EIS Characterization DOI Creative Commons

Roxana Rada,

Daniela Lucia Manea, S. Rada

et al.

Nanomaterials, Journal Year: 2024, Volume and Issue: 14(15), P. 1239 - 1239

Published: July 23, 2024

In this paper, we present the structural, mechanical and electrical properties of composite cement materials that can be widely used as substituent for cement. We start with characterization a sample using an analysis X-ray diffraction (XRD) nuclear magnetic resonance (NMR) spectra. The measurements Vickers hardness, cyclic sweep linear voltammetry electrochemical impedance spectroscopy (EIS) were also recorded. This study compared effect different nanocomposites added to on mitigation alkali–silica reaction, which is responsible swelling, cracking deleterious behavior material. enhancement in hardness was more pronounced materials. contrast, values decreased containing mortar control sample, suggesting long-term performance compromised. order obtain information about bulk resistance material, data employed. results suggest materials, there improvement resistance, attributed lower amounts cracks swelling due expansion. reduction suggests formation microcracks, cause aging degradation intersection arcs EIS spectrum mixed gradually increased by alkaline exposure up 21 days finally shifted towards low value high frequency increase 28 days.

Language: Английский

Citations

2
Synthesis of Cellulose Acetate Butyrate Microspheres as Precursor for Hard Carbon-Based Electrodes in Symmetric Supercapacitors DOI Open Access
Johanna Fischer, Katrin Thümmler, Igor Zlotnikov

et al.

Polymers, Journal Year: 2024, Volume and Issue: 16(15), P. 2176 - 2176

Published: July 30, 2024

Cellulose microspheres have a wide range of applications due to their unique properties and versatility. Various preparation methods been explored tailor these for specific applications. Among methods, the acetate method using cellulose is well known. However, replacement group through butyrate significantly extends variety morphological properties. In present work, based on are being developed with modified characteristics in terms particle size, porosity, surface morphology inner structure microspheres. While predominantly porous, prepared from mainly filled or contain several smaller Carbon materials exhibit high area 567 m

Language: Английский

Citations

2
Environmental Sustainability Based on Zirconium Dioxide Utilization in Non-Conventional Energy Applications DOI Open Access
Ecaterina Matei,

Anca-Andreea Șăulean,

Mirela Petriceanu

et al.

Environments, Journal Year: 2024, Volume and Issue: 11(12), P. 265 - 265

Published: Nov. 22, 2024

The increasing demand for sustainable energy solutions has prompted a significant interest in non-conventional sources, leading to the development of innovative materials that can enhance conversion and storage efficiency. This review paper explores pivotal role zirconium dioxide (ZrO2) industrial applications related technologies, highlighting its contributions circular economy. We discuss various synthesis methods ZrO2, including top-down bottom-up approaches, elucidating how these techniques influence material’s properties applicability. Furthermore, we examine unique characteristics nano-ZrO2 transformative potential systems. By synthesizing current research findings, this underscores significance ZrO2 promoting practices advancing economy through material reuse recycling strategies. insights provided herein aim inform future directions applications, ultimately fostering more landscape.

Language: Английский

Citations

2
Application of Biochar-Based Materials for Effective Pollutant Removal in Wastewater Treatment DOI Creative Commons

Mingkun Han,

Ziyang Liu, Shiyue Huang

et al.

Nanomaterials, Journal Year: 2024, Volume and Issue: 14(23), P. 1933 - 1933

Published: Nov. 30, 2024

With the growth of global population and acceleration industrialization, problem water pollution has become increasingly serious, posing a major threat to ecosystem human health. Traditional treatment technologies make it difficult cope with complex pollution, so scientific community is actively exploring new efficient methods. Biochar (BC), as low-cost, green carbon-based material, exhibits good adsorption catalytic properties in due its porous structure abundant active functional groups. However, BC's pure or capacity limited, researchers have dramatically enhanced performance through modification means, such loading metals heteroatoms. In this paper, we systematically review recent applications BC modified materials for adsorption, Fenton-like, electrocatalytic, photocatalytic, sonocatalytic systems, discuss their adsorption/catalytic mechanisms. most research field at laboratory simulation stage still needs much improvement before can be applied large-scale wastewater treatment. This improves understanding pollutant mechanisms BC-based materials, analyzes limitations current studies, investigates future directions.

Language: Английский

Citations

2
Impact of Mechanochemical Activation (MChA) on Characteristics and Dye Adsorption Behavior of Sawdust-Based Biocarbons DOI Open Access
Barbara Wawrzaszek, B. Charmas, Katarzyna Jedynak

et al.

Materials, Journal Year: 2024, Volume and Issue: 17(18), P. 4458 - 4458

Published: Sept. 11, 2024

The increase in environmental pollution due to the development of industry and human activity has resulted intensive research on possibility its purification. A very effective method is pollutants’ adsorption from air water environment. For be effective, materials with a specific structure well-developed surface decorated numerous functionalities, e.g., biocarbons (BC), are necessary. An activating mechanochemical milling, an environmentally friendly procedure. This paper describes using activation (MChA) non-porous develop porosity for their use processes pollutant adsorption. BC was characterized based N2 adsorption, thermogravimetry (TGA), SEM/EDS imaging, Fourier (ATR-FTIR) Raman spectroscopies, as well titration Boehm determination zeta potential. capacity methylene blue (MB) studied. It proven that solvent-free MChA made it possible obtain microporous biocarbons, causing area pore volume generation oxygen functionalities. had predominantly acidic (mainly carboxylic) or basic functionalities exhibited amorphous structure. proved adsorbing MB aqueous solutions.

Language: Английский

Citations

1