Dataset Information

Graphene with Covalently Grafted Amino Acid as a Route Toward Eco-Friendly and Sustainable Supercapacitors.

ABSTRACT: Eco-friendly, electrochemically active electrode materials based on covalent graphene derivatives offer enormous potential for energy storage applications. However, covalent grafting of functional groups onto the graphene surface is challenging due to its low reactivity. Here, fluorographene chemistry was employed to graft an arginine moiety via its guanidine group homogeneously on both sides of graphene. By tuning the reaction conditions and adding a non-toxic pore-forming agent, an optimum degree of functionalization and hierarchical porosity was achieved in the material. This tripled the specific surface area and yielded a high capacitance value of approximately 390 F g^-1 at a current density of 0.25 A g^-1 . The applicability of the electrode material was investigated under typical operating conditions by testing an assembled supercapacitor device for up to 30000 charging/discharging cycles, revealing capacitance retention of 82.3 %. This work enables the preparation of graphene derivatives with covalently grafted amino acids for technologically important applications, such as supercapacitor-based energy storage.

SUBMITTER: Vermisoglou EC

PROVIDER: S-EPMC8518929 | biostudies-literature | 2021 Sep

REPOSITORIES: biostudies-literature

ACCESS DATA

Publications

Graphene with Covalently Grafted Amino Acid as a Route Toward Eco-Friendly and Sustainable Supercapacitors.

Vermisoglou Eleni C EC Jakubec Petr P Bakandritsos Aristides A Kupka Vojtěch V Pykal Martin M Šedajová Veronika V Vlček Jakub J Tomanec Ondřej O Scheibe Magdalena M Zbořil Radek R Otyepka Michal M

ChemSusChem 20210818 18

Eco-friendly, electrochemically active electrode materials based on covalent graphene derivatives offer enormous potential for energy storage applications. However, covalent grafting of functional groups onto the graphene surface is challenging due to its low reactivity. Here, fluorographene chemistry was employed to graft an arginine moiety via its guanidine group homogeneously on both sides of graphene. By tuning the reaction conditions and adding a non-toxic pore-forming agent, an optimum deg ...[more]

PMID: 34288502

Similar Datasets

Project description:Carbon materials derived from marine waste have been drawing attention for supercapacitor applications. In this work, chitins from squid and prawn marine wastes were used as carbon precursors for further application as electrodes for energy storage devices. Chitins were obtained through a deproteinization method based on enzymatic hydrolysis as an alternative to chemical hydrolysis as commonly presented in the literature. The obtained porous carbons were characterized using a BET surface area analyzer to determine the specific surface area and pore size, as well as scanning electron microscopy (SEM) with energy dispersive X-ray analysis (EDX), transmission electron microscopy (TEM), Raman spectroscopy, attenuated total reflectance Fourier transform infrared (ATR-FTIR) spectroscopy, X-ray diffraction (XRD), and X-ray photoelectron spectroscopy (XPS), to characterize their morphology, composition, and structure. The electrochemical characterization was performed using a glassy carbon (GC) electrode modified with marine waste-based porous carbons as the working electrode through cyclic voltammetry and galvanostatic charge/discharge using ethaline, a choline chloride-based deep eutectic solvent (DES), as an eco-friendly and sustainable electrolyte. Squid and prawn chitin-based carbons presented a surface area of 149.3 m2 g-1 and 85.0 m2 g-1, pore volume of 0.053 cm3 g-1 and 0.029 cm3 g-1, and an associated specific capacitance of 20 and 15 F g-1 at 1 A g-1, respectively. Preliminary studies were performed to understand the effect of -OH groups on the chitin-based carbon surface with DES as an electrolyte, as well as the effect of aqueous electrolytes (1 mol L-1 sulphuric acid (H2SO4) and 1 mol L-1 potassium hydroxide (KOH)) on the capacitance and retention of the half-cell set up. It is provided, for the first time, the use of chitin-based carbon materials obtained through a one-step carbonization process combined with an eco-friendly DES electrolyte for potential application in energy storage devices.

Project description:ObjectivesThe current study aimed to investigate how regulatory frameworks and policies are used to support the use of sustainable medicines within the pharmaceutical sector.MethodsThe Scopus database was searched to retrieve papers. Advanced search tool of the Scopus online database was used focused on the papers that have the search query included in their titles. Data analysis incorporated bibliometric indicators like publication counts and trends, visualized through VOSviewer software version 1.6.20.Key findingsA total of 43 publications on Sustainable Medicines Use were found between 2000 and 2024. Leading countries in publication output on sustainable medicines use were United Kingdom, United States, India, Italy, Portugal, and Switzerland, indicating their collaborative relationships and publication volumes. A total of 92 institutions have been involved in research on Sustainable Medicines Use. Key institutions such as the Faculty of Engineering and the Laboratory for Process and Environmental Engineering, Lowell Center for Sustainable Production, Greiner Environmental Inc., and the University of Florence are prominently featured, indicating their significant contributions to research in this area. Key journals such as the "Journal of Cleaner Production," "Business Strategy and the Environment," "Chemical Engineering Transactions," "Benchmarking," and "Lecture Notes in Mechanical Engineering" are prominently featured. The retrieved articles have been cited an average count of 22.26. The overlay visualization created using VOSviewer suggest a shift towards exploring new drug categories, innovative approaches, and the commercial aspects of sustainability. Future research directions are likely to delve deeper into innovative methods and sustainable chemical practices (green chemistry), reflecting an emphasis on developing greener processes and products.ConclusionThis study offers a thorough analysis of the legislative and governmental strategies promoting the use of sustainable medicine. It offers important insights for promoting sustainability in the pharmaceutical industry by pointing out gaps, defining useful frameworks, and suggesting doable solutions. Achieving sustainable pharmaceutical practices that support worldwide environmental and public health objectives requires sustained research, policy development, and international cooperation. The area needs to keep developing and implementing sustainable methods like green chemistry to decrease environmental harm and improve sustainability. Furthermore, collaborations among academia, industry, and international organizations are essential to progress and interchange effective strategies.

Project description:Malva parviflora L. is an edible and medicinal herb containing mucilaginous cells in its leaves. Mucilage obtained from M. parviflora leaves (MLM) was extracted in distilled water (1:10 w/v) at 70 °C followed by precipitation with alcohol. Preliminary phytochemical tests were performed to assess the purity of the extracted mucilage. Results showed that the yield of mucilage was 7.50%, and it was free from starch, alkaloids, glycosides, saponins, steroids, lipids and heavy metals. MLM had 16.19% carbohydrates, 13.55% proteins and 4.76% amino acids, which indicate its high nutritional value. Physicochemical investigations showed that MLM is neutral and water-soluble, having 5.84% moisture content, 15.60% ash content, 12.33 swelling index, 2.57 g/g water-holding capacity and 2.03 g/g oil-binding capacity. The functional properties, including emulsion capacity, emulsion stability, foaming capacity and stability increased with increased concentrations. Micromeritic properties, such as bulk density, tapped density, Carr's index, Hausner ratio, and angle of repose, were found to be 0.69 g/cm3, 0.84 g/cm3, 17.86%, 1.22 and 28.5, respectively. Scanning electron microscopy (SEM) showed that MLM is an amorphous powder possessing particles of varying size and shape; meanwhile, rheological studies revealed the pseudoplastic behavior of MLM. The thermal transition process of MLM revealed by a differential scanning calorimetry (DSC) thermogram, occurring at a reasonable enthalpy change (∆H), reflects its good thermal stability. The presence of functional groups characteristic of polysaccharides was ascertained by the infrared (IR) and gas chromatography/mass spectrometry (GC/MS) analyses. GC revealed the presence of five neutral monosaccharides; namely, galactose, rhamnose, arabinose, glucose and mannose, showing 51.09, 10.24, 8.90, 1.80 and 0.90 mg/g of MLM, respectively. Meanwhile, galacturonic acid is the only detected acidic monosaccharide, forming 15.06 mg/g of MLM. It showed noticeable antioxidant activity against the DPPH (1,1-diphenyl-2-picrylhydrazyl) radical with an IC50 value of 154.27 µg/mL. It also prevented oxidative damage to DNA caused by the Fenton reagent, as visualized in gel documentation system. The sun protection factor was found to be 10.93 ± 0.15 at 400 µg/mL. Thus, MLM can be used in food, cosmetic and pharmaceutical industry and as a therapeutic agent due to its unique properties.

Dataset Information

Graphene with Covalently Grafted Amino Acid as a Route Toward Eco-Friendly and Sustainable Supercapacitors.

Publications

Graphene with Covalently Grafted Amino Acid as a Route Toward Eco-Friendly and Sustainable Supercapacitors.

Similar Datasets

OmicsDI is part of the ELIXIR infrastructure

Tweets