ABSTRACT
Antimony has a high theoretical capacity and suitable alloying/dealloying potentials to make it a future anode for potassium-ion batteries (PIBs); however, substantial volumetric changes, severe pulverization, and active mass delamination from the Cu foil during potassiation/depotassiation need to be overcome. Herein, we present the use of electrophoretic deposition (EPD) to fabricate binder-free electrodes consisting of Sb nanoparticles (NPs) embedded in interconnected multiwalled carbon nanotubes (MWCNTs). The anode architecture allows volume changes to be accommodated and prevents Sb delamination within the binder-free electrodes. The Sb mass ratio of the Sb/CNT nanocomposites was varied, with the optimized Sb/CNT nanocomposite delivering a high reversible capacity of 341.30 mA h g-1 (â¼90% of the initial charge capacity) after 300 cycles at C/5 and 185.69 mA h g-1 after 300 cycles at 1C. Postcycling investigations reveal that the stable performance is due to the unique Sb/CNT nanocomposite structure, which can be retained over extended cycling, protecting Sb NPs from volume changes and retaining the integrity of the electrode. Our findings not only suggest a facile fabrication method for high-performance alloy-based anodes in PIBs but also encourage the development of alloying-based anodes for next-generation PIBs.
ABSTRACT
Lignin-derived porous carbons have great potential for energy storage applications. However, their traditional synthesis requires highly corrosive activating agents in order to produce porous structures. In this work, an environmentally friendly and unique method has been developed for preparing lignin-based 3D spherical porous carbons (LSPCs). Dropwise injection of a lignin solution containing PVA sacrificial templates into liquid nitrogen produces tiny spheres that are lyophilized and carbonized to produce LSPCs. Most of the synthesized samples possess excellent specific surface areas (426.6-790.5 m2/g) along with hierarchical micro- and mesoporous morphologies. When tested in supercapacitor applications, LSPC-28 demonstrates a superior specific capacitance of 102.3 F/g at 0.5 A/g, excellent rate capability with 70.3% capacitance retention at 20 A/g, and a commendable energy density of 2.1 Wh/kg at 250 W/kg. These materials (LSPC-46) also show promising performance as an anode material in sodium-ion batteries with high reversible capacity (110 mAh g-1 at 100 mA g-1), high Coulombic efficiency, and excellent cycling stability. This novel and green technique is anticipated to facilitate the scalability of lignin-based porous carbons and open a range of research opportunities for energy storage applications.
ABSTRACT
The study's objective was to ascertain the general public's attitudes regarding the covid-19 vaccine in Pakistan. A cross sectional design and e-survey was conducted by 1647 general public. The sample was divided into two sections: urban (702) and rural (945). The majority of participants were between the ages of 18 and 45. The urban participants believe it is safe. Those who live in large cities and have a college degree or above have a positive attitude towards vaccines and do not find any religious reason not to be vaccinated. Individuals from rural areas seem to be skeptical of getting vaccines and they refuse to receive them. Individuals with little education, little information, and a low annual income express a strong mistrust of the vaccine's benefits.
Subject(s)
COVID-19 Vaccines , COVID-19 , Humans , Adolescent , Young Adult , Adult , Middle Aged , COVID-19 Vaccines/therapeutic use , Cross-Sectional Studies , Pakistan , COVID-19/epidemiology , COVID-19/prevention & control , Attitude , Surveys and QuestionnairesABSTRACT
In the title compound, C9H11NO5S, the O=S=O plane of the sulfonyl group is twisted at a dihedral angle of 52.54â (16)° with respect to the benzene ring. The dihedral angle between the carb-oxy-lic acid group and the benzene ring is 49.91â (16)°. In the crystal, C-Hâ¯O, N-Hâ¯O and O-Hâ¯O hydrogen bonds link the mol-ecules into (001) sheets.
