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19. Electrodeposition and Characterization of Cobalt (Co) Foam with Food-Grade Agar via Dynamic Hydrogen Bubbling Template (DHBT)

Author

Macababbad, Christine Ann Narag and Balela, Mary Donnabelle L.

Abstract

Supercapacitors exhibit both high energy and power densities that facilitate the discharge of energy rapidly, but their energy density is inferior to batteries. A porous electrode maximizes the charge capacity of supercapacitors making metal foams widely researched materials. With the hydrogen evolution activity, superior reversible redox reactions, and excellent cyclic stability of cobalt (Co)-based foam, it could serve as an excellent active material and current collector for pseudocapacitor. Dynamic hydrogen bubbling templating (DHBT) is a low-cost, and straightforward electrodeposition technique for synthesizing metal foams. This study synthesized Co foams with food-grade agar as an additive via DHBT. The effect of food-grade agar concentration and current densities were studied wherein the result showed that higher concentration of food-grade agar and current densities led to smaller and more uniform pore sizes. Co foam 0.3% food-grade agar electrodeposited at 2.5 A/cm2 have the most uniformed structure. The cobalt foam is then oxidized in ambient conditions and employed as both active material and current collector. Co foam with 0.3% agar synthesized at 2.5 A/cm2 attained a high capacitance from the discharge curves at 211.525 Fcm-2.

Published
2024
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30. Conductive Inks with Chemically Sintered Silver Nanoparticles at Room Temperature for Printable, Flexible Electronic Applications

Author

Rezaga, Bethel Faith Y. and Balela, Mary Donnabelle L.

Abstract

Conductive inks composed of chemically sintered silver (Ag) nanoparticles were prepared. The enlargement of particle size was accompanied by the increase in conductivity of the Ag nanoparticle ink. The resistance of the as-prepared and sintered Ag nanoparticles printed on different substrates was measured, and results showed that the formulated conductive ink works best on glossy paper. This is due to the compatibility of the conductive ink with the porosity and surface roughness of the glossy paper. The conductive ink formulation was also used as printer ink, and results showed a decrease in resistance as the printing pass was increased.

Published
2024
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37. Natural hematite-ZnO nanocomposite for the adsorptive removal of methyl orange in aqueous solution.

Author

Abas, Paulo Martin, Galzote, Aries Elijah, and Balela, Mary Donnabelle L.

Subjects
AQUEOUS solutions, HEMATITE, NANOCOMPOSITE materials, HYDROTHERMAL synthesis, ZINC oxide, NANORODS
Abstract

In this work, natural hematite, a mixture of mostly quartz (SiO2) and α-Fe2O3, was evaluated for the removal of methyl orange in an aqueous solution. To introduce new adsorption sites, ZnO nanostructures were then grown on the surface of the natural hematite by hydrothermal synthesis. ZnO nanosheets and nanorods were formed on the surface of the hematite powder. This is different from the rice-like structures of ZnO prepared without the natural hematite. The hematite-ZnO nanocomposite with 20% ZnO showed the highest removal of about 48%. This is significantly higher than the performance of pure hematite and pure ZnO. [ABSTRACT FROM AUTHOR]

Published
2023
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46. Kapok-cotton Carbon Sponges for Oil Recovery

Author

Datiles, Wayne Christian P, primary, Herrera, Marvin U, additional, Manalo, Ronniel D, additional, Maguyon-Detras, Monet Concepcion, additional, Futalan, Cybelle Concepcion M, additional, and Balela, Mary Donnabelle L, additional

Published
2021
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