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

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.

• Periodical: Advances in Science and Technology (Volume 157)
• Pages: 9-15
• DOI: https://doi.org/10.4028/p-o26L7b
• Online since: September 2024
• Authors: Christine Ann Narag Macababbad*, Mary Donnabelle L. Balela
• Keywords: Cobalt Foam, Dynamic Hydrogen Bubble Template, Supercapacitor

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