ScholarWorks@경상국립대학교

초록

Barium plays a critical role in a wide range of technologies, from barium titanate-based dielectrics to specialty glass, phosphors, and radiation shielding. Unlike extensively studied barium-based oxides, Ba(OH)2 is not thoroughly explored as an electrocatalyst or energy storage material, and its intrinsic hydroxide chemistry remains under-investigated. In this study, Ba(OH)2 flakes are synthesized using a surfactant-assisted method at a low temperature (80 degrees C), providing a simple route to obtain uniform architectures. X-ray diffraction and X-ray photoelectron spectroscopy analyses confirm that amorphous Ba(OH)2 flakes undergo a phase transition into cubic barium oxide (Fm-3m) when annealed at 500 degrees C. Electrochemical evaluations including Tafel analysis and chronopotentiometry demonstrate excellent oxygen evolution reaction activity. Supercapacitor measurements reveal that pristine Ba(OH)2 flakes exhibit a superior capacitive performance compared with their annealed counterparts, which can be attributed to preserved hydroxide-derived pseudocapacitance. These findings indicate that morphology- and phase-engineered Ba(OH)2 are a versatile platform for advancing alkaline electrocatalysis and aqueous supercapacitor applications.

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