122nd General Meeting of the KCS

Type Poster Presentation
Area Material Chemistry
Room No. Grand Ballroom
Time 10월 18일 (목요일) 11:00~12:30
Code MAT.P-375
Subject Fabrication of Porous β-Bi2O3 Nanoplates and Their Enhanced Photocatalytic Activity and Capacitance Behavior
Authors Seung Heon Lee, Tae Ho Kim, Myong Yong Choi, Kang Yeol Lee1,*
Department of Chemistry, Gyeongsang National University, Korea
1Research Institute of Natural Science, Gyeongsang National University, Korea
Abstract Direct phase transformation of bismuth complex nanoplates to β-Bi2O3 ones was induced by low-temperature annealing at 250°C. The β-Bi2O3nanoplates showed a nanoporous structure, which retained the tetragonal framework of the original bismuth complex nanoplates while releasing gas molecules produced during thermal decomposition, thereby enabling the formation of nanoporous structures extending through the nanoplate surfaces. The sizes, structures, optical properties, and composition distributions of the synthesized bismuth-organic complex and porous β-Bi2O3 nanoplates were characterized by scanning electron microscopy, energy-dispersive x-ray spectroscopy, infrared spectroscopy, UV-vis diffuse reflectance spectroscopy, and x-ray diffraction. The porous β-Bi2O3 nanoplates prepared by low-temperature annealing at 250°C for 3, 5, and 7 h showed photocatalytic activities for the photodegradation of methylene blue. The porous β-Bi2O3 nanoplates annealed for 7 h showed the best photocatalytic activity. To confirm the nanoplate photocatalyst cytotoxicity, cell viability tests were performed by treating HEK293 normal kidney cells with the porous β-Bi2O3 nanoplates. The porous β-Bi2O3 nanoplates are also characterized as negative electrode materials for supercapacitor application by cyclic voltammetry (CV) and galvanostatic charge/discharge measurements. Due to the unique architecture, the porous β-Bi2O3 nanoplates exhibit a high capacitance of1685 F g−1 , as well as good cycling stability.
E-mail k9876047266@gnu.ac.kr