| 학회 | 한국재료학회 |
| 학술대회 | 2021년 가을 (11/24 ~ 11/26, 경주 라한호텔) |
| 권호 | 27권 2호 |
| 발표분야 | E. 환경/센서 재료 분과 |
| 제목 | Enhanced piezocatalytic activity of BaTiO3 nanoparticles by engineering surface oxygen vacancies |
| 초록 | Piezocatalysis has been gathering considerable attention as advanced technology for alleviating the environmental crisis due to its expediency to convert the various mechanical energy forms in nature, e.g, ultrasonic, wind, atmosphere pressure and tide into electrochemical energy. Barium titanate (BaTiO3) nanoparticle is actively studied, because it satisfies the requirements as a piezocatalyst such as non-toxicity, cost-effectiveness, and high piezoelectric potential. However, many works have been proved that the internal charges of BaTiO3 only contributed to creating a piezoelectric potential, but not able to become free carriers capable of the redox reaction at the surface. Therefore, due to its low free carrier concentration, the piezocatalysis of BaTiO3 has required an ultrasonic system that can thermally excited charge carriers by the collapse of cavities. Doping is a representative technique to modulate the carrier concentration of material but, complicated processes and conditions are demanded in the doping process to obtain the doped metal oxides without undesired impurity phase and property deterioration by inhomogeneous distribution of foreign elements. On the other hand, the utilization of oxygen vacancy has recently emerged as advanced technology to extremely maneuvering the physicochemical properties of a material without an unwanted impurity phase compared with doping process. . However, there are a few works to synthesize the black BaTiO3-x and no work investigates the piezocatalytic performance of black BaTiO3-x nanoparticles. In this study, the oxygen-deficient black BaTiO3-x nanoparticle was successfully synthesized by the simple solid-state reaction, improving the diffusivity of Ba2+ and O2- ions during the reaction by using the defective raw materials. The physicochemical properties were investigated by various tools and then the efficiency of oxygen vacancies was discussed for improving the piezocatalytic performance in terms of free carrier concentration. |
| 저자 | 지명준, 김정현, 류철희, 박미정, 전희연, 이영인 |
| 소속 | 서울과학기술대 |
| 키워드 | Oxygen-deficient BaTiO<SUB>3-x</SUB>; Piezocatalysis; Environmental remediation; Solid-state reaction; Black TiO<SUB>2-x</SUB> |
