Journal of the Korean Crystal Growth and Crystal Technology (한국결정성장학회지)

The Korea Association of Crystal Growth (한국결정성장학회)
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Fabrication and thermal stability of flower-like CeO2 with high surface area via anisotropic crystallization of carbonate precipitation

탄산염 침전 전구체의 결정 이방성 제어를 통한 고 비표면적 flower-like CeO2 분말의 제조 및 고온 안정성 평가

  • Kim, Hanbit (Energy Materials Division, Korea Institute of Ceramic Engineering & Technology (KICET)) ;
  • Shin, Tae Ho (Energy Materials Division, Korea Institute of Ceramic Engineering & Technology (KICET))
  • 김한빛 (한국세라믹기술원 에너지소재본부) ;
  • 신태호 (한국세라믹기술원 에너지소재본부)
  • Received : 2019.07.11
  • Accepted : 2019.08.12
  • Published : 2019.08.31
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Abstract

Cerium oxide ($CeO_2$, often called as Ceria) is one of the valuable rare earth oxide materials, which has been widely used for high temperature applications such as solid oxide fuel cells, automotive three-way catalysts and oxygen storage capacity. Considering those application, it is important to improve high redox and thermal stability with high surface morphology because the high surface area of $CeO_2$ could improve the catalytic reactivity at high temperature conditions. Herein we successfully fabricated hierarchical flower-like $CeO_2$ deposited via controlling pathway of precipitation reaction to supply carbonate ion lead to the flower-like morphology. The hexagonal lattice system of precipitated precursor shows better thermal stability then orthorhombic one during thermal cycling condition.

산화세륨($CeO_2$)는 고체산화물연료전지, 자동차 삼원 촉매, 산소 캐패시터 소재 등의 고온환경에서 구동되는 촉매 응용분야에 널리 활용되고 있으며 중요한 희토류 산화물 중에 하나이다. 고온 환경에서 $CeO_2$의 우수한 촉매 활성을 유지하기 위하여 초기 합성단계에서 높은 비표면적을 갖는 미세구조제어 연구와 나노 미세구조가 고온 열 사이클과 산화-환원 사이클 변화에서 안정하도록 하는 연구가 필요하여 많은 연구가 진행되고 있다. 따라서 본 연구에서는 탄산염 침전법의 전구체 결정화 단계에서의 이방성을 정밀 제어하여 고 비표면적의 flower-like $CeO_2$를 성공적으로 합성할 수 있었다. 또한, 서로 다른 탄산염이온 침전제의 침전 반응 경로 제어를 통한 침전 수화물 전구체의 이방적 결정 특성으로부터 최종 고 비표면적 $CeO_2$ 산화물의 미세구조 제어와 고온 안정 제어를 확인하고 특성을 평가하였다.

Keywords

References

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