| 학회 |
한국재료학회 |
| 학술대회 |
2021년 가을 (11/24 ~ 11/26, 경주 라한호텔) |
| 권호 |
27권 2호 |
| 발표분야 |
C. 에너지 재료 분과 |
| 제목 |
Low-temperature synthesis of tetragonal phase of hafnium oxide using polymer-blended nanofiber precursor |
| 초록 |
Hafnium oxide (HfO2), which is known as hafnia, is considered one of the best materials for diverse future applications such as neuromorphic computing systems and optical coatings. Although tetragonal phase (t-phase) in the multiple crystallographic structures of HfO2 surpasses monoclinic phase (m-phase) which is the most common phase that can be formed at low temperature in physicochemical properties such as dielectric constant, bandgap, high resistance to corrosion and hardness, it is extremely challenging to stabilize t-phase below 1670 °C. Herein, we synthesized oxygen-deficient tetragonal hafnium oxide nanofibers (t-HfO2–x NFs) using the electrospinning technique, which included the polymer-blended precursors and a magnesium-thermic reaction at a low processing temperature (＜ 600 °C). The small grain size (＜10 nm) of the t-HfO2–x NFs and oxygen vacancies (Voxygen) synergistically stabilized t-phase in the nanofibrous structure. Oxygen reduction reaction (ORR) and oxygen evolution reaction (OER) performances of the t-HfO2–x NFs in alkaline and acid media were assessed as a potential application, which were higher than those of the m-HfO2 NFs. Our straightforward approach to make t-phase in HfO2-based materials can be widely applied for many future applications. |
| 저자 |
Ga-Yoon Kim1, Ji-Won Jung2, Na-Won Lee3, Won-Hee Ryu4
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| 소속 |
1Department of Chemical and Biological Engineering, 2Sookmyung Women's Univ., 3Department of Nuclear Science and Engineering, 4Massachusetts Institute of Technology |
| 키워드 |
Hafnium oxides; nanofibers; tetragonal phases; low-temperature synthesis; oxygen reduction and evolution reactions
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| E-Mail |
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