| 학회 |
한국재료학회 |
| 학술대회 |
2021년 가을 (11/24 ~ 11/26, 경주 라한호텔) |
| 권호 |
27권 2호 |
| 발표분야 |
C. 에너지 재료 분과 |
| 제목 |
Black Tungsten oxide Nanofiber as a Robust Support for Metal Catalysts: High Catalyst Loading for Electrochemical Oxygen Reduction |
| 초록 |
Black valve metal oxides with a little oxygen vacancies have been known to be promising for various industrial applications, such as in photocatalysis, gas sensing, and rechargeable batteries for not only their considerable fractions of low-valent metal species and oxygen vacancies but also their high conductivity and stability. Herein, the nanofiber (NF) of black oxygen-deficient tungsten trioxide (WO3-x) is suggested as a functional and sturdy support for the direct growth of a nanoparticle such as platinum catalyst for oxygen reduction reaction (ORR). The poorly crystallized black WO3-x NFs are synthesized by electrospinning the W precursor and NFs followed by their thermic reaction at a low processing temperature (650 °C). The black WO3-x NFs has acceptable electrical conductivity owing to its amouphous structure and improved band gap. Remarkably, the oxygen-deficient surface (surface O/W: 2.44) facilitates the growth of small Pt nanoparticles, which resist aggregation, as confirmed by structural characterization and computational analysis. The Pt-loaded black WO3-x NFs outperforms the Pt-loaded white WO3-x NFs which is crystalline in the both electrochemical ORR activity and the accelerated durability test. This study shows the possibility of using oxygen-deficient metal oxides as supports for various electrocatalysts, and further increase the versatility of oxygen-deficient metal oxides. |
| 저자 |
Ga-Yoon Kim1, Ki-Ro Yoon2, Kihyun Shin3, Ji-Won Jung4, Graeme Henkelman5, Won-Hee Ryu6
|
| 소속 |
1Department of Chemical and Biological Engineering, 2Sookmyung Women's Univ., 3Advanced Textile R&D Department, 4Korea Institute of Industrial Technology (KITECH), 5Department of Chemistry and the Oden Institute of Computational Engineering and Sciences, 6Univ. of Texas at Austin |
| 키워드 |
<P>electrospinning; WO<SUB>3</SUB>; oxygen deficiency; nanofibers; ORR; catalyst supports</P>
|
| E-Mail |
|
