北海道大学 · Materials Science
미우라 아키라 교수의 연구실은 나노구조 전이금속 화합물, 특히 백금- zinc (PtZn) 나노입자와 망간 산화질화물 등 고도로 설계된 나노소재를 활용해 연료전지 및 에너지 변환 반응에서 높은 촉매 활성을 확보하는 데 주력하고 있습니다. 특히 고온 기체상 반응과 고체상 합성을 통해 안정적이고 균일한 나노입자를 합성하며, 이들의 전자구조와 산화환원 반응 메커니즘을 정밀하게 분석합니다. 연구는 나노소재의 합성-구조-촉매성능 간의 상관관계를 규명하는 데 초점이 맞춰져 있습니다.
표시된 성과는 수집된 데이터 기준으로 산출되며, 일부 차이가 있을 수 있습니다.
Intermetallic PtZn nanoparticles with stable and high activities toward formic acid and methanol electrooxidation were synthesized by reaction of carbon-supported Pt nanoparticles with Zn vapor at 500 °C for 8 h under flowing nitrogen at atmospheric pressure. The resulting well-dispersed 3−15 nm diameter PtZn nanoparticles were tetragonal phase (P4/mmm: a=0.2842(1) nm, c=0.3488(3) nm) and their Pt:Zn ratio was approximately 1:1. Reactions using unsupported Pt nanoparticles (<5 nm domain size) pr
Solid-state synthesis from powder precursors is the primary processing route to advanced multicomponent ceramic materials. Designing reaction conditions and precursors for ceramic synthesis can be a laborious, trial-and-error process, as heterogeneous mixtures of precursors often evolve through a complicated series of reaction intermediates. Here, ab initio thermodynamics is used to model which pair of precursors has the most reactive interface, enabling the understanding and anticipation of whi
The catalytic activity of manganese oxynitrides in the oxygen reduction reaction (ORR) was investigated in alkaline solutions to clarify the effect of the incorporated nitrogen atoms on the ORR activity. These oxynitrides, with rock-salt-like structures with different nitrogen contents, were synthesized by reacting MnO, Mn2 O3 , or MnO2 with molten NaNH2 at 240-280 °C. The anion contents and the Mn valence states were determined by combustion analysis, powder X-ray diffraction, and X-ray absorpt
