京都大学：制造混合了8种贵金属的合金：
-功率远超铂催化剂-
京都大学
信州大学
该研究小组在世界上首次成功“制造出一种混合所有贵金属的合金”。
“它是一种传统合金所没有的动力材料。”
北川浩史
京都大学教授
该小组制作了一种溶解了八种贵金属离子的液体，
在 230°C 下以液滴形式逐渐加入有机溶剂中。
合金超细颗粒：
在高温溶剂中，“每个离子立即返回原子，聚集并均匀混合。”
通过这种方法，我们成功地生产了合金超细颗粒。
8种贵金属：
贵金属稀有且耐腐蚀。
金、银、铂、钯、铑、铱、钌、锇八种。
合金用途：
它是一种催化剂，当向水施加电压以产生氢气和氧气时，它会加速反应。
氢有望成为燃烧时不排放二氧化碳的下一代能源。
旨在进行有效反应的研究将继续进行。
这种合金：
反应效率是铂的10倍以上。
北川先生说：“活动显着改善。”
朝日新闻数码
https://www.asahi.com/articles/ASQ2H4TNMQ2GPLBJ005.html
Noble-Metal High-Entropy-Alloy Nanoparticles: Atomic-Level Insight into the Electronic Structure
Abstract
The compositional space of high-entropy-alloy nanoparticles (HEA NPs)
significantly expands the diversity of the materials library.
Every atom in HEA NPs
has a different elemental coordination environment, which requires knowledge of the local electronic structure at an atomic level.However,
such structure has not been disclosed experimentally or theoretically.We synthesized
HEA NPs composed of all eight noble-metal-group elements (NM-HEA) for the first time.Their electronic structure was revealed
by hard X-ray photoelectron spectroscopy and density function theory calculations with NP models.
The NM-HEA NPs
have a lower degeneracy in energy level compared with the monometallic NPs, which is a common feature of HEA NPs.The local density of states (LDOS) of every surface atom was first revealed.
Some atoms of the same constituent element in HEA NPs have different LDOS profiles, whereas atoms of other elements have similar LDOS profiles.
In other words,
one atom in HEA loses its elemental identity and it may be possible to create an ideal LDOS by adjusting the neighboring atoms.The tendency of the electronic structure change was shown by supervised learning.
The NM-HEA NPs showed 10.8-times higher intrinsic activity for hydrogen evolution reaction than commercial Pt/C, which is one of the best catalysts.
Journal of the American Chemical Society