Skeletal Ni Catalysts Prepared from Amorphous Ni–Zr Alloys: Enhanced Catalytic Performance for Hydrogen Generation from Ammonia Borane |
| |
| Authors: | Ai Nozaki Yasutomo Tanihara Dr Yasutaka Kuwahara Tetsutaro Ohmichi Dr Kohsuke Mori Dr Takeshi Nagase Prof?Dr Hiroyuki Y Yasuda Prof?Dr Hiromi Yamashita |
| |
| Affiliation: | 1. Division of Materials and Manufacturing Science Graduate School of Engineering, Osaka University, Suita, Osaka, Japan;2. Elements Strategy Initiative for Catalysts and Batteries (ESICB), Kyoto University, Katsura, Kyoto, Japan;3. Research Center for Ultra-High Voltage Electron Microscopy, Osaka University, Ibaraki, Osaka, Japan |
| |
| Abstract: | Skeletal Ni catalysts were prepared from Ni–Zr alloys, which possess different chemical composition and atomic arrangements, by a combination of thermal treatment and treatment with aqueous HF. Hydrogen generation from ammonia borane over the skeletal Ni catalysts proceeded efficiently, whereas the amorphous Ni–Zr alloy was inactive. Skeletal Ni prepared from amorphous Ni30Zr70 alloy had a higher catalytic activity than that prepared from amorphous Ni40Zr60 and Ni50Zr50 alloys. The atomic arrangement of the Ni–Zr alloy also strongly affected the surface structure and catalytic activities. Thermal treatment of the amorphous Ni–Zr alloys at a temperature slightly lower than the crystallization temperature led to an increase of the number of surface‐exposed Ni atoms and an enhancement of the catalytic activities for hydrogen generation from ammonia borane. The skeletal Ni catalysts also showed excellent durability and recyclability. |
| |
| Keywords: | alloys ammonia borane amorphous materials heterogeneous catalysts hydrogen generation |
|
|
