2014 Fiscal Year Final Research Report
Designed Synthesis of Pt Concentration Controlled Nickel-based Alloy Catalysts
| Project/Area Number |
25600028
|
|---|
| Research Category |
Grant-in-Aid for Challenging Exploratory Research
|
| Allocation Type | Multi-year Fund |
|---|
| Research Field |
Nanomaterials chemistry
|
|---|
| Research Institution | The University of Shiga Prefecture |
|---|
Principal Investigator |
|
|---|
| Project Period (FY) |
2013-04-01 – 2015-03-31
|
| Keywords | Ni-Pt nanoparticles / catalysts / alcohol reduction / cyclic voltammetry / Ni-Pd-Pd nanoparticles / Alloy nanoparticles / Core-shell nanoparticles / Atomic diffusion |
|---|
| Outline of Final Research Achievements |
Designed synthesis of highly catalytic Ni-Pt and Ni-Pt-Pd nanoparticles was attempted. Though these unique particles were cubic-shaped and their edges and corners were decorated with Pt, the yield was very poor and modification of the synthesis process was needed. As a consequence, the knowledge on the formation mechanism was elucidated experimentally. The results suggested that in the case of Ni-Pt particles, Pt is deposited first and subsequently Ni precipitate on the surface of Pt particles. However, as the reaction progressed, Pt atoms diffused outward and reached the corners and edges of the particle, whose shape changed from nearly spherical at the initial stages of the reaction to a perfect cube at the end of the reaction, forming a Ni rich cube (core)-Pt(cage). The hollow cage obtained by dissolving Ni was composed mainly of Pt and the Ni content was 12%. Mass activity of the Ni-Pt cage was about three times that of the commercial catalyst.
|
| Free Research Field |
材料科学
|
