Octahedral PtNi nanoparticles with controlled surface structure and composition for oxygen reduction reaction
- Title
- Octahedral PtNi nanoparticles with controlled surface structure and composition for oxygen reduction reaction
- Author
- 이성철
- Keywords
- PtNi; octahedral; concave; surface structure; oxygen reduction reaction
- Issue Date
- 2017-11
- Publisher
- SCIENCE PRESS
- Citation
- SCIENCE CHINA-MATERIALS, v. 60, no. 11, page. 1109-1120, Special no. SI
- Abstract
- Controlling the surface structure and composition at the atomic level is an effective way to tune the catalytic properties of bimetallic catalysts. Herein, we demonstrate a generalized strategy to synthesize highly monodisperse, surfactant-free octahedral PtxNi1-x nanoparticles with tunable surface structure and composition. With increasing the Ni content in the bulk composition, the degree of concaveness of the octahedral PtxNi1-x nanoparticles increases. We systematically studied the correlation between their surface structure/composition and their observed oxygen reduction activity. Electrochemical studies have shown that all the octahedral PtxNi1-x nanoparticles exhibit enhanced oxygen reduction activity relative to the state-of-the-art commercial Pt/C catalyst. More importantly, we find that the surface structure and composition of the octahedral PtxNi1-x nanoparticles have significant effect on their oxygen reduction activity. Among the studied PtxNi1-x nanoparticles, the octahedral Pt1Ni1 nanoparticles with slight concaveness in its (111) facet show the highest activity. At 0.90 V vs. RHE, the Pt mass and specific activity of the octahedral Pt1Ni1 nanoparticles are 7.0 and 7.5-fold higher than that of commercial Pt/C catalyst, respectively. The present work not only provides a generalized strategy to synthesize highly monodisperse, surfactant-free octahedral PtxNi1-x nanoparticles with tunable surface structure and composition, but also provides insights to the structure-activity correlation.
- URI
- https://link.springer.com/article/10.1007%2Fs40843-017-9029-5https://repository.hanyang.ac.kr/handle/20.500.11754/116277
- ISSN
- 2095-8226; 2199-4501
- DOI
- 10.1007/s40843-017-9029-5
- Appears in Collections:
- COLLEGE OF ENGINEERING[S](공과대학) > CHEMICAL ENGINEERING(화학공학과) > Articles
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