Octahedral PtNi nanoparticles with controlled surface structure and composition for oxygen reduction reaction
- Authors
- Lu, Yizhong; Thia, Larissa; Fisher, Adrian; Jung, Chi-Young; Yi, Sung Chul; Wang, Xin
- Issue Date
- Nov-2017
- Publisher
- SCIENCE PRESS
- Keywords
- PtNi; octahedral; concave; surface structure; oxygen reduction reaction
- Citation
- SCIENCE CHINA-MATERIALS, v.60, no.11, pp.1109 - 1120
- Indexed
- SCIE
SCOPUS
- Journal Title
- SCIENCE CHINA-MATERIALS
- Volume
- 60
- Number
- 11
- Start Page
- 1109
- End Page
- 1120
- URI
- https://scholarworks.bwise.kr/hanyang/handle/2021.sw.hanyang/151235
- DOI
- 10.1007/s40843-017-9029-5
- ISSN
- 2095-8226
- 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.
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