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- Title
Icosahedral Pt–Ni Nanocrystalline Electrocatalyst: Growth Mechanism and Oxygen Reduction Activity.
- Authors
Tian, Renxiu; Shen, Shuiyun; Zhu, Fengjuan; Luo, Liuxuan; Yan, Xiaohui; Wei, Guanghua; Zhang, Junliang
- Abstract
Abstract: Engineering the structure of Pt alloy offers an effective way to the design of high performance electrocatalysts. Herein, we synthesize a sandwich‐structured, icosahedral Pt2.1Ni catalyst through a hot injection method. Its growth involves three steps: 1) burst nucleation of Pt atoms to form a Pt‐enriched core, 2) heterogeneous nucleation of Ni atoms onto the Pt core to form a Ni‐enriched interlayer, and 3) kinetic controlled growth of a Pt‐enriched shell. The Pt‐enriched core protects the nanostructure from collapse and mitigates the strain change caused by lattice mismatch, and thus enhances the stability of the structure. The Ni‐enriched interlayer induces the electronic modification of the outermost Pt shell, and in turn tunes the activity. The Pt‐enriched shell provides more active sites through the exposure of (1 1 1) facets and retards the dissolution of Ni atoms. As a result, this sandwich‐structure enables impressive electrocatalytic activity (0.91 mA cm−2 and 0.32 A m g P t - 1 @ 0.9 V) and duability.
- Subjects
PLATINUM catalysts; NANOCRYSTALS; ICOSAHEDRA; ELECTROCATALYSTS; OXYGEN reduction
- Publication
ChemSusChem, 2018, Vol 11, Issue 6, p1015
- ISSN
1864-5631
- Publication type
Article
- DOI
10.1002/cssc.201800074