In situ development of highly concave and composition-confined PtNi octahedra with high oxygen reduction reaction activity and durability

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• 作者：Enbo Zhu ; Yongjia Li ; Chin-Yi Chiu ; Xiaoqing Huang ; Mufan Li ; Zipeng Zhao…
• 关键词：PtNi alloy ; concave ; oxygen reduction reaction
• 刊名：Nano Research
• 出版年：2016
• 出版时间：January 2016
• 年：2016
• 卷：9
• 期：1
• 页码：149-157
• 全文大小：2,021 KB
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• 作者单位：Enbo Zhu (1)
  Yongjia Li (1)
  Chin-Yi Chiu (1)
  Xiaoqing Huang (1)
  Mufan Li (2)
  Zipeng Zhao (1)
  Yuan Liu (1)
  Xiangfeng Duan (2) (3)
  Yu Huang (1) (3)
  
  1. Department of Materials Science and Engineering, University of California, Los Angeles, CA, 90095, USA
  2. Department of Chemistry and Biochemistry, University of California, Los Angeles, CA, 90095, USA
  3. California NanoSystems Institute, University of California, Los Angeles, CA, 90095, USA
  
• 刊物类别：Chemistry and Materials Science
• 刊物主题：Chinese Library of Science
  Chemistry
  Nanotechnology
  
• 出版者：Tsinghua University Press, co-published with Springer-Verlag GmbH
• ISSN：1998-0000

文摘

Controlled syntheses of PtNi metal nanocrystals with unique structures for catalyzing oxygen reduction reactions (ORRs) have attracted great interest. Here, we report the one-step synthesis of single-crystal PtNi octahedra with in situ-developed highly concave features and self-confined composition that are optimal for ORR. Detailed studies revealed that the Pt-rich seeding, subsequent Pt/Ni co-reduction, and Pt–Ni interfusion resulted in uniform single-crystal PtNi octahedra, and that the combination of Ni facet segregation and oxygen etching of a Ni-rich surface led to the concavity and confined Ni content. The concave PtNi nanocrystals exhibited much higher ORR performance than the commercially available Pt/C catalyst in terms of both specific activity (29.1 times higher) and mass activity (12.9 times higher) at 0.9 V (vs. reversible hydrogen electrode (RHE)). The performance was also higher than that of PtNi octahedra without concavity, confirming that the higher activity was closely related to its morphology. Moreover, the concave octahedra also exhibited remarkable stability in ORR (93% mass activity remained after 10,000 cycles between 0.6 and 1.1 V vs. RHE) owing to the passivation of the unstable sites.