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Wavy PtCu alloy nanowire networks with abundant surface defects enhanced oxygen reduction reaction

  • Dahui Fang
  • Lei Wan
  • Qike Jiang
  • Hongjie Zhang
  • Xuejun Tang
  • Xiaoping Qin
  • Zhigang ShaoEmail author
  • Zidong WeiEmail author
Research Article
  • 110 Downloads

Abstract

Bimetallic platinum-copper (Pt-Cu) alloy nanowires have emerged as a novel class of fuel cell electrocatalysts for oxygen reduction reaction (ORR) due to their intrinsic high catalytic activity and durability, but preparing such electrocatalysts with clean surface via facile method is still a challenge. Herein, PtCu alloy with nanowire networks (NWNs) structure is obtained by a simple modified polyol method accompanied with a salt-mediated self-assembly process in a water/ethylene glycol (EG) mixing media. The formation mechanism of PtCu NWNs including the morphological evolution and the relevant experimental parameters has been investigated systematically. We propose that a micro-interface in H2O-EG media formed with the assistance of disodium dihydrogen pyrophosphate (Na2H2P2O7) and its unique nature of coordinating with Pt2+ or Cu2+ play critical roles in the formation of NWNs. When tested as ORR catalyst, the PtCuNWNs/C exhibits much higher activity and durability than that of PtNWNs/C and commercial Pt/C, even exceeding the target of DOE in 2020. The excellent performance of PtCuNWNs/C could be attributed to the unique structure of NWNs with 2.4 nm ultrathin wavy nanowires and plentiful surface defects and the modified electronic effect caused by alloying with Cu atoms.

Keywords

PtCu nanoalloy nanowire networks surface defect self-assembly oxygen reduction reaction 

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Notes

Acknowledgements

This work was supported by the National Major Research Project (No. 2018YFB0105601), the National Natural Science Foundation of China (No. 21576257), the Natural Science Foundation-Liaoning United Fund (No. U1508202), and the Strategic Priority Research Program of the Chinese Academy of Sciences (No. XDB06050303).

Supplementary material

12274_2019_2511_MOESM1_ESM.pdf (3.6 mb)
Wavy PtCu alloy nanowire networks with abundant surface defects enhanced oxygen reduction reaction

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Copyright information

© Tsinghua University Press and Springer-Verlag GmbH Germany, part of Springer Nature 2019

Authors and Affiliations

  • Dahui Fang
    • 1
    • 2
  • Lei Wan
    • 3
  • Qike Jiang
    • 4
  • Hongjie Zhang
    • 1
  • Xuejun Tang
    • 1
    • 2
  • Xiaoping Qin
    • 1
  • Zhigang Shao
    • 1
    Email author
  • Zidong Wei
    • 5
    Email author
  1. 1.Fuel Cell System and Engineering Laboratory, Dalian Institute of Chemical PhysicsChinese Academy of SciencesDalianChina
  2. 2.University of Chinese Academy of SciencesBeijingChina
  3. 3.The State Key Laboratory of Chemical Engineering, Department of Chemical EngineeringTsinghua UniversityBeijingChina
  4. 4.Advanced Electron Microscopy Research Group, Dalian Institute of Chemical PhysicsChinese Academy of SciencesDalianChina
  5. 5.College of Chemistry and Chemical EngineeringChongqing UniversityChongqingChina

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