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Nano Research 2019, 12(11): 2766-2773 https://doi.org/10.1007/s12274-019-2511-8
Research Article | Issue | Published: 10 September 2019

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

Show Author's Information Dahui Fang1,2,§,  Lei Wan3,§,  Qike Jiang4,  Hongjie Zhang1,  Xuejun Tang1,2,  Xiaoping Qin1,  Zhigang Shao1( ),  Zidong Wei5( )
Fuel Cell System and Engineering LaboratoryDalian Institute of Chemical PhysicsChinese Academy of SciencesDalian116023China
University of Chinese Academy of SciencesBeijing100049China
The State Key Laboratory of Chemical EngineeringDepartment of Chemical EngineeringTsinghua UniversityBeijing100084China
Advanced Electron Microscopy Research GroupDalian Institute of Chemical PhysicsChinese Academy of SciencesDalian116023China
College of Chemistry and Chemical EngineeringChongqing UniversityChongqing400044China

§ Dahui Fang and Lei Wan contributed equally to this work.

Keywords:
oxygen reduction reaction, self-assembly, surface defect, nanowire networks, PtCu nanoalloy
Topics:
Binary alloysCatalyst activityCopper alloysElectrocatalystsElectrolytic reduction Fuel cellsNanowiresOxygenPhosphorus compoundsSelf assemblySodium compoundsSurface defects
Cite this article:
Fang D, Wan L, Jiang Q, et al. Wavy PtCu alloy nanowire networks with abundant surface defects enhanced oxygen reduction reaction. Nano Research, 2019, 12(11): 2766-2773. https://doi.org/10.1007/s12274-019-2511-8
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Abstract Full text Electronic supplementary material About this article

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.


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Electronic supplementary material
About this article

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

Show Author's information Dahui Fang1,2,§, Lei Wan3,§, Qike Jiang4, Hongjie Zhang1, Xuejun Tang1,2, Xiaoping Qin1, Zhigang Shao1( ), Zidong Wei5( )
Fuel Cell System and Engineering LaboratoryDalian Institute of Chemical PhysicsChinese Academy of SciencesDalian116023China
University of Chinese Academy of SciencesBeijing100049China
The State Key Laboratory of Chemical EngineeringDepartment of Chemical EngineeringTsinghua UniversityBeijing100084China
Advanced Electron Microscopy Research GroupDalian Institute of Chemical PhysicsChinese Academy of SciencesDalian116023China
College of Chemistry and Chemical EngineeringChongqing UniversityChongqing400044China

§ Dahui Fang and Lei Wan contributed equally to this work.

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

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Acknowledgements

Publication history

Received: 13 July 2019
Revised: 09 August 2019
Accepted: 27 August 2019
Published: 10 September 2019
Issue date: November 2019

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

Acknowledgements

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).

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