Crystal phase-controlled growth of PtCu and PtCo alloys on 4H Au nanoribbons for electrocatalytic ethanol oxidation reaction


Crystal phase can greatly affect the physicochemical properties and applications of nanomaterials. However, it still remains a great challenge to synthesize nanostructures with the same composition and morphology but different phases in order to explore the phase-dependent properties and applications. Herein, we report the crystal phase-controlled synthesis of PtCu alloy shells on 4H Au nanoribbons (NRBs), referred to as 4H-Au NRBs, to form the 4H-Au@PtCu core-shell NRBs. By tuning the thickness of PtCu, 4H-PtCu and face-centered cubic (fcc) phase PtCu (fcc-PtCu) alloy shells are successfully grown on the 4H-Au NRB cores. This thickness-dependent phase-controlled growth strategy can also be used to grow PtCo alloys with 4H or fcc phase on 4H-Au NRBs. Significantly, when used as electrocatalysts for the ethanol oxidation reaction (EOR) in alkaline media, the 4H-Au@4H-PtCu NRBs show much better EOR performance than the 4H-Au@fcc-PtCu NRBs, and both of them possess superior performance compared to the commercial Pt black. Our study provides a strategy on phase-controlled synthesis of nanomaterials used for crystal phase-dependent applications.

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This work was supported by MOE under AcRF Tier 2 (Nos. MOE2016-T2-2-103 and MOE2017-T2-1-162), and NTU under Start-Up Grant (No. M4081296.070.500000) in Singapore. We would like to acknowledge the Facility for Analysis, Characterization, Testing and Simulation, Nanyang Technological University, Singapore, for use of their electron microscopy and X-ray facilities. Z. X. F. and H. Z. thank the financial support from ITC via Hong Kong Branch of National Precious Metals Material Engineering Research Center (NPMM), and acknowledge the start-up grants (Nos. 9380100, 9610480 and 7200651) and grants (Nos. 9610478 and 1886921) in City University of Hong Kong.

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Correspondence to Hua Zhang.

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Crystal phase-controlled growth of PtCu and PtCo alloys on 4H Au nanoribbons for electrocatalytic ethanol oxidation reaction

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Wang, J., Zhang, J., Liu, G. et al. Crystal phase-controlled growth of PtCu and PtCo alloys on 4H Au nanoribbons for electrocatalytic ethanol oxidation reaction. Nano Res. 13, 1970–1975 (2020).

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  • crystal phase
  • 4H hexagonal
  • face-centered cubic
  • ethanol oxidation reaction
  • phase engineering of nanomaterials