Crystal phase-controlled growth of PtCu and PtCo alloys on 4H Au nanoribbons for electrocatalytic ethanol oxidation reaction
crystal phase, 4H hexagonal, face-centered cubic, ethanol oxidation reaction, phase engineering of nanomaterials
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 phasedependent applications.
Tsinghua University Press
Jie Wang,Jian Zhang,Guigao Liu,Chongyi Ling,Bo Chen,Jingtao Huang,Xiaozhi Liu,Bing Li,An-Liang Wang,Zhaoning Hu,Ming Zhou,Ye Chen,Hongfei Cheng,Jiawei Liu,Zhanxi Fan,Nailiang Yang,Chaoliang Tan,Lin Gu,Jinlan Wang,Hua Zhang, Crystal phase-controlled growth of PtCu and PtCo alloys on 4H Au nanoribbons for electrocatalytic ethanol oxidation reaction. NanoRes.2020, 13(7): 1970–1975