Crystal Phase and Architecture Engineering of Lotus-Thalamus-Shaped Pt-Ni Anisotropic Superstructures for Highly Efficient Electrochemical Hydrogen Evolution

Zhicheng Zhang, Guigao Liu, Xiaoya Cui, Bo Chen, Yihan Zhu, Yue Gong, Faisal Saleem, Shibo Xi, Yonghua Du, Armando Borgna, Zhuangchai Lai, Qinghua Zhang, Bing Li, Yun Zong, Yu Han, Lin Gu, Hua Zhang*

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

140 Scopus citations

Abstract

The rational design and synthesis of anisotropic 3D nanostructures with specific composition, morphology, surface structure, and crystal phase is of significant importance for their diverse applications. Here, the synthesis of well-crystalline lotus-thalamus-shaped Pt-Ni anisotropic superstructures (ASs) via a facile one-pot solvothermal method is reported. The Pt-Ni ASs with Pt-rich surface are composed of one Ni-rich “core” with face-centered cubic (fcc) phase, Ni-rich “arms” with hexagonal close-packed phase protruding from the core, and facet-selectively grown Pt-rich “lotus seeds” with fcc phase on the end surfaces of the “arms.” Impressively, these unique Pt-Ni ASs exhibit superior electrocatalytic activity and stability toward the hydrogen evolution reaction under alkaline conditions compared to commercial Pt/C and previously reported electrocatalysts. The obtained overpotential is as low as 27.7 mV at current density of 10 mA cm−2, and the turnover frequency reaches 18.63 H2 s−1 at the overpotential of 50 mV. This work provides a new strategy for the synthesis of highly anisotropic superstructures with a spatial heterogeneity to boost their promising application in catalytic reactions.

Original languageEnglish (US)
Article number1801741
JournalAdvanced Materials
Volume30
Issue number30
DOIs
StatePublished - Jul 26 2018

Keywords

  • Pt-Ni alloys
  • anisotropic structures
  • crystal structures
  • electrocatalysis
  • hydrogen evolution reaction

ASJC Scopus subject areas

  • Materials Science(all)
  • Mechanics of Materials
  • Mechanical Engineering

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