Revealing the elemental-specific growth dynamics of Pt–Cu multipods by scanning transmission electron microscopy and chemical mapping

Research output: Contribution to journalArticlepeer-review

Authors

  • Yingying Jiang
  • Ting Bian
  • Fang Lin
  • Hui Zhang
  • Chuanhong Jin
  • Deren Yang
  • Ze Zhang

Colleges, School and Institutes

External organisations

  • Zhejiang University
  • College of Electronic Engineering, South China Agricultural University, Guangzhou

Abstract

In this work, we reported our experimental approach to reveal the detailed growth behavior of platinum (Pt)–copper (Cu) bimetallic multipod nanostructures in a one-pot synthesis by analyzing the intermediate products from different stages by using aberration-corrected scanning transmission electron microscopy and associated energy-dispersive X-ray spectroscopy. An element-specific growth trajectory of Pt–Cu multipod nanostructures with compositional variation couples to geometric morphologies was observed: Ptx–Cu1−x multipods start from Pt-rich seeds (x > 0.6), evolve into a Pt–Cu alloy phase (x ≈ 0.5), and then form Pt-rich branches (with x > 0.8). This could be further explained on considering the different redox potentials of two metals and their interactions through underpotential deposition, galvanic replacement, and phase segregation. The observed combination of geometric morphologies and compositional variations may provide new strategies to potentially aid rational synthesis of alloy catalysts.

Details

Original languageEnglish
Pages (from-to)21284-21289
JournalJournal of Materials Chemistry A
Volume3
Issue number42
Early online date7 Sep 2015
Publication statusPublished - 14 Nov 2015