Preparation of fcc-2H-fcc Heterophase Pd@Ir Nanostructures for High-Performance Electrochemical Hydrogen Evolution

Research output: Journal Publications and Reviews (RGC: 21, 22, 62)21_Publication in refereed journalpeer-review

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Author(s)

  • Yiyao Ge
  • Bo Chen
  • Zhiqi Huang
  • Zhenyu Shi
  • Jiawei Liu
  • Gang Wang
  • Ye Chen
  • Qinbai Yun
  • Hua Zhang

Detail(s)

Original languageEnglish
Article number2107399
Journal / PublicationAdvanced Materials
Volume34
Issue number4
Online published31 Oct 2021
Publication statusPublished - 27 Jan 2022

Abstract

With the development of phase engineering of nanomaterials (PEN), construction of noble-metal heterostructures with unconventional crystal phases, including heterophases, has been proposed as an attractive approach toward the rational design of highly efficient catalysts. However, it still remains challenging to realize the controlled preparation of such unconventional-phase noble-metal heterostructures and explore their crystal-phase-dependent applications. Here, various Pd@Ir core–shell nanostructures are synthesized with unconventional fcc-2H-fcc heterophase (2H: hexagonal close-packed; fcc: face-centered cubic) through a wet-chemical seeded method. As a result, heterophase Pd66@Ir34 nanoparticles, Pd45@Ir55 multibranched nanodendrites, and Pd68@Ir22Co10 trimetallic nanoparticles are obtained via the phase-selective epitaxial growth of fcc-2H-fcc-heterophase Ir-based nanostructures on 2H-Pd seeds. Importantly, the heterophase Pd45@Ir55 nanodendrites exhibit excellent catalytic performance toward electrochemical hydrogen evolution reaction (HER) under acidic conditions. An overpotential of only 11.0 mV is required to achieve a current density of 10 mA cm−2 on Pd45@Ir55 nanodendrites, which is lower than those of the conventional fcc-Pd47@Ir53 counterparts, commercial Ir/C and Pt/C. This work not only demonstrates an appealing route to synthesize novel heterophase nanomaterials for promising applications in the emerging field of PEN, but also highlights the significant role of the crystal phase in determining their catalytic properties.

Research Area(s)

  • heterophases, hydrogen evolution reaction, noble-metal heterostructures, phase engineering of nanomaterials, phase-dependent applications

Citation Format(s)

Preparation of fcc-2H-fcc Heterophase Pd@Ir Nanostructures for High-Performance Electrochemical Hydrogen Evolution. / Ge, Yiyao; Wang, Xixi; Chen, Bo; Huang, Zhiqi; Shi, Zhenyu; Huang, Biao; Liu, Jiawei; Wang, Gang; Chen, Ye; Li, Lujiang; Lu, Shiyao; Luo, Qinxin; Yun, Qinbai; Zhang, Hua.

In: Advanced Materials, Vol. 34, No. 4, 2107399, 27.01.2022.

Research output: Journal Publications and Reviews (RGC: 21, 22, 62)21_Publication in refereed journalpeer-review