Auto-programmed synthesis of metallic aerogels: Core-shell Cu@Fe@Ni aerogels for efficient oxygen evolution reaction

Bo Jiang, Zhe Wan, Yunqing Kang, Yanna Guo, Joel Henzie, Jongbeom Na, Hexing Li, Shengyao Wang, Yoshio Bando, Yoshio Sakka, Yusuke Yamauchi

Research output: Contribution to journalArticlepeer-review

1 Citation (Scopus)

Abstract

Porous metallic aerogels are a new class of cutting-edge materials useful in catalysis because they combine high conductivity with low density and high surface area. However, the exploration of transition metal-based aerogels with core-shell architectures remains a fundamental challenge. Here, we report a one-step auto-programmed synthesis method to generate a core-shell Cu@Fe@Ni metallic aerogel. Electroactivating (EA) the core-shell Cu@Fe@Ni causes the Fe inner shell to migrate into the Ni outer shell and forms a highly-active catalytic hydroxide on the surface of the aerogel. The resulting EA-Cu@Fe@Ni catalysts exhibited a low OER overpotential of 240 mV at 10 mA cm-2, which is much smaller than bimetallic CuNi (320 mV), CuFe (390 mV), and RuO2 (271 mV). In-situ Raman measurements confirm that the catalyst's outer layer is composed of NiOOH doped with Fe during the electrochemical activation process, resulting in the high OER performance. This work describes the first example of a trimetallic core-shell aerogel synthesized in one step and enables another strategy for designing highly active metals/metal oxide electrocatalysts via surface reconstruction.

Original languageEnglish
Article number105644
JournalNano Energy
Volume81
DOIs
Publication statusPublished - 2021 Mar
Externally publishedYes

Keywords

  • Core-shell aerogels
  • In-situ oxidation
  • Oxygen evolution reaction
  • Porous structure
  • Transition metal-based electrocatalyst

ASJC Scopus subject areas

  • Renewable Energy, Sustainability and the Environment
  • Materials Science(all)
  • Electrical and Electronic Engineering

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