Ni at Ru and NiCo at Ru Core-Shell Hexagonal Nanosandwiches with a Compositionally Tunable Core and a Regioselectively Grown Shell

Hyeyoun Hwang, Taehyun Kwon, Ho Young Kim, Jongsik Park, Aram Oh, Byeongyoon Kim, Hionsuck Baik, Sang Hoon Joo, Kwangyeol Lee

Research output: Contribution to journalArticle

26 Citations (Scopus)

Abstract

The development of highly active electrocatalysts is crucial for the advancement of renewable energy conversion devices. The design of core-shell nanoparticle catalysts represents a promising approach to boost catalytic activity as well as save the use of expensive precious metals. Here, a simple, one-step synthetic route is reported to prepare hexagonal nanosandwich-shaped Ni at Ru core-shell nanoparticles (Ni at Ru HNS), in which Ru shell layers are overgrown in a regioselective manner on the top and bottom, and around the center section of a hexagonal Ni nanoplate core. Notably, the synthesis can be extended to NiCo at Ru core-shell nanoparticles with tunable core compositions (Ni3Cox at Ru HNS). Core-shell HNS structures show superior electrocatalytic activity for the oxygen evolution reaction (OER) to a commercial RuO2 black catalyst, with their OER activity being dependent on their core compositions. The observed trend in OER activity is correlated to the population of Ru oxide (Ru4+) species, which can be modulated by the core compositions.

Original languageEnglish
JournalSmall
DOIs
Publication statusAccepted/In press - 2017 Jan 1

Keywords

  • Anisotropic core-shell nanoparticles
  • Hetero-nanostructure interfaces
  • Lattice mismatch
  • One-pot synthesis
  • Oxygen evolution reaction

ASJC Scopus subject areas

  • Biotechnology
  • Biomaterials
  • Engineering (miscellaneous)

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