Ni@Ru and NiCo@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 journalArticlepeer-review

46 Citations (Scopus)


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@Ru core–shell nanoparticles (Ni@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@Ru core–shell nanoparticles with tunable core compositions (Ni3Cox@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
Article number1702353
Issue number3
Publication statusPublished - 2018 Jan 18

Bibliographical note

Funding Information:
H.H., T.K., and H.Y.K. contributed equally to this work. This research was supported by the National Research Foundation (NRF) of Korea (NRF-2017R1A2B3005682), BioNano Health-Guard Research Center funded by the Ministry of Science and ICT (MSIT) of Korea as Global Frontier Project, Grant No. H-GUARD_2013M3A6B2078946, IBS-R023-D1, and the Korea University Future Research Grant. S.H.J. and H.Y.K. were supported by the NRF of Korea (NRF-2017R1A2B2008464). The authors also thank Korea Basic Science Institute (KBSI) for allowing the usage of their HRTEM instruments.

Publisher Copyright:
© 2017 WILEY-VCH Verlag GmbH & Co. KGaA, Weinhei/1.


  • anisotropic core–shell nanoparticles
  • hetero-nanostructure interfaces
  • lattice mismatch
  • one-pot synthesis
  • oxygen evolution reaction

ASJC Scopus subject areas

  • General Chemistry
  • General Materials Science
  • Biotechnology
  • Biomaterials


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