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Ni@Ru and NiCo@Ru Core–Shell Hexagonal Nanosandwiches with a Compositionally Tunable Core and a Regioselectively Grown Shell
Author(s) -
Hwang Hyeyoun,
Kwon Taehyun,
Kim Ho Young,
Park Jongsik,
Oh Aram,
Kim Byeongyoon,
Baik Hionsuck,
Joo Sang Hoon,
Lee Kwangyeol
Publication year - 2018
Publication title -
small
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 3.785
H-Index - 236
eISSN - 1613-6829
pISSN - 1613-6810
DOI - 10.1002/smll.201702353
Subject(s) - catalysis , materials science , nanoparticle , regioselectivity , nanotechnology , shell (structure) , hexagonal crystal system , oxygen evolution , chemical engineering , ruthenium , core (optical fiber) , chemistry , crystallography , composite material , electrode , organic chemistry , electrochemistry , engineering
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 (Ni 3 Co x @Ru HNS). Core–shell HNS structures show superior electrocatalytic activity for the oxygen evolution reaction (OER) to a commercial RuO 2 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 (Ru 4+ ) species, which can be modulated by the core compositions.