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.
- Anisotropic core-shell nanoparticles
- Hetero-nanostructure interfaces
- Lattice mismatch
- One-pot synthesis
- Oxygen evolution reaction
ASJC Scopus subject areas
- Engineering (miscellaneous)