New NiCo-Pt nanopolyhedron inlay-structures with an average diameter of similar to 450 nm have been synthesized through replacement deposition Co or Ni by reductive replacement with a Pt submonolayer (galvanic replacement) on NiCo hexagonal nanoplates and nanoicosahedrons. The resultant products are investigated as hydrolytic dehydrogenation catalyst for potential hydrogen energy applications. The NiCo-Pt nanopolyhedrons exhibit higher catalytic activity than NiCo nanopolyhedrons for the hydrolysis of borane in aqueous ammonia borane at ambient atmosphere and room temperature. In particular, the NiCo Pt hexagonal nanoplates exhibit efficient catalytic activity with a lower activation energy of 45.72 kJ mol(-1) than that (49.4 kJ mol(-1)) for NiCo. (C) 2012 Elsevier B.V. All rights reserved.