Construction of NiCo-Pt nanopolyhedron inlay-structures and their highly efficient catalysis hydrolytic dehydrogenation toward ammonia borane

► New designed NiCo-Pt nanopolyhedron inlay-structures have been firstly reported in this work. ► NiCo-Pt hexagonal-nanoplates exhibit exceedingly high dehydrogenation catalytic activity. ► NiCo-Pt magnetic nanopolyhedrons can be separated and recovered for recyclable use. ► As-obtained NiCo-Pt nanopolyhedrons have the potential application in energy source.