Nanoporous gyroid platinum with high catalytic activity from block copolymer templates via electroless plating

Nanoporous platinum (Pt) with a gyroid nanostructure was fabricated using a nanoporous polymer with gyroid nanochannels as a template. The nanoporous polymer template was obtained from the self-assembly of the degradable block copolymer, polystyrene-b-poly(L-lactide) (PS-PLLA), followed by the hydrolysis of the PLLA blocks. Templated electroless plating can be conducted under ambient conditions to create a precisely controlled Pt gyroid nanostructure with high crystallinity in a PS matrix. After removal of the PS matrix, the well-interconnected nanoporous gyroid Pt can be successfully fabricated. Compared with commercially available catalysts, the nanoporous Pt possesses superior macroscopic stability and peak specific activity, benefiting from the well-defined network structure with robust texture and the growth of the low-index crystalline facets of Pt.