Abstract
Block copolymers (BCPs) that consist of chemically different components can self-assemble into various ordered nanostructures due to the incompatibility of constituted blocks. In recent decades, BCPs have been extensively investigated because of their ability to self-assemble into various ordered nanostructures, such as sphere, cylinder, lamellae, and gyroid. Among all of the nanostructures resulting from BCPs self-assembly, gyroid is one of the most appealing morphologies for practical applications because of its unique texture with a matrix and two continuous networks in 3D space. Here, we report the nanoporous platinum (Pt) with gyroid nanostructure fabricated by using a nanoporous polymer with gyroid nanochannels as a template. The nanoporous polymer template was obtained from the self-assembly of degradable block copolymer, polystyrene-b-poly(L-lactide) (PS-PLLA), followed by the hydrolysis of PLLA blocks. Templated electroless plating can be conducted at ambient conditions to create precisely controlled Pt gyroid nanostructure with high crystallinity in a PS matrix. After removal of the PS matrix, well-interconnected nanoporous gyroid Pt can be successfully fabricated. In comparison with commercial 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.