  Nanoporous gold (NPG) with bi-continuous ligaments and pores structure has
promising potential in functional applications, among which one prominent
example is fuel cell electrocatalyst. However, current application of NPG is
mostly limited to methanol electro-oxidation due to its weak catalytic
performance. Here we report a simple chemical dealloying process, for
generating peculiar three-dimensional (3D) free-standing NPG with high specific
surface area associated with a novel porous cone shaped protrusion morphology.
This NPG structure possesses the highest specific activity of catalytic
performance reported NPG catalysts so far.
