Here, we combine the Pickering wax-emulsion technique with galvanic electrochemistry to obtain Pt metal films from copper nanoparticle seeds asymmetrically grown on SiO 2 micropar-Figure : Schematic of the synthetic approach used to grow uniform and asymmetric Pt films: a. Bulk modification of the SiO 2 microparticles with uniform Pt films b. Asymmetric growth of Pt films on SiO 2 microparticles via SiO 2 -wax colloidosomes obtained with the Pickering emulsion technique ticle supports (Figure ). In particular, we exploit the rapid complexation of Cu(II) by amines present on the surface of the SiO 2 microparticle supports. Copper nanoparticles are thus grown directly on the SiO 2 upon addition of a strong reducing agent, providing greater control over nanoparticle growth and minimising the formation of excess nanoparticles. Using copper as a sacrificial template not only reduces nanoparticle waste and the use of expensive and toxic metal precursors, but copper can also be galvanically replaced with a range of metals, promising an economical and versatile approach to fabricate microrobots with different functionalities .