Abstract
This work develops an extended Stober method to obtain SiO2@polydopamine with a one-pot process. Such composites can be further processed to obtain hollow N-doped carbon capsules (HNCSs). More importantly, the HNCSs can be used as templates to synthesise HNCSs@Fe3O4 and HNCSs@MnO2 composites, which greatly widened the application of HNCSs.