From covalent-organic frameworks to hierarchically porous B-doped carbons: A molten-salt approach

B-doped porous carbons have attracted attention in energy applications including gas and energy storage due to the increase of binding energy for H₂ and lowering the Fermi level. However, B-doped carbons are usually microporous materials, which show low surface areas. Herein, for the first time, hierarchically porous B-doped carbons derived from COF-5 have been obtained via a molten-salt (MS) approach. The carbons with micro-meso-macro-porous architectures exhibit enhanced supercapacitive performance and H₂ storage properties. The methodology described may open up a new avenue towards the synthesis of distinct carbon materials in liquid media.