查看文章

A straightforward one-pot approach for the synthesis of highly porous carbon nanosheets with an excellent performance as supercapacitor electrodes is presented. The procedure is based on the carbonization of an organic salt (i.e., sodium gluconate) at a temperature in the range of 700–900 °C. The carbon nanosheets have a large aspect ratio (length/thickness ≈ 10²–10³), a thickness within the range of 40–200 nm, high BET surface areas (S_BET) of up to 1390 m² g^–1, and a porosity with a hierarchical organization in the micropore–mesopore range. Importantly, via an additional activation step, the textural properties can be substantially enhanced (S_BET up to 1890 m² g^–1). Both the nanosheet morphology (short diffusional paths) and the hierarchical microporous/mesoporous pore structure allow the rapid transport of ions throughout the carbonaceous matrix, leading to excellent electrochemical performance …