Nitrogen, sulfur, oxygen-codoped porous carbon materials as high performance electrodes for supercapacitors and capacitive deionization

The abundant pores, large surface area, good surface wettability, high conductivity and proper surface functionalization make carbon-based materials have a great future in the application fields of supercapacitors (SCs) and capacitive deionization (CDI). Herein, a new N, S, O co-doped porous carbon material (NSOPC-20) is developed by impregnating SBA-15 template with sucrose and methylene blue, and subsequently ploysising at high temperature and removing templates. The in situ heteroatom doping and template-directed synthesis strategy provides the as-resulted carbon material with lots of ordered mesopores connected by micropores and skeletons with high contents of N, S and O. As an electrode for supercapacitors, NSOPC-20 shows a high capacitance of 465 F g- 1, good cycle stability and rate performance. The assembled supercapacitor also exhibits excellent energy density of 17.25 Wh kg- 1, presenting its superior potential in energy storage. Furthermore, NSOPC-20 exhibits good desalination performance with an electrosorption capacity of 7.4 mg g- 1 in 500 mg L- 1 of NaCl solution.