wt% by controlling the amount of glucosamine (GA). The N-CNT materials were prepared by hydrothermal treatment of CNTs with glucosamine hydrochloride (1.2, and 1.8 g) at 180 ˚C for 24 h, and further calcined at 900 ˚C under N2 flow for 4 h to obtain N-CNT1 (1.2 g of GA derived), and N-CNT2 (1.8 g of GA derived). The presence of nitrogen contents with 1.8, and 2.5% for N-CNT1, and N-CNT2, respectively were determined from XPS analysis. The SBET