Hou et al. reported a puffed-rice derived honeycomb-like carbon structures composed of thin sheets . The puffed-rice was prepared via thermal effect of steam at the pressure of 5-10 atm, and pre-carbonized in inert atmosphere at 500 ˚C for 1 h. Then, the pre-carbonized puffed rice was mixed with KOH, and further activated at different temperatures (750, 800, 850, and 900 ˚C) under N2 environment. The prepared samples were labelled as NCS-X, where X represents the activation temperature. The XPS studies NCS-X had the oxygen, and nitrogen doping ranging from . The SBET of NCS-X samples was increased with increasing temperature from NCS-750 (1781 m 2 g -1 ) to NCS-850 (3326 m 2 g -1 ), and then decreased for NCS-900 (2330 m 2 g -1 ). The NCS-850 displayed the highest SBET, and mesoporous occupied the 31% proportion of the total pore volume due to thin nanosheets.