Nitrogen-doped mesoporous carbons were prepared using a biopolymer, gelatin as precursor by nano-CaCO3 template method. Although the surface area of the carbon obtained at 800 degrees C is only 666 m(2) g(-1), the existence of abundant nitrogen-containing functional groups with a nitrogen content of 10.72 wt% makes the carbon has a relative high capacitance of 198 F g(-1) in 6 mol L-1 KOH aqueous electrolytes. The developed mesoporous structure endows the carbon with good rate capability, and the capacitance can remain 135 F g(-1) even when the current density increases to 20 A g(-1.) The carbon also possesses excellent cycle durability, indicating an attractive electrode material for supercapacitors. (C) 2013 Elsevier B.V. All rights reserved.