In the work, we developed a facile yet scalable fabrication of N- and O-enriched carbon with hierarchical micro-/mesopores from common agricultural-derived chicken albumen. The albumen-derived hierarchical micro-/mesoporous carbon (AHMC) was endowed with large specific surface area (SSA, 1227 m(2) g(-1)), hierarchical porosity with high microporosity of similar to 50.7%, and high content of heteroatom functionalities (similar to 2.7 at% N and similar to 20 at% O). Thanks to hierarchical micro-/mesoporosity, large effective SSA, and remarkable heteroatom (N, O) doping effects, i.e., the prominent synergy of the structural and compositional advantages, the resultant AHMC delivered a high specific capacitance (SC) of 329 F g(-1) at 0.2 A g(-1), and even 175 F g(-1) at large current rate of 10 A g(-1). The high SC retention of similar to 93.3% over continuous 5000 cycles further highlighted promising advantages of the AHMC for long-term ECs. More remarkably, a striking energy density of similar to 6.1 Wh kg(-1) was obtained for the AHMC-based aqueous symmetric device with 1 M H2SO4 electrolyte. (C) 2015 The Electrochemical Society. All rights reserved.