Citric acid was first used as a green catalyst which catalyzes both the formation of resorcinol/formaldehyde resin and the assembly of the mesostructure in the presence of triblock copolymers PEO-PPO-PEO (F 127, P 123,or F 127-P 123 mixed surfactants).Ordered structures can be achieved in wide compositions ranges under mild conditions.The obtained carbon materials (C-x) showed ordered 2-D hexagonal symmetry with uniform large pore size (5.2-6.4 nm) and high BET surface area (650-768 m2g-1), as well as thick pore walls (5.6-9.0 nm).