Preparation and electrochemical properties of boron-doped mesoporous carbons

Boron-doped mesoporous carbons were prepared by an evaporation-induced self-assembly method using boric acid-modified phenol-formaldehyde resin as carbon precursor. The samples were characterized by nitrogen adsorption, small angle X-ray scattering and transmission electron microscopy. Their electrochemical properties were tested by a three-electrode system. The influence of the boron content on the pore structure and electrochemical properties is discussed. Results show that the pore diameter of the mesoporous carbons decreased and the degree of pore order decreased with the increasing boron content. When the boron mass fraction was 0.3%, the specific capacitance per unit area of the sample reached 0.51F · m-2 at a current density of 75mA · g-1, which was 1.9 times that of the undoped one and its ordered pore structure was retained.