Egg yolk-derived three-dimensional porous carbon for stable electrochemical supercapacitors

Sutliff doped three-dimensional porous carbon materials with specific surface area as high as 2277.79 m(2) g(-1) are prepared by the carbonization of KOH-pretreated egg yolks and employed as electrode materials for supercapacitor application. The material carbonized at 800 degrees C exhibits maximum specific capacitance of 287.66 F g(-1) at a current density of 0.5 A g(-1) still retains a capacitance of 22037 F g(-1) the high current density of 20 A g (-1). This material also shows excellent capacity retention of 97.7% after 2000 cycles at a current density of 2 A g (-1). These results indicate that the surface area, pore volume and heteroatom doping could combine together to affect the electrocapacitive performances of the obtained materials as electrodes. (C )2014 Elsevier BM. All rights reserved.