Synergistic Activation for Synthesis of Sulfur and Oxygen Co-Doped Porous Carbons and Their Application for Dye Adsorption and Supercapacitor

摘要

Environmentally friendly activation strategies for synthesis of heteroatom-doped porous carbons are extremely welcome. Here, K2SO4 and NaCl-KCl were introduced simultaneously to prepare sulfur/oxygen co-doped porous carbons (SPC). By adopting phenolic resin (PF) as the carbon source, the optimal SPC sample with a large surface area of 1838 m(2) g(-1) and pore volume of 1.18 cm(3) g(-1) was successfully prepared. Structure characterizations demonstrated that K2SO4 mainly accounted for the pore formation while NaCl-KCl had a confinement effect on the carbon loss. Finally, as a multifunctional adsorbent, the maximum capacity for SPC-1-2-5 towards Rhodamine B (RhB) reached 2532.3 mg g(-1), showing a great potential in cleaning water. As an active electrode material for supercapacitor, the specific capacitance for SPC-1-2-5 reached 296.7 F g(-1) at the current density of 0.5 A g(-1). And the specific capacitance retained 92.8 % after 10000 cycles at 5 A g(-1), also demonstrating its excellent cycle stability in electrochemistry. This methodology of simultaneous activation and confinement could be extended to obtain new carbon materials for various applications.