Porous Nitrogen-Doped Carbon Microspheres Derived from Microporous Polymeric Organic Frameworks for High Performance Electric Double-Layer Capacitors.

This research presents a simple and efficient method to synthesize porous nitrogen-doped carbon microspheres (PNCM) by the carbonization of microporous poly(terephthalaldehyde-pyrrole) organic frameworks (PtpOF). The common KOH activation process is used to tune the porous texture of the PNCM and produce an activated-PNCM (A-PNCM). The PNCM and A-PNCM with specific surface area of 921 and 1303 m² g⁻¹, respectively, are demonstrated as promising candidates for EDLCs. At a current density of 0.5 A g⁻¹, the specific capacitances of the PNCM and A-PNCM are 248 and 282 F g⁻¹, respectively. At the relatively high current density of 20 A g⁻¹, the capacitance remaining is 95 and 154 F g⁻¹, respectively. Capacity retention of the A-PNCM is more than 92 % after 10 000 charge/discharge cycles at a current density of 2 A g⁻¹. [ABSTRACT FROM AUTHOR]