High-Performance Lithium-Ion Battery and Supercapacitors Using Covalent Organic Frameworks (COFs)/Graphitic Carbon Nitride (g-C<sub>3</sub>N<sub>4</sub>)-Derived Hierarchical N-Doped Carbon
Mervat Ibrahim, Moataz G. Fayed, Saad G. Mohamed, Zhen Wen, Xuhui Sun, Hani Nasser Abdelhamid
Abstract
Energy storage materials have advanced renewable energy technologies. Herein, we described the one-pot synthesis of covalent organic frameworks (COFs)/graphitic carbon nitride (g-C3N4) nanocomposite. The condensation of melamine and benzene-1,3,5-tricarboxyaldehyde with and without g-C3N4 offered the synthesis of COF and COF/g-C3N4. Furthermore, N-doped carbon and N-doped carbon/g-C3N4 were synthesized via the carbonization of COF and COF/g-C3N4, respectively. The materials i.e., before and after carbonization were used as electrode materials for supercapacitors and lithium-ion batteries (LIBs). They showed specific capacitance of 211, 257.5, 450, and 835.2 F·g–1 for COF, COF/g-C3N4, N-doped carbon, and N-doped carbon/g-C3N4, respectively. Asymmetric supercapacitor device using N-doped carbon/g-C3N4 exhibited good energy (45.97 Wh·kg–1) with high power (659.3 W·kg–1). The N-doped C/g-C3N4 electrode was also applied for LIBs, offering a discharge capacity of 390 mAh·g–1 (at 50 mA·g–1).