Preparation of Porous Carbon Materials with Metal Lignin Complexes as Precursors for High-Performance Supercapacitor

다국어 초록 (Multilingual Abstract)

Porous carbon can significantly improve the energy storage performance of supercapacitors through fast ion transport and charge transfer kinetics. Therein, the fabrication of hierarchical porous carbon nanosheets by means of a sustainable and cost-efficient synthetic strategy has attracted considerable interest. Herein, 2D lignin-based carbon nanosheets (N-LHPC) with hierarchical pore structures were facilely synthesized by a one-pot process of nitrogen and oxygen co-doping method. The nitrogen doping and in-situ MgO template embedded in the carbon matrix were successfully achieved by combining the sustainable resource lignin with melamine and metal chlorides. The optimized N-LHPC exhibits a unique 2D lamellar morphology with layered pores, and due to the advantages of its abundant pore structure, N-LHPC exhibits a high specific capacitance of 235.75 F/g at 0.5 A/g and excellent rate capability performance in alkaline electrolytes. In addition, the symmetrical supercapacitor based on N-LHPC achieves a maximum energy density of 14.75 Wh/kg at the power density of 450 W/kg, demonstrating good application prospects. The synthetic N/O co-doping strategy proposed in this work provides lignin-based carbon materials with hierarchical nanostructure, abundant pseudocapacitive active species, and good electron/ion transfer properties, which are responsible for the excellent capacitive properties of the optimized materials.