1 Jiangsu Key Laboratory for Environment Functional Materials, Suzhou University of Science and Technology, Suzhou 215009, Jiangsu, China 2 School of Materials Science and Engineering, Suzhou University of Science and Technology, Suzhou 215009, Jiangsu, China 3 Jiangsu Collaborative Innovation Center of Technology and Material for Water Treatment, Suzhou University of Science and Technology, Suzhou 215009, Jiangsu, China 4 Jiangsu Province Ceramics Research Institute Co., Ltd., Yixing 214221, Jiangsu, China 5 Suzhou Institute of Environmental Science, Suzhou 215007, Jiangsu, China
Abstract: Graphite phase carbon nitride (g-C3N4) has a two-dimensional structure, good stability and simple synthesis method. It can be used as an alternative material for graphene electrode in supercapacitors, but its capacitor performance is poor. Biochar has the advantages of energy storage due to its natural porous structure and abundant surface functional groups. Urea was used as the precursor of g-C3N4 and pleulocargyrus eryngii was selected as the biological template, then lamellar g-C3N4/C was synthesized to obtain porous two-phase composite material with high specific surface area. The results showed that CeO2 nanoparticles were anchored on the surface and pores of biochar by hydrothermal method to obtain CeO2-g-C3N4/C three-phase composite material. The maximum specific capacitance of CeO2-g-C3N4/C was 169.6 F·g-1, and the capacitance retention rate was 97% after 2 000 cycles. The combination of g-C3N4 and biochar improves the energy storage performance of the matrix material. The load of CeO2 improves the electrochemical activity. The energy storage performance, charge and discharge performance and recycle stability of the whole material is excellent because of the three-phase composite.
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