2, Institute of Material Physics, School of Materials Science and Engineering, Zhejiang University, Hangzhou, Zhejiang Province, China
Pollen is a kind of biomass waste, which is widely available and relatively low-cost. Similar to the other biomass materials, each kind of pollens has its own unique porous micro-structure, which makes it easy to contact and react with other chemical agents, hence, can be easily tuned and modified by the designed process. The content of protein in camellia pollen is very high (27.3%), suggesting the possibility to introduce sufficient element nitrogen, which can promote the capacitive performance of the electrode in final products after carbonization. In this work, carbon materials derived from camellia pollen for supercapacitor electrode were prepared through a facile hydrothermal process with different amount of NH4BF4 followed by carbonization. The effects of NH4BF4 on the morphology, microstructure, the development of elemental state, texture structure as well as the electrochemical performance of the products were studied. Among the various products, the sample treated by 0.015g/mL NH4BF4 during the hydrothermal process showed the highest specific surface area as well as the largest specific capacity. Besides, doped-N also contribute to the final capacity. The cycle measurements demonstrated that it has excellent cycling stability after 10000 cycles.