Seminar
Tuesday, March 19, 2019 - 12:00am
Graduate Student Jiajie Li will present
"Novel biomass-derived porous carbon materials for supercapacitors"
on March 19, 2019 at 4:10pm in Neville Hall, room 3
As an efficient energy storage device, supercapacitor, has been intensively studied by researchers because of its prominent features, such as high power density, fast charge/discharge rate and excellent cycle stability. Although carbonaceous materials seem the most suitable for supercapacitor applications due to the advantages of high specific surface area, good conductivity, and moderate cost, the capacitance of carbon-based supercapacitor electrodes has remained at a mediocre level between 100 and 200 Fg-1 for decades1. Until recently, the development of biomass-derived porous carbon materials has presented the capacitance beyond 400 Fg-1 with the application of carbon materials for supercapacitors. Shi2 and co-workers presented a facile method to synthesize heteroatom-doped porous carbon electrode material by using the byproducts of bean curd stick through a process of hydrothermal carbonization, pre-carbonization and activation with KOH. Due to the hollow interconnected porous structure and abundant nitrogen- and oxygen-containing functional groups, the prepared materials achieved a specific surface area as high as 2609 m2g-1. Also, the materials as electrodes exhibited a relatively high energy density of 11.35 W h kg-1 in 6M KOH electrolyte with favorable rate performance and good cycling stability. Without any templates and chemical activation, Chen3and co-workers selected intrinsically nitrogen-rich bamboo shoots as a precursor to fabricate hierarchical porous N-doped carbon materials. With the comparison of produced samples, the SEM images, nitrogen adsorption/desorption isotherm and pore size distribution results all suggested that hydrothermal treatment process was essential for forming porous carbon materials with large surface area and nice nitrogen incorporation. Further XPS analysis and FT-IR spectra implied the carbonization temperature was also a significant factor for porous structure, surface contents and chemical states. The investigation of the promising sample in a three-electrode system showed an outstanding capacitance of 412 F/g in 6M KOH electrolyte and a long cycling stability, which indicated a potential way to utilize renewable and low-cost resources to produce high-performance electrodes for supercapacitors on a large scale. References [1] Liu, T., Zhang, F., Song, Y., Li, Y. (2017). Revitalizing carbon supercapacitor electrodes with hierarchical porous structures. J. Mater. Chem. A, 5(34), 17705-17733. doi:10.1039/C7TA05646J [2] Shi, L., Jin, L., Meng, Z., Sun, Y., Li, C., & Shen, Y. (2018). A novel porous carbon material derived from the byproducts of bean curd stick manufacture for high-performance supercapacitor use. RSC Advances, 8(70), 39937-39947. doi:10.1039/c8ra08664h [3] Chen, X., Zhang, J., Zhang, B., Dong, S., Guo, X., Mu, X., & Fei, B. (2017). A novel hierarchical porous nitrogen-doped carbon derived from bamboo shoot for high performance supercapacitor. Scientific reports, 7(1), 7362. doi:10.1038/s41598-017-06730-x