Adhamash Ezaldeen, Pathak Rajesh, Qiao Qiquan, Zhou Yue, McTaggart Robert
Department of Electrical Engineering and Computer Science, South Dakota State University Brookings SD 57007 USA
Department of Physics, South Dakota State University Brookings SD 57007 USA
RSC Adv. 2020 Aug 13;10(50):29910-29917. doi: 10.1039/d0ra05764a. eCollection 2020 Aug 10.
Biochar carbon YP-50 exposed to gamma radiation at 50 kGy, 100 kGy, and 150 kGy was used as an electrode for an electric double-layer capacitor. The gamma radiation affected the pore structure and pore volume of the biochar electrodes. The optimized surface morphology, pore structure, and pore volume of the biochar with an irradiation dose of 100 kGy showed outstanding specific capacitance of 246.2 F g compared to the untreated biochar (115.3 F g). The irradiation dose of 100 kGy exhibited higher specific power and specific energy of 0.1 kW kg and 34.2 W h kg respectively, with a capacity retention of above 96% after 10 000 cycles at a current density of 2 A g. This improvement can be attributed to the decrease in average particle size, an increase in the porosity of biochar carbon. Besides, the charge transfer resistance of supercapacitor is significantly reduced from 21.7 Ω to 7.4 Ω after treating the biochar carbon with 100 kGy gamma radiation, which implies an increase in conductivity. This gamma radiation strategy to pretreat the carbon material for improving the properties of carbon materials can be promising for the development of high-performance supercapacitors for large-scale applications.
将生物炭碳YP - 50分别暴露于50千戈瑞、100千戈瑞和150千戈瑞的伽马辐射下，用作双电层电容器的电极。伽马辐射影响了生物炭电极的孔隙结构和孔隙体积。与未处理的生物炭（115.3 F/g）相比，辐照剂量为100千戈瑞的生物炭具有优化的表面形态、孔隙结构和孔隙体积，表现出出色的比电容，为246.2 F/g。100千戈瑞的辐照剂量分别表现出更高的比功率和比能量，分别为0.1 kW/kg和34.2 W h/kg，在2 A/g的电流密度下循环10000次后容量保持率高于96%。这种改善可归因于平均粒径的减小以及生物炭碳孔隙率的增加。此外，用100千戈瑞伽马辐射处理生物炭碳后，超级电容器的电荷转移电阻从21.7 Ω显著降低至7.4 Ω，这意味着导电性增加。这种用于预处理碳材料以改善碳材料性能的伽马辐射策略对于大规模应用的高性能超级电容器的开发可能具有广阔前景。
