College of Environmental and Chemical Engineering, Heilongjiang University of Science and Technology, Harbin 150027, China.
Molecules. 2023 Jun 16;28(12):4804. doi: 10.3390/molecules28124804.
As fossil fuels gradually deplete, oil shale, one of the world's largest energy resources, has attracted much attention. Oil shale semi-coke (OSS) is the main byproduct of oil shale pyrolysis, which is produced in large quantities and causes severe environmental pollution. Therefore, there is an urgent need to explore a method suitable for the sustainable and effective utilization of OSS. In this study, OSS was used to prepare activated carbon by microwave-assisted separation and chemical activation, which was then applied in the field of supercapacitors. Raman, XRD, FT-IR, TEM, and nitrogen adsorption-desorption were adopted to characterize activated carbon. The results showed that ACF activated with FeCl-ZnCl/carbon as a precursor has larger specific surface area, suitable pore size, and higher degree of graphitization compared with the materials prepared by other activation methods. The electrochemical properties of several active carbon materials were also evaluated by CV, GCD, and EIS measurements. The specific surface area of ACF is 1478 m g, when the current density is 1 A g, the specific capacitance is 185.0 F g. After 5000 cycles of testing, the capacitance retention rate was as high as 99.5%, which is expected to provide a new strategy of converting waste products to low-cost activated carbon materials for high-performance supercapacitors.
随着化石燃料的逐渐枯竭，油页岩作为世界上最大的能源资源之一，引起了广泛关注。油页岩半焦（OSS）是油页岩热解的主要副产物，其产量大，对环境造成严重污染。因此，迫切需要探索一种适合油页岩半焦可持续有效利用的方法。本研究采用微波辅助分离和化学活化法，以油页岩半焦为原料制备活性炭，并将其应用于超级电容器领域。采用 Raman、XRD、FT-IR、TEM 和氮气吸附-脱附等方法对活性炭进行了表征。结果表明，以 FeCl-ZnCl/碳为前驱体制备的 ACF 具有比其他活化方法制备的材料更大的比表面积、适宜的孔径和更高的石墨化程度。通过 CV、GCD 和 EIS 测量对几种活性炭材料的电化学性能进行了评估。ACF 的比表面积为 1478 m g，在电流密度为 1 A g 时，比电容为 185.0 F g。经过 5000 次测试循环后，电容保持率高达 99.5%，有望为将废物转化为低成本、高性能超级电容器用活性炭材料提供新策略。
