Bai Rui, Cao Yuan-Jia, Lu Cui-Ying, Liu Guang-Hui
Shaanxi Key Laboratory of Low Metamorphic Coal Clean Utilization, School of Chemistry and Chemical Engineering, Yulin University, Yulin, Shaanxi 719000, China.
Yulin Zhongke Innovation Institute For Clean Energy, Yulin, Shaanxi 719000, China.
ACS Omega. 2023 Sep 15;8(38):34471-34480. doi: 10.1021/acsomega.3c02610. eCollection 2023 Sep 26.
In this paper, with coal tar pitch as the carbon source, porous carbon (PC) was prepared by one-step carbonization. To improve the energy density of coal tar pitch-based porous carbon, MoS@PC was prepared by a hydrothermal method on a PC substrate. The effect of MoS loading on the structure and electrochemical properties of the sample was studied. The results show that the specific surface area of the MoS@PC-0.3 synthesized is 3053 m g, and the large specific surface area provides sufficient attachment sites for the storage of electrolyte ions. In the three-electrode system, the specific capacitance of MoS@PC-0.3 at 0.5 A g is 422.5 F g, and the magnification performance is 57.3% at 20 A g. After 10,000 charge/discharge cycles, the capacitance retention rate of the sample is 76.73%, with the Coulombic efficiency being 100%. In the two-electrode test system, the specific capacitance of MoS@PC-0.3 at 0.5 A g is 321.4 F g, with the power density and energy density being 500 W kg and 44.6 Wh kg, respectively. At a current density of 20 A g, the capacitance retention rate is 87.69% after 10,000 cycles. This study greatly improves the energy density of PC as the electrode material of supercapacitors.
本文以煤焦油沥青为碳源，通过一步碳化法制备了多孔碳（PC）。为提高煤焦油沥青基多孔碳的能量密度，采用水热法在PC基底上制备了MoS@PC。研究了MoS负载量对样品结构和电化学性能的影响。结果表明，合成的MoS@PC-0.3的比表面积为3053 m²/g，大比表面积为电解质离子存储提供了充足的附着位点。在三电极体系中，MoS@PC-0.3在0.5 A/g时的比电容为422.5 F/g，在20 A/g时的倍率性能为57.3%。经过10000次充放电循环后，样品的电容保持率为76.73%，库仑效率为100%。在两电极测试体系中，MoS@PC-0.3在0.5 A/g时的比电容为321.4 F/g，功率密度和能量密度分别为500 W/kg和44.6 Wh/kg。在20 A/g的电流密度下，经过10000次循环后电容保持率为87.69%。本研究大大提高了作为超级电容器电极材料的PC的能量密度。
