Yang Yang, Li Aijun, Cao Xi, Liu Fangfang, Cheng Siyu, Chuan Xiuyun
Key Laboratory of Orogenis Belts and Crustal Evolution, School of Earth and Space Sciences, Peking University Beijing 100871 China
Beijing Golden Feather Energy Technology Co., Ltd. Beijing 100095 China.
RSC Adv. 2018 Oct 18;8(62):35672-35680. doi: 10.1039/c8ra07062h. eCollection 2018 Oct 15.
A MoS/amorphous carbon composite was prepared using diatomite as a template and ammonium thiomolybdate/sucrose as starting materials. The composite perfectly inherits the template morphology with a porous structure, in which MoS possesses a structure with several layers, and amorphous carbon is partially inserted into the interlayer spaces of the MoS, inhibiting the restacking of the MoS nanosheets along the (002) plane. The interlaminar distance of the adjacent MoS nanosheets in the composite is 1.03 nm, which is approximately twice that between adjacent MoS and carbon layers. The supercapacitor utilizing this composite exhibits a high specific capacitance, 167.3 F g at the current density of 0.5 A g and high rate capability, 96.4 F g at 10 A g. Moreover, the capacitance retention is maintained at 93.2% after 1000 cycles, indicating excellent cycling stability. In contrast, the capacities of pure AC and MoS are much lower, and also the cyclability of MoS. The overall improvement in electrochemical performance could be ascribed to the unique microstructure and the close combination of MoS and amorphous carbon.
以硅藻土为模板，硫代钼酸铵/蔗糖为原料制备了MoS/非晶碳复合材料。该复合材料完美继承了模板的多孔结构形态，其中MoS具有多层结构，非晶碳部分插入到MoS的层间空间，抑制了MoS纳米片沿(002)面的重新堆叠。复合材料中相邻MoS纳米片的层间距为1.03 nm，约为相邻MoS与碳层之间层间距的两倍。利用该复合材料的超级电容器在电流密度为0.5 A g时表现出高比电容，为167.3 F g，在10 A g时具有高倍率性能，为96.4 F g。此外，经过1000次循环后电容保持率维持在93.2%，表明具有优异的循环稳定性。相比之下，纯活性炭和MoS的容量要低得多，MoS的循环性能也较差。电化学性能的整体提升可归因于独特的微观结构以及MoS与非晶碳的紧密结合。
