Salarizadeh Parisa, Askari Mohammad Bagher, Hooshyari Khadijeh, Saeidfirozeh Homa
High-Temperature Fuel Cell Research Department, Vali-e-Asr University of Rafsanjan 1599637111, Rafsanjan, Iran.
Nanotechnology. 2020 Oct 23;31(43):435401. doi: 10.1088/1361-6528/aba1bd. Epub 2020 Jul 1.
Today, two-dimensional materials for use in energy devices have attracted the attention of researchers. Molybdenum disulfide is promising as an electrode material with unique physical properties and a high exposed surface area. However, there are still problems that need to be addressed. In this study, we prepared a hybrid containing MoS, FeO, and reduced graphene oxide (rGO) by a two-step hydrothermal method. This nanocomposite is well structurally and morphologically identified, and its electrochemical performance is then evaluated for use in supercapacitors. According to the galvanostatic charge-discharge results, this nanocomposite shows a good specific capacity, equivalent to 527 F g at 0.5 mA cm. The results of the multi-cycle stability test (5000 cycles) indicate a significant stability rate capability, with 93% of the electrode capacity remaining after 5000 cycles. The reason for this could be the synergistic effect between rGO and MoS as well as between molybdenum and iron in the faradic reaction in the charge storage process. FeO and MoS provide electroactive sites for the faradic process and electrolyte accessibility and rGO supply conductivity.
如今，用于能源设备的二维材料已引起研究人员的关注。二硫化钼作为一种具有独特物理性质和高暴露表面积的电极材料很有前景。然而，仍存在一些需要解决的问题。在本研究中，我们通过两步水热法制备了一种包含MoS、FeO和还原氧化石墨烯（rGO）的复合材料。对这种纳米复合材料的结构和形态进行了很好的鉴定，然后评估其在超级电容器中的电化学性能。根据恒电流充放电结果，这种纳米复合材料显示出良好的比容量，在0.5 mA cm时相当于527 F g。多循环稳定性测试（5000次循环）结果表明其具有显著的稳定性速率能力，5000次循环后电极容量仍保留93%。其原因可能是在电荷存储过程中的法拉第反应中，rGO与MoS之间以及钼与铁之间的协同效应。FeO和MoS为法拉第过程提供电活性位点和电解质可及性，而rGO提供导电性。
