Faculty of Chemistry, University of Mazandaran, Babolsar, Iran.
Faculty of Chemistry, University of Mazandaran, Babolsar, Iran.
Ultrason Sonochem. 2020 Apr;62:104869. doi: 10.1016/j.ultsonch.2019.104869. Epub 2019 Nov 18.
In the present study, Ni(VO)-reduced graphene oxide (NV/RGO) nanocomposite was synthesized for energy storage purpose. To this end, a mixture containing RGO nanosheets, Ni (CHCOOH) and NaVO mixture was prepared under probe-type ultrasonic irradiation with frequency of 20 KHz and the optimized power of 100 W. The Raman and energy-dispersive X-ray spectroscopies confirmed the presence of RGO nanosheets, nickel and vanadium elements in the NV/RGO, respectively. In addition, field emission-scanning electron microscopy (FESEM) data showed the formation of the NV nanoparticles on the RGO nanosheets. NV/RGO nanocomposite was pasted on nickel foam (NF) and its performance was investigated in energy storage using a three-electrode cell containing 6 M KOH. In cyclic voltammogram of NV/RGO/NF, redox peaks for Ni (II)/Ni (III) with intensities higher than that for NV/NF were observed which confirms the synergistic effect of RGO on the performance of NV. Chronopotentiometry data revealed that the NV/RGO/NF electrode exhibits high capacity of 117.22 mA h g at 2 A g. Electrochemical impedance spectroscopy also demonstrated an improvement in the electrical conductivity and electrochemical behavior of NV/RGO/NF nanocomposite compared to the RGO/NF and NV/NF. Furthermore, NV/RGO/NF electrode reserved about 88% of its initial capacity after 1000th potential cycle at 50 mV s. Overall, the results of our study suggest that the NV/RGO nanocomposite prepared in the presence of ultrasonic irradiation might be regarded as a suitable active material for energy storage systems.
在本研究中，为了储能目的合成了 Ni(VO)-还原氧化石墨烯（NV/RGO）纳米复合材料。为此，在频率为 20 kHz 和优化功率为 100 W 的探针式超声辐射下，制备了包含 RGO 纳米片、Ni(CHCOOH) 和 NaVO 混合物的混合物。拉曼和能谱分别证实了 NV/RGO 中 RGO 纳米片、镍和钒元素的存在。此外，场发射扫描电子显微镜（FESEM）数据表明，NV 纳米颗粒在 RGO 纳米片上形成。将 NV/RGO 纳米复合材料粘贴在镍泡沫（NF）上，并在包含 6 M KOH 的三电极电池中研究其储能性能。在 NV/RGO/NF 的循环伏安图中，观察到 Ni(II)/Ni(III) 的氧化还原峰，其强度高于 NV/NF，这证实了 RGO 对 NV 性能的协同作用。恒电流计时电位法数据表明，NV/RGO/NF 电极在 2 A/g 时具有 117.22 mA h/g 的高容量。电化学阻抗谱也表明，与 RGO/NF 和 NV/NF 相比，NV/RGO/NF 纳米复合材料的电导率和电化学行为得到了改善。此外，在 50 mV/s 时，经过 1000 次电位循环后，NV/RGO/NF 电极保留了其初始容量的约 88%。总的来说，我们的研究结果表明，在超声辐射存在下制备的 NV/RGO 纳米复合材料可能被视为储能系统的合适活性材料。
