Nagaraju P, Vasudevan R, Alsalme A, Alghamdi A, Arivanandhan M, Jayavel R
Centre for Nanoscience and Technology, Anna University, Chennai-600025, Tamil Nadu, India.
Department of Physics, School of Arts and Science, AV campus, Vinayaka Mission's Research Foundation, Chennai-600105, Tamil Nadu, India.
Nanomaterials (Basel). 2020 Jan 17;10(1):160. doi: 10.3390/nano10010160.
NbO/graphene nanocomposites without any surfactant are synthesized by an in situ microwave irradiation technique. Structural and morphological studies revealed that the prepared composites were composed of NbO nanoparticles intercalated into the graphene sheet. The thermal stability of graphene oxide, NbO, and NbO/graphene nanocomposite was studied by the TGA. The electrochemical properties are assessed by cyclic voltammetry, chronopotentiometry and electrochemical impedance spectroscopy analyses. The specific capacitance of NbO/graphene nanocomposites is greater (633 Fg) than pure NbO nanoparticles (221 Fg) and graphene (290 Fg) at a current density of 1 Ag. The long-term cyclic measurement confirms higher cyclic stability of the nanocomposite with capacitance retention of 99.3% after 5000 cycles without performance degradation. The composites exhibit higher electrochemical conductivity and allow effective ions and charge transport over the entire electrode surface with aqueous electrolyte. The electrochemical study suggests that NbO/graphene nanocomposites have the potential to be an effective electrode for superior performance supercapacitor applications.
通过原位微波辐射技术合成了不含任何表面活性剂的氧化铌/石墨烯纳米复合材料。结构和形态学研究表明，所制备的复合材料由嵌入石墨烯片层的氧化铌纳米颗粒组成。通过热重分析（TGA）研究了氧化石墨烯、氧化铌和氧化铌/石墨烯纳米复合材料的热稳定性。通过循环伏安法、计时电位法和电化学阻抗谱分析评估了其电化学性能。在电流密度为1 A/g时，氧化铌/石墨烯纳米复合材料的比电容（633 F/g）大于纯氧化铌纳米颗粒（221 F/g）和石墨烯（290 F/g）。长期循环测量证实了该纳米复合材料具有更高的循环稳定性，在5000次循环后电容保持率为99.3%，且性能无降解。该复合材料表现出更高的电化学导电性，并能在水性电解质中使有效离子和电荷在整个电极表面传输。电化学研究表明，氧化铌/石墨烯纳米复合材料有潜力成为用于高性能超级电容器应用的有效电极。
