Nanotechnology Research Laboratory, Faculty of Engineering Sciences, GIK Institute of Engineering Sciences and Technology, Topi 23640, Khyber Pakhtunkhwa, Pakistan.
Nanotechnology Research Laboratory, Faculty of Engineering Sciences, GIK Institute of Engineering Sciences and Technology, Topi 23640, Khyber Pakhtunkhwa, Pakistan.
Ultrason Sonochem. 2019 Dec;59:104736. doi: 10.1016/j.ultsonch.2019.104736. Epub 2019 Aug 23.
An upsurge in sustainable energy demands has ultimately made supercapattery one of the important choice for energy storage, owing to highly advantageous energy density and long life span. In this work, novel strontium based mixed phased nanostructures were synthesized by using probe sonicator with sonication power 500 W at frequency of 20 kHz. The synthesized material was subsequently calcined at different temperature ranging from 200 to 800 °C. Structural and morphological analysis of the synthesized materials reveals the formation of mixed particle and rod like nanostructures with multiple crystal phases of strontium oxides and carbonates. Crystallinity, grain size and morphology of grown nanomaterials significantly improved with the increase of calcination temperature due to sufficient particle growth and low agglomeration. The electrochemical performance analysis confirms the redox activeness of the Sr-based electrode materials. Material calcined at 600 °C show high specific capacitance of 350 F g and specific capacity of 175 C g at current density of 0.3 A g due to less particle agglomeration, good charge transfer and more contribution of electrochemical active sites for redox reactions. In addition, the developed supercapattery of Sr-based nanomaterials//activated carbon demonstrated high performance with maximum energy density of 21.8 Wh kg and an excellent power density of 2400 W kg for the lower and higher current densities. Furthermore, the supercapattery retain 87% of its capacity after continuous 3000 charge/discharge cycles. The device characteristics were further investigated by analyzing the capacitive and diffusion controlled contributions. The versatile strategy of developing mixed phased nanomaterials pave the way to synthesize other transition metal based nanomaterials with superior electrochemical performance for hybrid energy storage devices.
可持续能源需求的增长最终使超级电容器成为储能的重要选择之一，因为它具有高能量密度和长寿命。在这项工作中，通过使用超声探头在 20 kHz 的频率下以 500 W 的超声功率合成了新型基于锶的混合相纳米结构。随后将合成的材料在 200 至 800°C 的不同温度下煅烧。合成材料的结构和形态分析表明，形成了具有多种锶氧化物和碳酸盐相的混合颗粒和棒状纳米结构。由于颗粒生长充分且团聚程度低，生长纳米材料的结晶度、晶粒尺寸和形态随着煅烧温度的升高而显著提高。电化学性能分析证实了 Sr 基电极材料的氧化还原活性。在 600°C 下煅烧的材料由于颗粒团聚较少、电荷转移良好以及更多的电化学活性位点参与氧化还原反应，表现出 350 F g 的高比电容和 175 C g 的比容量在 0.3 A g 的电流密度下。此外，基于 Sr 的纳米材料//活性炭开发的超级电容器在较低和较高电流密度下表现出高性能，最大能量密度为 21.8 Wh kg，功率密度为 2400 W kg。此外，该超级电容器在连续 3000 次充放电循环后仍保留 87%的容量。通过分析电容和扩散控制贡献进一步研究了器件特性。开发混合相纳米材料的多功能策略为用于混合储能器件的其他过渡金属基纳米材料的合成铺平了道路，具有优异的电化学性能。
