Thakur A V, Malpure S G, Krishnamurthy Manjunath Nookala
RRU 709, Department of Clinical Pharmacology, Advanced Centre for Training, Research and Education in Cancer, Kharghar, Navi Mumbai, India.
Homi Bhabha National Institute, Mumbai, Maharashtra, India.
Discov Nano. 2025 Sep 8;20(1):155. doi: 10.1186/s11671-025-04349-w.
In this study, we investigated the influence of ultrasonic frequency during ultrasound-assisted chemical bath deposition (UCBD) on the surface morphology and electrochemical performance of CoO:MnO@CoMnO composite flexible electrodes for supercapacitor applications. By systematically varying the ultrasonic frequency (1.0-2.5 MHz), a significant modulation in surface architecture from dispersed nanoflakes to densely packed marigold-like structures was achieved. Field emission scanning electron microscopy (FESEM) and contact angle analysis confirmed improved surface ordering and wettability with increasing frequency. Electrochemical analyses demonstrated that electrodes fabricated at 2.5 MHz (F4) exhibited the highest specific capacitance (SC) of 722.27 Fg at 2 mVs, attributable to enhanced electroactive surface area and reduced ion diffusion resistance. The symmetric supercapacitor device (SSD) assembled using these electrodes achieved SC of 840.35 Fg, alongside excellent cycling stability, retaining 90.49% of its initial capacitance after 3000 cycles. These results highlight the efficacy of ultrasonic modulation in tailoring nanostructured electrode surfaces for next-generation energy storage devices.
在本研究中，我们研究了超声辅助化学浴沉积（UCBD）过程中的超声频率对用于超级电容器应用的CoO:MnO@CoMnO复合柔性电极的表面形态和电化学性能的影响。通过系统地改变超声频率（1.0 - 2.5 MHz），实现了表面结构从分散的纳米片到紧密堆积的金盏花状结构的显著调制。场发射扫描电子显微镜（FESEM）和接触角分析证实，随着频率增加，表面有序性和润湿性得到改善。电化学分析表明，在2.5 MHz（F4）下制备的电极在2 mV s时表现出最高比电容（SC）722.27 F g，这归因于电活性表面积的增加和离子扩散电阻的降低。使用这些电极组装的对称超级电容器器件（SSD）实现了840.35 F g的比电容，同时具有出色的循环稳定性，在3000次循环后保留了其初始电容的90.49%。这些结果突出了超声调制在为下一代储能器件定制纳米结构电极表面方面的有效性。
