Rathore Hem Kanwar, Das Chanchal, Biswas Goutam, Kumar Manish, Sankhala Sunil Kumar, Sarkar Debasish
Department of Physics, Malaviya National Institute of Technology Jaipur, Rajasthan 302017 India; Defence Laboratory, DRDO, Jodhpur, Rajasthan 342011, India.
Department of Chemistry, Cooch Behar Panchanan Barma University, West Bengal 736101, India.
J Colloid Interface Sci. 2025 May;685:280-290. doi: 10.1016/j.jcis.2025.01.142. Epub 2025 Jan 18.
Designing advanced materials that effectively mitigate the poor cycle life of battery-type electrodes with high specific capacities is crucial for next-generation energy storage systems. Herein, graphene oxide-ceria (GO-CeO) nanocomposite synthesized via a facile wet chemical route is explored as cathode for high-performance supercapacitors. The morphological analysis suggests fine ceria (CeO) nanoparticles dispersed over ultrathin graphene oxide (GO) sheets while structural studies reveal face-centered cubic phase of CeO in the nanocomposite. In-depth electrochemical performance investigation of the nanocomposite in 6 M KOH aqueous electrolyte demonstrated its excellent battery-type behavior with least ion diffusion resistance and a superior cycle life resulting from the synergistic effect of redox-active CeO and 2D GO with abundant oxygen functionalities. Specifically, GO-CeO composite electrode delivered a maximum specific capacitance of 625.9 F/g (52.2 mAh/g) at 3 A/g current density, which is substantially higher than the capacitance values obtained for GO and CeO electrodes, and demonstrated an excellent cycling stability with ∼ 100 % capacitance retention after 10,000 CV cycles. Furthermore, a novel aqueous asymmetric supercapacitor (ASC) is explored with GO-CeO as positive and iron(III) oxyhydroxide (FeOOH) as negative electrode material in 6 M KOH electrolyte which has also displayed good energy-power density combination along with excellent cycle stability. The study thus endorses rational design of nanocomposite materials with suitable functionalities as an excellent strategy in augmenting the performance of futuristic energy storage devices.
设计出能有效缓解高比容量电池型电极循环寿命短这一问题的先进材料，对于下一代储能系统至关重要。在此，通过简便的湿化学路线合成的氧化石墨烯-二氧化铈（GO-CeO）纳米复合材料被探索用作高性能超级电容器的阴极。形态分析表明，细小的二氧化铈（CeO）纳米颗粒分散在超薄的氧化石墨烯（GO）片上，而结构研究揭示了纳米复合材料中CeO的面心立方相。在6 M KOH水性电解质中对该纳米复合材料进行的深入电化学性能研究表明，由于具有氧化还原活性的CeO和具有丰富氧官能团的二维GO的协同效应，其具有出色的电池型行为，离子扩散电阻最小，循环寿命优异。具体而言，GO-CeO复合电极在3 A/g电流密度下的最大比电容为625.9 F/g（52.2 mAh/g），大大高于GO和CeO电极获得的电容值，并在10,000次循环伏安循环后表现出出色的循环稳定性，电容保持率约为100%。此外，还探索了一种新型的水性不对称超级电容器（ASC），在6 M KOH电解质中，以GO-CeO为正极，氢氧化氧铁（FeOOH）为负极材料，该超级电容器也表现出良好的能量-功率密度组合以及出色的循环稳定性。因此，该研究认可了合理设计具有合适功能的纳米复合材料，作为提高未来储能设备性能的一种出色策略。
