Okba Dina, Hassan Sameh, Abdel Aleem Abdel Aleem H, Shehab El-Din Mohamed T, El Tantawy El Sayed Ibrahim, Abou-Elyazed Ahmed S
Central Laboratory of Aquaculture Research, (CLER), Agricultural Research Center Sharqia Egypt.
Chemistry Department, Faculty of Science, Menoufia University Shebin El-Koom 13829 Egypt.
RSC Adv. 2025 Jan 10;15(2):795-805. doi: 10.1039/d4ra07779b. eCollection 2025 Jan 9.
Supercapacitors (SCs) are gaining attention in energy storage due to their high-power density, rapid charge/discharge ability, and long life cycle. Improving these features relies on developing advanced electrode materials with better energy storage properties. This study explores UiO-66, a zirconium-based metal-organic framework (MOF), which offers advantages like a large surface area, tunable pore sizes, and stability. However, its poor electrical conductivity limits its use in supercapacitors. Herein, we applied the Hummers' method to oxidize UiO-66, creating an oxidized form, H-UiO-66, with enhanced conductivity. This material was characterized by various techniques, including SEM-EDX, XRD, XPS, FTIR, and BET analysis, while electrochemical tests (GCD, CV, and EIS) confirmed a significant improvement in specific capacitance-82.8 F g for H-UiO-66 0.18 F g for pristine UiO-66 at 1 mA. These improvements stem from increased conductivity and electrochemical activity due to UiO-66 graphitization, highlighting the Hummers' method's effectiveness in transforming UiO-66 into a viable supercapacitor material.
超级电容器（SCs）因其高功率密度、快速充放电能力和长循环寿命而在能量存储领域受到关注。提升这些特性依赖于开发具有更好储能性能的先进电极材料。本研究探索了UiO-66，一种锆基金属有机框架（MOF），它具有诸如大表面积、可调节孔径和稳定性等优点。然而，其较差的导电性限制了它在超级电容器中的应用。在此，我们应用Hummers法氧化UiO-66，生成一种具有增强导电性的氧化形式H-UiO-66。该材料通过多种技术进行了表征，包括扫描电子显微镜-能谱分析（SEM-EDX）、X射线衍射（XRD）、X射线光电子能谱（XPS）、傅里叶变换红外光谱（FTIR）和比表面积分析（BET），而电化学测试（恒流充放电测试、循环伏安法和电化学阻抗谱）证实了比电容有显著提高——在1 mA时，H-UiO-66的比电容为82.8 F/g，原始UiO-66的比电容为0.18 F/g。这些改进源于UiO-66石墨化导致的导电性和电化学活性增加，突出了Hummers法在将UiO-66转化为一种可行的超级电容器材料方面的有效性。
