This study aims to enhance the performance of supercapacitors, focusing particularly on optimizing electrode materials. While pure NiMn layered double hydroxides (LDHs) exhibit excellent electrochemical properties, they have limitations in achieving high specific capacitance. Therefore, this paper successfully synthesized composite materials of NiMn LDHs with varying loadings of graphene oxide (GO) using a hydrothermal method. Systematic physicochemical characterization of the synthesized materials, such as powder X-ray diffraction (XRD), X-ray photoelectron spectroscopy (XPS), field-emission scanning electron microscopy (FE-SEM), and Raman spectroscopy, revealed the influence of GO doping on the microstructure and electrochemical performance of NiMn LDHs. Electrochemical tests demonstrated that the NiMn LDHs/GO electrode material exhibited optimal electrochemical performance with a specific capacitance of 2096 F g-1 at 1 A g-1 current density and 1471 F g-1 at 10 A g-1, when GO doping level was 0.45 wt%. Furthermore, after 1000 cycles of stability testing, the material retained 53.3% capacitance at 5 A g-1, indicating good cyclic stability. This study not only provides new directions for research on supercapacitor electrode materials but also offers new strategies for developing low-cost and efficient electrode materials.

中文翻译：

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一步水热法合成NiMn层状双氢氧化物/氧化石墨烯复合材料增强超级电容器电化学性能


本研究旨在提高超级电容器的性能，特别关注优化电极材料。虽然纯 NiMn 层状双氢氧化物 (LDH) 表现出优异的电化学性能，但它们在实现高比电容方面存在局限性。因此，本文采用水热法成功合成了不同氧化石墨烯（GO）负载量的NiMn LDH复合材料。合成材料的系统物理化学表征，如粉末 X 射线衍射 (XRD)、X 射线光电子能谱 (XPS)、场发射扫描电子显微镜 (FE-SEM) 和拉曼光谱，揭示了 GO 掺杂的影响NiMn LDHs的微观结构和电化学性能的研究电化学测试表明，当 GO 掺杂水平相同时，NiMn LDHs/GO 电极材料表现出最佳的电化学性能，在 1 A g-1 电流密度下比电容为 2096 F g-1，在 10 A g-1 电流密度下比电容为 1471 F g-1。为0.45重量%。此外，经过1000次循环稳定性测试，该材料在5 A g-1下仍保持53.3%的电容，表明具有良好的循环稳定性。该研究不仅为超级电容器电极材料的研究提供了新方向，也为开发低成本、高效电极材料提供了新策略。