Gong Qianxun, Huang Xiaoyan, Liu Yong, Zhang Sijie, Yu Tian
College of Physics, Sichuan University, Chengdu 610065, China.
Analytical & Testing Center, Sichuan University, Chengdu 610065, China.
Materials (Basel). 2025 Mar 14;18(6):1286. doi: 10.3390/ma18061286.
The fast development of portable electronics demands electrodes for supercapacitors that are compatible with miniaturized device applications. In this study, an orderly aligned coaxial bilayer nanotube array made of transition metal/transition metal oxides was adopted as a nanostructure-integrated electrode for applications as miniaturized micro-supercapacitors. Using Ni and NiO as our model materials, the corresponding Ni/NiO-CBNTA electrodes were fabricated using templated growth and post-thermal oxidation. The Ni shells served as parts of the 3D nano-architectured collector, providing a large specific surface area, and the pseudocapacitive NiO layers were directly attached and electrically connected to the collector without any additives. The vertical growth of orderly aligned Ni/NiO-CBNTAs successfully avoided the underutilization of capacitive nanomaterials and allowed the electrolyte to be fully accessed, which manifested full charge storage capabilities under the miniaturizing. It was demonstrated that Ni/NiO-CBNTAs can serve as miniaturized electrodes with an improved specific capacitance of 1125 F/g ≅ 3 A/g, which is comparable to that obtained in a massive load electrode prepared by the conventional slurry-coating technique.
便携式电子产品的快速发展需要与小型化设备应用兼容的超级电容器电极。在本研究中，由过渡金属/过渡金属氧化物制成的有序排列同轴双层纳米管阵列被用作纳米结构集成电极，以应用于小型化微型超级电容器。以镍和氧化镍作为模型材料，通过模板生长和后热氧化制备了相应的镍/氧化镍同轴双层纳米管阵列电极。镍壳作为三维纳米结构集流体的一部分，提供了较大的比表面积，并且赝电容性的氧化镍层直接附着并电连接到集流体上，无需任何添加剂。有序排列的镍/氧化镍同轴双层纳米管阵列的垂直生长成功避免了电容性纳米材料的未充分利用，并使电解质能够充分接触，这在小型化条件下表现出了完全的电荷存储能力。结果表明，镍/氧化镍同轴双层纳米管阵列可作为小型化电极，其比电容提高到1125 F/g ≅ 3 A/g，与通过传统浆料涂覆技术制备的大容量负载电极相当。
