Enhanced faradaic capacitance can be achieved by using a metallic heterostructure as a result of the intrinsic activity of the electrodes. Optimizing the multimetallic heterostructure is key to improving the intrinsic activity of the electrodes. Herein, a consolidated strategy of a multimetallic design with predominantly nickel, cobalt, and zinc centers on multiwalled nanotubes was developed via pyrolysis of a trimetallic metal–organic framework at 800 °C. The resulting C-ZIF-800 material offers a multiwalled nanotube-like structure that facilitates the encapsulation of multimetallic sites with predominantly nickel and cobalt centers on a nanotube-like N–C interface. XRD, HRTEM, XPS, and EXAFS spectroscopic analysis support the metallic valence state of the Ni and Co centers encapsulated in the N–C nanotubes. C-ZIF-800 offers an outstanding specific capacitance of 849.47 F g⁻¹ at a current density of 1 A g⁻¹. Based on three-electrode electrochemical measurements, an asymmetric supercapacitor (ASC) device (C-ZIF-800//AC) was fabricated with a wide potential window of 1.7 V. The device offers an excellent specific capacity of 599.7 C g⁻¹ at 0.25 A g⁻¹ with an exceptional energy density of 141.59 W h kg⁻¹ at a power density of 212.5 W kg⁻¹, and remaining 4250 W kg⁻¹ after retaining 81.93 W h kg⁻¹ of energy density. The as-fabricated device demonstrated its excellent potential for future energy storage applications by illuminating a red LED light for 60 min by combining two devices in series.

中文翻译：

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多层纳米管封装镍钴双金属位点的高性能非对称超级电容器装置

由于电极的固有活性，可以通过使用金属异质结构来实现增强的法拉第电容。优化多金属异质结构是提高电极本征活性的关键。在此，开发了一种多金属设计的综合策略，该策略主要是在多壁纳米管上以镍、钴和锌为中心三金属金属有机骨架在 800 °C 下的热解。由此产生的 C-ZIF-800 材料提供了多壁纳米管状结构，有利于在纳米管状 N-C 界面上封装主要以镍和钴为中心的多金属位点。XRD、HRTEM、XPS 和 EXAFS 光谱分析支持封装在 N-C 纳米管中的 Ni 和 Co 中心的金属价态。^{C-ZIF-800 在 1 A g -1}的电流密度下具有 849.47 F g ^-1的出色比电容。基于三电极电化学测量，制备了具有 1.7 V 宽电位窗口的非对称超级电容器 (ASC) 器件 (C-ZIF-800//AC)。该^器件在0.25银克^-1，在功率密度为212.5 W kg ^{-1时具有141.59 W h kg -1}的优异能量密度，并且在保留81.93 W h kg ^-1能量密度^{后剩余4250 W kg -1 。}通过将两个器件串联起来，使红色 LED 灯亮 60 分钟，所制造的器件展示了其在未来储能应用中的巨大潜力。