Hierarchical porous carbon originated from the directing associated with activation as high-performance electrodes for supercapacitor and Li ion capacitor
Haisheng Du , Yin Yang , Chen Zhang, Yulong Li, Jiaran Wang, Kai Zhao, Changbo Lu, Dong Sun, Chun Lu, Shengli Chen, Xinlong Ma
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引用次数: 0
Abstract
A template-directing methodology combined with post-activation methodology is developed to synthesize hierarchical porous carbon (HPC) with a unique nanocage-like morphology and exceptional structural integrity, utilizing light MgO nanocapsules as templates and coal pitch as precursor. The specific surface area and pore volume of HPC can be precisely adjusted by varying the mass ratio between the chemical activator and PC. This optimized pore structure significantly enhances the kinetics of electrolyte ion diffusion, which is a crucial point for the high-performance supercapacitors. The superior capacitive energy-storage behavior with respect to capacitance and rate capability (168 and 160 F g−1 at 1 and 100 A g−1) can be delivered by HPC electrode as compared to commercial activated carbon and pristine PC. The great compatibility to high gravimetric and areal capacitances (173 F g−1 and 1391 mF cm−2) can still be achieved even at 8 mg cm−2 for HPC electrode. Moreover, a full hybrid Li ion capacitor fabricated using HPC, delivers outstanding rate capability, excellent Ragone performance, and exceptional cyclability, establishing the potential of this material for advanced energy storage systems. The successful integration of template-directed synthesis with activation techniques presents a scalable approach to convert coal pitch into high-performance electrode materials.
以轻氧化镁纳米胶囊为模板,煤沥青为前驱体,开发了一种模板导向法与后活化法相结合的方法,用于合成具有独特纳米囊状形态和优异结构完整性的分层多孔碳(HPC)。通过改变化学活化剂和 PC 之间的质量比,可以精确调节 HPC 的比表面积和孔体积。这种优化的孔隙结构大大提高了电解质离子扩散的动力学性能,而这正是高性能超级电容器的关键所在。与商用活性炭和原始 PC 相比,HPC 电极在电容和速率能力(1 A g-1 和 100 A g-1 时分别为 168 F g-1 和 160 F g-1)方面具有更优越的电容储能性能。即使在 8 毫克/厘米-2 的条件下,HPC 电极仍能达到很高的重度电容和等电容(173 F g-1 和 1391 mF cm-2)。此外,使用 HPC 制造的全混合锂离子电容器具有出色的速率能力、优异的拉格尼性能和卓越的循环性,从而确立了这种材料在先进储能系统中的应用潜力。模板指导合成与活化技术的成功结合,为将煤沥青转化为高性能电极材料提供了一种可扩展的方法。
期刊介绍:
The Journal of Power Sources is a publication catering to researchers and technologists interested in various aspects of the science, technology, and applications of electrochemical power sources. It covers original research and reviews on primary and secondary batteries, fuel cells, supercapacitors, and photo-electrochemical cells.
Topics considered include the research, development and applications of nanomaterials and novel componentry for these devices. Examples of applications of these electrochemical power sources include:
• Portable electronics
• Electric and Hybrid Electric Vehicles
• Uninterruptible Power Supply (UPS) systems
• Storage of renewable energy
• Satellites and deep space probes
• Boats and ships, drones and aircrafts
• Wearable energy storage systems