Hongxia Gao , Yikun Li , Xueyan Wu , Yan Lv , Chunmei Ma , Yanchun Pei , Na Liang , Fanze Meng , Pengfei Dong , Jixi Guo
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引用次数: 0
摘要
孔结构是影响活性炭基超级电容器性能的关键参数。然而,传统的活性炭高温热处理工艺耗时长、耗能大、易破坏孔隙结构。本文采用闪蒸焦耳加热方法在20 s内制备出具有通孔结构的AC,缩短了电解质离子的传输距离,解决了大比表面积(1039 m2 g−1)下电吸附动力学变慢的问题。此外,快速活化过程有助于防止KOH对杂原子的腐蚀,使杂原子含量高于管炉,增加了赝电容。基于这些,电极材料在1ag−1时表现出313.7 F g−1的高比电容。对称型超级电容器在6mkoh下循环10000次后,比电容保持率达到99.8%。用1 M TEATFB/AN电解液将所制备的交流电组装成纽扣电池,在748.5 W kg−1的功率密度下可提供57.8 Wh kg−1的良好能量密度和3v的宽电压窗。该方法为碳基电极材料的快速制备提供了广阔的前景。
Ultrafast activation to form through-hole carbon facilitates ion transport for high specific capacity supercapacitors
The pore structure is the critical parameter affecting the performance of activated carbon (AC) based supercapacitors. However, most conventional high-temperature thermal treatment of AC is time-consuming, energetically demanding, and easy destroyed of pore structure. Here, the AC with through-hole structure is prepared by flash Joule heating method within 20 s, shortens the transport distance of electrolyte ions, solves the problem of slowing down the electro-adsorption kinetics with large specific surface area (1039 m2 g−1). In addition, the rapid activation process helps to prevent the etching of heteroatoms by the KOH, so that the content of heteroatom is higher than tube furnace, and the pseudocapacitance is increased. Based on these, electrode material exhibits high specific capacitance of 313.7 F g−1 at 1 A g−1. Symmetrical supercapacitor reveals specific capacitance retention of 99.8 % after 10000 circles in 6 M KOH. The prepared AC is assembled into a button cell by using 1 M TEATFB/AN electrolyte, it delivers good energy density of 57.8 Wh kg−1 at the power density of 748.5 W kg−1, and a wide voltage window of 3 V. This strategy offers a broad prospect for rapid preparation of carbon-based electrode materials.
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