Unique hierarchical porous carbon nanosheet network for supercapacitors: Ultra-long cycling stability and enhanced electroactivity of oxygen at high temperature

被引:10
|
作者
Qiu, Chuang [1 ]
Zuo, Mingyuan
Qiu, Daping [2 ]
Cao, Jiakai
Jia, Xuye [1 ]
Li, Yifan [1 ]
Liu, Changhe [1 ]
Chen, Nianhua [1 ]
Chen, Xiaohong [1 ]
Li, Min [1 ]
机构
[1] Beijing Univ Chem Technol, State Key Lab Chem Resource Engn, Beijing Key Lab Electrochem Proc & Technol Mat, Beijing 100029, Peoples R China
[2] Peking Univ, Beijing Innovat Ctr Engn Sci & Adv Technol, Sch Mat Sci & Engn, Beijing Key Lab Magnetoelectr Mat & Devices, Beijing 100871, Peoples R China
基金
中国国家自然科学基金;
关键词
Hierarchical porous carbon; High -temperature performance; Electroactivity of oxygen; Pore structure; Supercapacitors; TEMPLATE;
D O I
10.1016/j.electacta.2022.141522
中图分类号
O646 [电化学、电解、磁化学];
学科分类号
081704 ;
摘要
Porous carbon-based supercapacitors (SCs) are promising electrochemical energy storage devices. However, the unreasonable design of porous carbon leads to poor energy density and unsatisfactory high-temperature cycling stability of SCs. Herein, we synthesize a hierarchical porous carbon nanosheet network by combining selftemplated pyrolysis and KOH activation strategies. This carbon nanosheet network exhibits an extremely large active ion-accessible pore volume (V0.76-6 nm=1.654 m3 g-1) and a considerable supermesopore volume (V6-50nm 0.413 m3 g-1), which provide abundant active sites and fast diffusion channels for electrolyte ions, respectively. Futhermore, the enhanced electroactivity of oxygen at high temperature is demonstrated, which provides additional active sites. Inspiringly, the as-constructed EMIMBF4-based SCs can be well serviced at the high temperature of 80 degrees C with ultra-high energy/power density of 122.23 Wh kg- 1/40.6 kW kg- 1 and superior durability (81.1% retention after 8000 cycles at 20 A g-1). This work provides insights into the effect of temperature on the electroactivity of oxygen, as well as the construction of porous carbon-based high-temperature SCs with desired performance metrics.
引用
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页数:8
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