Hierarchical Porous Nitrogen-Doped Carbon Nanosheets Derived from Silk for Ultrahigh-Capacity Battery Anodes and Supercapacitors
Hierarchical Porous Nitrogen-Doped Carbon Nanosheets Derived from Silk for Ultrahigh-Capacity Battery Anodes and Supercapacitors
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DOI：
10.1021/nn506394r
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发表时间：
2015-03-01
期刊：
影响因子：
17.1
通讯作者：
Ma, Xilan
中科院分区：
文献类型：
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作者：
Hou, Jianhua;Cao, Chuanbao;Ma, Xilan
以生物质天然丝为原料，通过同时活化和石墨化制备了层次化多孔掺氮碳纳米片(HPNC)。所制备的HPNC-NS具有高比表面积(S比表面积：2494m(2)/g)、高孔道体积(2.28 cm(3)/g)、纳米片状结构、富N掺杂(4.7%)和缺陷等良好的电化学储能性能。考虑到这些特性的多重协同效应，已经制备了锂离子电池负极和双电极超级电容器。据报道，该材料的可逆储锂容量为1865 mA h/g，是目前所知的掺氮碳负极材料中最高的。在离子液体和电解液中，HPNC-NS超级电容器电极的比容量为242F/g，能量密度为102Wh/kg(48Wh/L)，具有很高的循环寿命稳定性(10000次循环后损失9%)。因此，通过一步简单的大规模合成路线，成功地将高性能的锂离子电池和超级电容器组装成相同的电极材料。它在下一代混合储能和可再生能源输送设备方面很有前途。
Hierarchical porous nitrogen-doped carbon (HPNC) nanosheets (NS) have been prepared via simultaneous activation and graphitization of biomass-derived natural silk. The as-obtained HPNC-NS show favorable features for electrochemical energy storage such as high specific surface area (S-BET: 2494 m(2)/g), high volume of hierarchical pores (2.28 cm(3)/g), nanosheet structures, rich N-doping (4.7%), and defects. With respect to the multiple synergistic effects of these features, a lithium-ion battery anode and a two-electrode-based supercapacitor have been prepared. A reversible lithium storage capacity of 1865 mA h/g has been reported, which is the highest for N-doped carbon anode materials to the best of our knowledge. The HPNC-NS supercapacitor's electrode in ionic liquid,electrolytes exhibit a capacitane of 242 F/g and energy density of 102 W h/kg (48W h/L), with high cycling life stability (9% loss after 10 000 cycles). Thus, a high-performance Li-ion battery and supercapacitors were successfully assembled for the same electrode material, which was obtained through a one-step and facile large-scale synthesis route. It is promising for next-generation hybrid energy storage and renewable delivery devices.