A melamine-assisted chemical blowing synthesis of N-doped activated carbon sheets for supercapacitor application
A melamine-assisted chemical blowing synthesis of N-doped activated carbon sheets for supercapacitor application
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DOI：
10.1016/j.jpowsour.2016.04.069
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发表时间：
2016-07
影响因子：
9.2
通讯作者：
Yiliang Wang;Huaqing Xuan;Gaoxin Lin;Fan Wang;Zhi Chen;Xiaoping Dong
中科院分区：
文献类型：
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作者：
Yiliang Wang;Huaqing Xuan;Gaoxin Lin;Fan Wang;Zhi Chen;Xiaoping Dong
以葡萄糖为碳源，采用三聚氰胺辅助化学发泡法和KOH活化法成功制备了氮掺杂活性炭片。所得到的碳材料具有厚度为10 μ m的片状形态、分级的微孔/介孔结构、高比表面积（高达1997.5m2 g-1）和高孔容（0.94cm3 g-1）。此外，由于双电层电容和赝电容的共同贡献，氮含量为3.06wt%的NACS材料在6 M KOH水溶液电解质中在0.5 A g-1的电流密度下呈现出312 F g-1的最大比电容。它还显示出良好的倍率性能（30 A g− 1时为246 F g−1）和循环稳定性（4000次恒电流充放电循环后保持率为91.3%）。组装的基于NACS的对称电容器在0-1.8 V的电压范围内在0.5 M Na 2SO 4水电解质中在448 W kg− 1的功率密度下表现出20.2 Wh kg− 1的最大能量密度。因此，独特的多孔片结构和氮掺杂特性赋予了电极材料在高性能超级电容器中的潜在应用。
N-doped activated carbon sheets (NACS) have been successfully synthesized using glucose as carbon source via melamine-assisted chemical blowing and sequent KOH-activation method. The obtained carbon material possesses a sheet-like morphology with ultrathin thickness, hierarchical micro/mesoporous structure, high specific surface area (up to 1997.5 m2g−1) and high pore volume (0.94 cm3g−1). Besides, NACS material with a nitrogen content of 3.06 wt% presents a maximum specific capacitance of 312 F g−1at a current density of 0.5 A g−1in 6 M KOH aqueous electrolyte due to the cocontribution of double layer capacitance and pseudocapacitance. It also displays good rate performance (246 F g−1at 30 A g−1) and cycle stability (∼91.3% retention after 4000 galvanostatic charge-discharge cycles). The assembled NACS-based symmetric capacitor exhibits a maximum energy density of 20.2 Wh kg−1at a power density of 448 W kg−1within a voltage range of 0–1.8 V in 0.5 M Na2SO4aqueous electrolyte. Thus, the unique porous sheet structure and nitrogen-doping characteristic endue the electrode material a potential application for high-performance supercapacitors.