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Aqueous supercapacitors based on carbonized silk electrodes†
RSC Advances ( IF 3.9 ) Pub Date : 2018-06-15 00:00:00 , DOI: 10.1039/c8ra01988f Limei Zhang 1 , Zhaohui Meng 1 , Qiaoyun Qi 1 , Wen Yan 1 , Naibo Lin 1 , Xiang Yang Liu 1, 2
RSC Advances ( IF 3.9 ) Pub Date : 2018-06-15 00:00:00 , DOI: 10.1039/c8ra01988f Limei Zhang 1 , Zhaohui Meng 1 , Qiaoyun Qi 1 , Wen Yan 1 , Naibo Lin 1 , Xiang Yang Liu 1, 2
Affiliation
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Graphitic nitrogen-doped hierarchical porous carbon nanosheets for supercapacitor application were derived from an easily obtained and green silk by simultaneous ZnCl2 activation and FeCl3 graphitization at different heating temperatures. By increasing the heating temperature from 700 to 850 °C, the degree of graphitization and BET surface area rose to their highest levels, while the nitrogen doping content was maintained at 2.24 wt%. Carbonized silk at 850 °C displays a nanosheet morphology and a considerable specific surface area (1285.31 m2 g−1), and it was fabricated into a supercapacitor as an electrode material, exhibiting superior electrochemical performance with a high specific capacitance of 178 F g−1 at 0.5 A g−1 and an excellent rate capability (81% capacitance retention ratio even at 20 A g−1) in 1 mol L−1 H2SO4 electrolyte. A symmetric supercapacitor using carbonized silk at 850 °C as the electrodes has an excellent specific energy of 14.33 W h kg−1 at a power density of 251 W kg−1 operated over a wide voltage range of 2.0 V in aqueous neutral Na2SO4 electrolyte.
中文翻译：
基于碳化丝电极的水性超级电容器†
用于超级电容器应用的石墨氮掺杂分级多孔碳纳米片是通过在不同加热温度下同时进行ZnCl 2活化和FeCl 3石墨化而从容易获得的绿色丝中衍生出来的。通过将加热温度从700℃提高到850℃，石墨化程度和BET表面积升至最高水平，而氮掺杂含量保持在2.24wt%。 850℃下的碳化丝呈现出纳米片形貌和相当大的比表面积（1285.31 m 2 g -1 ），将其制成超级电容器作为电极材料，表现出优异的电化学性能，比电容高达178 F g -1 at 0.5 A g -1 ，并且在1 mol L -1 H 2 SO 4电解液中具有优异的倍率性能（即使在20 A g -1时也具有81%的电容保持率）。使用 850 °C 碳化丝作为电极的对称超级电容器在中性 Na 2 SO 水溶液中、在 2.0 V 的宽电压范围内工作、功率密度为 251 W kg −1时具有 14.33 W h kg −1的优异比能量4电解质。
更新日期：2018-06-15
中文翻译：
基于碳化丝电极的水性超级电容器†
用于超级电容器应用的石墨氮掺杂分级多孔碳纳米片是通过在不同加热温度下同时进行ZnCl 2活化和FeCl 3石墨化而从容易获得的绿色丝中衍生出来的。通过将加热温度从700℃提高到850℃，石墨化程度和BET表面积升至最高水平，而氮掺杂含量保持在2.24wt%。 850℃下的碳化丝呈现出纳米片形貌和相当大的比表面积（1285.31 m 2 g -1 ），将其制成超级电容器作为电极材料，表现出优异的电化学性能，比电容高达178 F g -1 at 0.5 A g -1 ，并且在1 mol L -1 H 2 SO 4电解液中具有优异的倍率性能（即使在20 A g -1时也具有81%的电容保持率）。使用 850 °C 碳化丝作为电极的对称超级电容器在中性 Na 2 SO 水溶液中、在 2.0 V 的宽电压范围内工作、功率密度为 251 W kg −1时具有 14.33 W h kg −1的优异比能量4电解质。
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