Acid-free synthesis of oxygen-enriched electroactive carbon with unique square pores from salted seaweed for robust supercapacitor with attractive energy density
Acid-free synthesis of oxygen-enriched electroactive carbon with unique square pores from salted seaweed for robust supercapacitor with attractive energy density
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从咸海藻中无酸合成具有独特方孔的富氧电活性碳，用于具有有吸引力能量密度的坚固超级电容器
DOI：
10.1039/c8gc02349b
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发表时间：
2018-10
期刊：
影响因子：
9.8
通讯作者：
Hao Xiaogang
中科院分区：
文献类型：
--
作者：
Xue Chunfeng;Feng Lin;Hao Yanan;Yang Fujuan;Zhang Qian;Ma Xuli;Hao Xiaogang
富氧多孔电活性炭（OPEC）是通过简单的碳化盐渍海藻，只用水洗涤。重结晶的NaCl立方体是化学稳定的，并且主要用作原始海藻中的孔隙填料。它有助于维持固有的孔隙系统，同时模板形成方孔。它的屏蔽作用不仅提高了起始分解温度，而且有助于实现高产率。它也可以通过用绿色溶剂水洗涤而完全除去。所获得的OPEC-800材料不仅显示出329.3 m2 g-1的比表面积，而且还显示出与电解质1.0 M H2SO 4匹配的微孔结构（0.8-2.0 nm）。在三电极系统中，在0.50 A g−1的电流密度下，其比电容为324.3 F g−1（比表面积电容为98.5 μF cm−2）。其19.1%的高氧含量可以导致0.0-1.40 V的宽工作电压窗口和在双电极系统中175.0 W kg− 1的功率密度下15.9 W h kg − 1的有吸引力的能量密度。此外，它还显示出优异的循环稳定性（98%，10000次循环）和良好的倍率性能。 整个过程是一种绿色、无氧化剂、无酸和低成本的方法，用于将绿色生物质转化为具有天然连通孔的自功能化碳，旨在制造绿色能源器件。所有这些有吸引力的特征使得环境友好路线成为制备其他多孔电活性材料的有竞争力的候选者。
Oxygen-enriched porous electroactive carbon (OPEC) is prepared by simply carbonizing salted seaweed and only washing with water. The recrystallized NaCl cube is chemically stable and mainly acts as a pore filler in the pristine seaweed. It helps to maintain the innate pore system and simultaneously templates the formation of square pores. Its shielding effect not only enhances the onset decomposition temperature but also helps to achieve high yield. It can also be completely removed by washing with the green solvent water. The obtained OPEC-800 material not only shows a specific surface area of 329.3 m2 g−1 but also a microporous structure (0.8–2.0 nm) matching with the electrolyte 1.0 M H2SO4. It exhibits a specific capacitance of 324.3 F g−1 (specific surface-area capacitance is 98.5 μF cm−2) at a current density of 0.50 A g−1 in a three-electrode system. Its high oxygen content of 19.1% can lead to a wide operating voltage window of 0.0–1.40 V and an attractive energy density of 15.9 W h kg−1 at a power density of 175.0 W kg−1 in a two-electrode system. Furthermore, it also displays an excellent cyclic stability (98%, 10 000 cycles) and good rate performance. The whole process is a green, oxidant-free, acid-free, and low-cost method for converting green biomass into self-functionalized carbon with naturally connected pores aiming to fabricate green energy devices. All the attractive features make the environmentally friendly route a competitive candidate for preparing other porous electroactive materials.
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具有平衡微/介孔性的纳米级石墨碳，可用于具有卓越体积电容和循环性能的坚固超级电容器
影响因子：
6.6
作者：
Xue Chunfeng;Yang Fujuan;Wang Enyang;Feng Lin;Du Xiao;Hao Xiaogang;Li Xupeng
通讯作者：
Li Xupeng
影响因子：
32.5
作者：
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通讯作者：
Ogale, Satishchandra
影响因子：
32.5
作者：
Li, Zhi;Xu, Zhanwei;Mitlin, David
通讯作者：
Mitlin, David
影响因子：
32.5
作者：
Biswal, Mandakini;Banerjee, Abhik;Ogale, Satishchandra
通讯作者：
Ogale, Satishchandra
影响因子：
3.8
作者：
R. Conti;N. Jäger;J. Neumann;A. Apfelbacher;R. Daschner;A. Hornung
通讯作者：
R. Conti;N. Jäger;J. Neumann;A. Apfelbacher;R. Daschner;A. Hornung