Green and scalable synthesis of porous carbon nanosheet-assembled hierarchical architectures for robust capacitive energy harvesting
Green and scalable synthesis of porous carbon nanosheet-assembled hierarchical architectures for robust capacitive energy harvesting
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DOI：
10.1016/j.carbon.2019.06.059
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发表时间：
2019-11-01
期刊：
影响因子：
10.9
通讯作者：
Wu, Mingbo
中科院分区：
文献类型：
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作者：
Guan, Lu;Pan, Lei;Wu, Mingbo
多级碳结构为能量存储提供了极好的优势，但它们的一般合成需要繁琐的模板方法和随后使用高腐蚀性氢氧化钾作为活化剂的活化过程。在此，我们报告了使用柠檬酸钾作为绿色活化剂以及原位模板和石油沥青作为前体的纳米片组装分级碳结构的绿色和可规模化生产。用柠檬酸钾替代氢氧化钾不仅可以减少工业规模生产过程中对环境的不利影响，而且消除了传统策略中额外模板的必要性。同时，采用石油沥青作为碳前驱体可以提高碳的产率，从而降低建造此类结构的成本。所制备的碳结构显示出大的比表面积和分级孔隙率。此外，多孔碳纳米片有利于有效的电子/离子传输，从而允许高功率处理。由于这些结构优点，多孔碳纳米片组装的分层结构在大比电容、非凡的倍率性能和长循环稳定性方面具有出色的性能。这里展示的策略可能会为以具有成本效益的方式创建用于能源相关应用的新型碳纳米结构开辟新的可能性。 (C) 2019 Elsevier Ltd. 保留所有权利。
Hierarchical carbon architectures offer superb advantages for energy storage, but their general synthesis requires tedious template methods and subsequent activation processes employing highly corrosive potassium hydroxide as the activation agent. Herein, we report a green and scalable production of the nanosheet-assembled hierarchical carbon architecture using potassium citrate as a green activation agent as well as an in-situ template and petroleum asphalt as the precursor. The replacing potassium hydroxide with potassium citrate can not only reduce the adverse impact on environment during the industrially scalable production but also eliminate the necessity of extra templates in traditional strategies. Meanwhile, the employment of petroleum asphalt as the carbon precursor can increase the yield of carbon, thus reducing the cost for constructing such structures. The as-prepared carbon architecture shows large specific surface area and hierarchical porosity. Besides, the porous carbon nanosheet facilitates efficient electrons/ions transfer which permits high-power handling. Because of these structure merits, the porous carbon nanosheet-assembled hierarchical architecture affords outstanding performance in terms of large specific capacitance, extraordinary rate capability, and long cyclic stability. The strategy demonstrated here may open up new possibilities for creating novel carbon nanostructures for energy-related application in cost-effective manners. (C) 2019 Elsevier Ltd. All rights reserved.