Collaborative Innovation Center of Henan Province for Green Manufacturing of Fine Chemicals, Key Laboratory of Green Chemical Media and Reactions, Ministry of Education, School of Chemistry and Chemical Engineering, Henan Normal University, Xinxiang, Henan 453007, PR China; School of Chemistry and Chemical Engineering, Xinxiang University, Xinxiang, Henan 453003, PR China.
Collaborative Innovation Center of Henan Province for Green Manufacturing of Fine Chemicals, Key Laboratory of Green Chemical Media and Reactions, Ministry of Education, School of Chemistry and Chemical Engineering, Henan Normal University, Xinxiang, Henan 453007, PR China.
J Colloid Interface Sci. 2018 Aug 1;523:133-143. doi: 10.1016/j.jcis.2018.03.009. Epub 2018 Mar 5.
A facile potassium chloride salt-locking technique combined with hydrothermal treatment on precursors was explored to prepare nitrogen-doped hierarchical porous carbon sheets in air from biomass. Benefiting from the effective synthesis strategy, the as-obtained carbon possesses a unique nitrogen-doped thin carbon sheet structure with abundant hierarchical pores and large specific surface areas of 1459 m g. The doped nitrogen in carbon framework has a positive effect on the electrochemical properties of the electrode material, the thin carbon sheet structure benefits for fast ion transfer, the abundant meso-pores provide convenient channels for rapid charge transportation, large specific surface area and lots of micro-pores guarantee sufficient ion-storage sites. Therefore, applied for supercapacitors, the carbon electrode material exhibits an outstanding specific capacitance of 451 F g at 0.5 A g in a three-electrode system. Moreover, the assembled symmetric supercapacitor based on two identical carbon electrodes also displays high specific capacitance of 309 F g at 0.5 A g, excellent rate capacity and remarkable cycling stability with 99.3% of the initial capacitance retention after 10,000 cycles at 5 A. The synthesis strategy avoids expensive inert gas protection and the use of corrosive KOH and toxic ZnCl activated reagents, representing a promising green route to design advanced carbon electrode materials from biomass for high-capacity supercapacitors.
一种简便的氯化钾盐锁定技术与水热处理前驱体相结合，从生物质中在空气中制备氮掺杂分级多孔碳片。得益于有效的合成策略，所获得的碳具有独特的氮掺杂薄碳片结构，具有丰富的分级孔和 1459 m²/g 的大比表面积。碳骨架中的掺杂氮对电极材料的电化学性能有积极影响，薄碳片结构有利于快速离子转移，丰富的中孔为快速电荷传输提供了便利的通道，大比表面积和大量微孔保证了充足的离子储存位。因此，应用于超级电容器，碳电极材料在三电极系统中以 0.5 A/g 的电流密度下表现出 451 F/g 的出色比电容。此外，基于两个相同的碳电极的组装对称超级电容器在 0.5 A/g 的电流密度下也表现出 309 F/g 的高比电容、优异的倍率性能和显著的循环稳定性，在 5 A 下循环 10000 次后，初始电容保持率为 99.3%。该合成策略避免了昂贵的惰性气体保护以及腐蚀性 KOH 和有毒 ZnCl 活化试剂的使用，为从生物质设计用于高容量超级电容器的先进碳电极材料提供了一种有前景的绿色路线。
