Jin Guimei, Zhou Qihang, Duan Zhiyuan, Shen Kaiyuan, Dong Zhiwei, Deng Shukang, Yang Peizhi
Yunnan Normal University, Yuhua District No. 1, Kunming 650500, China.
ACS Omega. 2024 Nov 20;9(48):47557-47566. doi: 10.1021/acsomega.4c06494. eCollection 2024 Dec 3.
Interfacial regulation is crucial for the enhancement of the specific surface area and supercapacitive performance in porous carbon materials. However, traditional porous carbon obtained through potassium hydroxide activation is confronted with a complicated preparation process. Herein, hierarchical porous biocarbons (HPBC) were facilely prepared by using the multiscale template method and wheat flour as a precursor without any activation. A spherical SiO template and wheat flour can be closely combined by gelatinization so as to effectively confine and spatially orient carbon materials. Benefiting from the hierarchical porous structure achieved through the use of templates at different sizes, HPBC-3 has the best electrochemical performance of 223.6 F·g at 1 A·g. Moreover, the assembled HPBC-3//HPBC-3 symmetrical supercapacitor demonstrates a remarkable energy density of 15.6 W h·kg and exhibits exceptional cycling performance with a capacitance retention rate of 106% after 5000 cycles. The results fully demonstrate the promising application of the obtained hierarchical porous carbon in supercapacitors.
界面调控对于提高多孔碳材料的比表面积和超级电容性能至关重要。然而，通过氢氧化钾活化获得的传统多孔碳面临着复杂的制备过程。在此，通过使用多尺度模板法并以小麦粉为前驱体，无需任何活化即可轻松制备出分级多孔生物碳（HPBC）。球形SiO模板和小麦粉可通过糊化紧密结合，从而有效地限制并使碳材料在空间上定向排列。受益于通过使用不同尺寸模板实现的分级多孔结构，HPBC-3在1 A·g时具有223.6 F·g的最佳电化学性能。此外，组装的HPBC-3//HPBC-3对称超级电容器表现出15.6 W h·kg的显著能量密度，并展现出优异的循环性能，在5000次循环后电容保持率为106%。结果充分证明了所制备的分级多孔碳在超级电容器中的应用前景广阔。
