Preparation of Mesoporous-Dominated Hierarchical Porous Carbon Materials with Tailor-Made Microstructure and Notable Electrochemical Performance
摘要
Mesopore-dominated hierarchical porous carbons (MHPCs) with different microstructures were prepared by molten salt-assisted magnesiothermic reduction from a single carbon precursor. By adjusting the concentration of the carbon precursor (CaCO3) in molten salt, three different morphologies (hollow nanocube-, nanosheet-, and ginkgo leaf-structure) of the MHPCs were obtained with the ratio of mesoporous to total pore volume being above 92%. More interestingly, high specific surface areas, total pore volumes, and mesoporous volume were simultaneously obtained, with the maximum values being 2100 m2 g−1, 3.19 cm3 g−1, and 2.94 cm3 g−1, respectively, which are all the highest values reported so far by using magnesiothermic reduction. The unique microstructure makes it perform well as a working electrode in the supercapacitors. At 1 A g−1, a notable specific capacity of 178 F g−1 was observed, holding at 143 F g−1 even at 50 A g−1, exhibiting excellent capacitance retention (80.3%), as well as showing a good cycle performance for a capacity retention rate of 98.7% after 10000 cycles.