Molybdenum Carbide-Derived Chlorine-Doped Ordered Mesoporous Carbon with Few-Layered Graphene Walls for Energy Storage Applications
2017
Kou, Zongkui | Guo, Beibei | Zhao, Yufeng | Huang, Shifei | Meng, Tian | Zhang, Jie | Li, Wenqiang | Amiinu, Ibrahim Saana | Pu, Zonghua | Wang, Min | Jiang, Min | Liu, Xiaobo | Tang, Yongfu | Mu, Shichun
In this work, we propose a one-step process to realize the in situ evolution of molybdenum carbide (Mo₂C) nanoflakes into ordered mesoporous carbon with few-layered graphene walls (OMG) by chloridization and self-organization, and simultaneously the Cl-doping of OMG (OMG-Cl) by modulating chloridization and annealing processes is fulfilled. Benefiting from the improvement of electroconductivity induced by Cl-doping, together with large specific surface area (1882 cm² g–¹) and homogeneous pore structures, as anode of lithium ion batteries, OMG-Cl shows remarkable charge capacity of 1305 mA h g–¹ at current rate of 50 mA g–¹ and fast charge–discharge rate within dozens of seconds (a charge time of 46 s), as well as retains a charge capacity of 733 mA h g–¹ at a current rate of 0.5 mA g–¹ after 100 cycles. Furthermore, as a promising electrode material for supercapacitors, OMG-Cl holds the specific capacitances of 250 F g–¹ in 1 M H₂SO₄ solution and 220 F g–¹ at a current density of 0.5 A g–¹ in 6 M KOH solution, which are ∼40% and 20% higher than those of undoped OMG electrode, respectively. The high capacitive performance of OMG-Cl material can be due to the additional fast Faradaic reactions induced from Cl-doping species.
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