State Key Laboratory of Advanced Technology for Materials Synthesis and Processing, Wuhan University of Technology , Wuhan 430070, People's Republic of China.
Key Laboratory of Applied Chemistry, Yanshan University , Qinhuangdao 066004, People's Republic of China.
ACS Appl Mater Interfaces. 2017 Feb 1;9(4):3702-3712. doi: 10.1021/acsami.6b14440. Epub 2017 Jan 19.
In this work, we propose a one-step process to realize the in situ evolution of molybdenum carbide (MoC) 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 cm g) and homogeneous pore structures, as anode of lithium ion batteries, OMG-Cl shows remarkable charge capacity of 1305 mA h g at current rate of 50 mA g 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 at a current rate of 0.5 mA g after 100 cycles. Furthermore, as a promising electrode material for supercapacitors, OMG-Cl holds the specific capacitances of 250 F g in 1 M HSO solution and 220 F g at a current density of 0.5 A g 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.
在这项工作中，我们提出了一种一步法，通过氯化和自组织，将碳化钼（MoC）纳米片原位演化为具有少层石墨烯壁的有序介孔碳（OMG），并通过调节氯化和退火过程实现 OMG 的 Cl 掺杂（OMG-Cl）。受益于 Cl 掺杂引起的电导率提高，以及大的比表面积（1882 cm g）和均匀的孔结构，作为锂离子电池的阳极，OMG-Cl 在 50 mA g 的电流速率下表现出显著的 1305 mA h g 的充电容量，以及几十秒内的快速充放电速率（充电时间为 46 s），并且在 100 次循环后在 0.5 mA g 的电流速率下仍保持 733 mA h g 的充电容量。此外，作为超级电容器的一种有前途的电极材料，OMG-Cl 在 1 M HSO 溶液中的比电容为 250 F g，在 6 M KOH 溶液中的电流密度为 0.5 A g 时为 220 F g，分别比未掺杂的 OMG 电极高约 40%和 20%。OMG-Cl 材料的高电容性能可能归因于 Cl 掺杂物种引起的额外快速法拉第反应。
