Preparation of Porous Activated Carbons for High Performance Supercapacitors from Taixi Anthracite by Multi-Stage Activation.
Coal-based porous materials for supercapacitors were successfully prepared using Taixi anthracite (TXA) by multi-stage activation. The characterization and electrochemical tests of activated carbons (ACs) prepared in different stages demonstrated that the AC from the third-stage activation (ACIII) shows good porous structures and excellent electrochemical performances. ACIII exhibited a fine specific capacitance of 199 F g-1 at a current density of 1 A g-1 in the three-electrode system, with 6 mol L-1 KOH as the electrolyte. The specific capacitance of ACIII remained 190 F g-1 even despite increasing the current density to 5 A g-1, indicating a good rate of electrochemical performance. Moreover, its specific capacitance remained at 98.1% of the initial value after 5000 galvanostatic charge-discharge (GCD) cycle tests at a current density of 1 A g-1, suggesting that the ACIII has excellent cycle performance as electrode materials for supercapacitors. This study provides a promising approach for fabricating high performance electrode materials from high-rank coals, which could facilitate efficient and clean utilization of high-rank coals.
['Yue|Xiao-Ming|XM|', 'An|Zhao-Yang|ZY|', 'Ye|Mei|M|', 'Liu|Zi-Jing|ZJ|', 'Xiao|Cui-Cui|CC|', 'Huang|Yong|Y|', 'Han|Yu-Jia|YJ|', 'Zhang|Shuang-Quan|SQ|', 'Zhu|Jun-Sheng|JS|']
D002606:Charcoal D003031:Coal D025802:Electric Capacitance D004563:Electrochemistry D004566:Electrodes D018625:Microscopy, Atomic Force D010316:Particle Size D016062:Porosity D013499:Surface Properties
activated carbon supercapacitor multi-stage activation electrochemical performance coal-based electrodes