Effect of deashing approach on pore structure and electrochemical performance of activated carbons
The effect of deashing approache on pore size distribution and electrochemical performance of potassium humate based activated carbons was investigated.The as-prepared activated carbons that were deashed before or after carbonization of potassium humate at 700 ℃for 1 h under N2 atmosphere are denoted as AC1,AC2,respectively.As a comparison,the AC3 was prepared from commercial potassium humate without deashing treatment.The pore structure and morphology of as-prepared activated carbons were characterized by low temperature N2 adsorption and scanning electron microscope.The capacitive behaviors were further stud-ied by galvanostatic charge/discharge,cyclic voltammetry,leakage current and electrochemical impedance spectroscopy.It was found that deashing before carbonization can create the micropores in the range of 0-1.2 nm,while deashing after carbonization ex-hibits the use of template and be more helpful to the formation of mesopores(2.0-10.2 nm).Meanwhile,the AC1 based electrodes exhibit specific capacitance with value of 164 F/g at a current density of 50 mA·g-1,excellent cycling stabilities,lower interfacial electron transfer resistance and lower leakage current value(13.5 μA).
Potassium humate Deashing Pore structure Carbonization Template
Weiwei Kang Guangxu Huang Baolin Xing Lunjian Chen Chuanxiang Zhang
Henan Polytechnic University,Henan,Jiaozuo 54000,China
国内会议
长沙
英文
1-6
2015-11-05（万方平台首次上网日期，不代表论文的发表时间）