Effect of varying the amount of binder on the electrochemical characteristics of palm shell activated carbon

International Technical Postgraduate Conference

Maarof, Hawaiah Imam^1,2 ; Wan Daud, Wan Mohd Ashri^1 ; Aroua, Mohamed Kheireddine^1

Department of Chemical Engineering, Faculty of Engineering, University of Malaya, Kuala Lumpur

50603, Malaysia^1

Faculty of Chemical Engineering, Universiti Teknologi MARA, Permatang Pauh, Pulau Pinang

13500, Malaysia^2

关键词: Double-layer capacitance;    Electrochemical applications;    Electrochemical characteristics;    Electrochemical spectroscopy;    Electrode reactions;    Electron-transfer resistance;    Palm shell-activated carbon;    Polytetrafluoroethylene (PTFE);   

Others  :  https://iopscience.iop.org/article/10.1088/1757-899X/210/1/012011/pdf
DOI  :  10.1088/1757-899X/210/1/012011

来源: IOP

【 摘 要 】

Polytetrafluoroethylene (PTFE) is among the most common binders used in the fabrication of an electrode, which is used for various electrochemical applications such as desalination, water purification, and wastewater treatment. In this study, the amount of the binder was varied at 10, 20, 30, and 40 wt% of the total mass of palm shell activated carbon (PSAC). The PSAC was used as the active material and carbon black was used as the conductive agent. The effect of different amounts of binder was observed by evaluating the electrochemical characteristics of the electrode through cyclic voltammetry (CV) and potentio electrochemical spectroscopy (PEIS). The CV analysis was employed to determine the geometric area normalised electrode double layer capacitance, CE, and the electrode reaction of the prepared electrode. Meanwhile, the common redox probe, ferro/ferricyanide in 0.5 M NaCl, was employed to estimate the electron transfer resistance through PEIS. The electrochemical characterisation proved that the optimum amount of PTFE was 20 wt% for the 4:1 ratio of active material to conductive agent. On increasing the amount of the binder to 30 wt% and 40 wt%, the estimated value of CEdecreased and remained almost equivalent. Adding more than 30 wt% of binder resulted in pore blockage and reduced the available active site on the PSAC electrode. In addition, the electron transfer resistance of the prepared electrode was found to be in the range of 4-5 •cm2.