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Polypyrrole nanowire modified graphite (PPy/G) electrode used in capacitive deionization
Authors:Yujie Zhang  Yue Wang  Shichang Xu  Jixiao Wang  Zhi Wang  Shichang Wang
Affiliation:1. Chemical Engineering Research Center, School of Chemical Engineering and Technology, Tianjin University, Tianjin 300072, PR China;2. State Key Lab of Chemical Engineering, Tianjin Univesity, Tianjin 300072, PR China;3. Tianjin Key Lab of Membrane Science and Desalination Technology, Tianjin University, Tianjin 300072, PR China
Abstract:With high specific capacitance and good conductivity, polypyrrole nanowire modified graphite (PPy/G) electrode has great promising applications in capacitive deionization (CDI). Preparation parameters of modified electrode such as concentration of supporting electrolyte solution (LiClO4), concentration of monomer (pyrrole, Py), pH of polymerization medium, polymerization potential and time have significant effects on the electrode adsorption capacity of NaCl. The experimental results indicate that the optimal preparation condition of the PPy/G electrode used for CDI is 0.10 M LiClO4, 0.19 M Py and pH 5.91 which was controlled by phosphates buffer solution (PBS, 0.10 M), polymerized at 0.85 V vs saturated calomel electrode (SCE) with polymerization time of 150 s. The obtained electrode has an area specific capacitance of 0.188 F/cm2 determined by cyclic voltammetry (CV) method in 1.0 M HClO4 at a scanning rate of 0.05 V/s. In addition, the desalination experiments of the electrode were carried out in 500 ppm NaCl solution at a working voltage of 1.4 V. The experimental results indicate that the NaCl can be removed from the feed solution by electroadsorbing of the electrode with good desalination stability and the electrode can be regenerated efficiently by its electrodesorbing.
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