Binder-less assembly of polyphosphate graphene on nickel foam for capacitive deionization
Paper ID : 1433-ICNS
Authors:
Majid Talebi1, M. M. Ahadian1, Saeed Shahrokhian *2
1Institute for Nanoscience & Nanotechnology (INST),Sharif University of Technology,Azadi Avenue,P.O. Code: 14588-89694,Tehran, IRAN
2Department of Chemistry, Sharif University of Technology, tehran, Iran
Abstract:
In this paper, a simple method is being introduced for preparation of polyphosphate graphene on Ni foam substrate (Ni/PPGr). The resulting Ni/PPGr electrode is characterized using various techniques such as SEM and FTIR. According to the FTIR spectra and SEM images, a hierarchically porous polyphosphate structure was formed on a 3D assembly of graphene for the electrode. Then, the Ni/PPGr was applied as an efficient and commercially available electrode for capacitive deionization studies. The electrochemical results indicated that it has shown a good specific capacitance of 65 F/g (in 1 M NaCl at 2 mV/S) and an ion removal capacitance of 5 mg/g (in 50 mL of 500 ppm NaCl). Finally, the stability of the electrode for CDI application was evaluated in constant current in 1M and constant voltages in 500 ppm of NaCl solutions. According to the results, the porous polyphosphate structure plays an important role in the electrosorption mechanism.
Keywords:
Phosphorylated graphene; Polyphosphate; Capacitive deionization; Electrochemistry; Supercapacitor
Status : Abstract Accepted (Oral Presentation)