A novel graphene oxide-based ceramic composite as an efficient electrode for capacitive deionization

Fahad S. Al-Mubaddel,Khalil Abdelrazek Khalil,Moaeed Motlak,Nasser A. M. Barakat

doi:10.1038/s41598-020-66700-8

Abstract

In this study, N-doped and TiO2-decorated graphene oxides were developed as efficient nonprecious electrodes for capacitive deionization. The activity of this new material was evaluated in situ and in vivo. The performance of the synthesized material was measured in different saline solutions (0.1, 0.5 and 1.0 M NaCl) as an electrolyte. The results showed that the new material exhibits very good performance (157 F/g at 5 mV/s and 1.0 M NaCl compared to 19.5 F/g for pure graphene oxide). In the desalination test, which was performed in batch mode, the salt adsorption capacity and the efficiency of salt removal were 9.2 mg/g and 98%, respectively. To check the stability, the desalination test was repeated several times, and no change in the performance was observed. The results provide evidence that the newly synthesized material is a potential electrode material for CDI water desalination with satisfactory salt removal ability.

Highlights

The ability of an electrode to absorb ions basically depends on the surface properties of the electrode material, such as the electrical conductivity, surface area, and pore size and distribution
The electrode is the main part of Capacitive deionization (CDI) unit. the salt adsorption capacity (SAC) of the CDI electrode material strongly depends on the properties including high electrical conductivity, large capacitance, high wettability and electrochemical stability
graphene oxide (GrO) with enough oxygen functional groups, small particles, and massive exposed edge sites offers a promising matrix for surface modification, especially for heteroatom doping

Summary

Introduction

The ability of an electrode to absorb ions basically depends on the surface properties of the electrode material, such as the electrical conductivity, surface area, and pore size and distribution. TiO2 and N-doped graphene oxides have been developed as efficient nonprecious electrodes for capacitive deionization.

Results

Conclusion