Abstract
This work reported the synthesis of zinc oxide (ZnO) based nitrogen doped graphene oxide (N-GO) with polyaniline (PANI) composite (ZnO/N-GO/PANI) as a potential flow electrode for flow capacitive deionization (FCDI). The prepared ZnO/N-GO/PANI composite was characterized for its structural property, stability, thermal decomposition and surface area analysis using X-ray diffractometer (XRD), scanning electron microscope (SEM), thermo-gravimetric analyzer (TGA) and Brunauer–Emmett–Teller (BET) respectively. Electrochemical studies were performed for the ZnO/N-GO/PANI composite using an electrochemical workstation with a three-electrode setup. SEM analysis revealed that the ZnO/N-GO/PANI composite architectures are made up of spherical and flake-like particles with an average particle size of ~ 32 nm. XRD results confirmed the crystalline nature of the ZnO/N-GO/PANI composite with sharp and intense peaks. BET analysis revealed that ZnO/N-GO/PANI composite has a greater surface area and pore size of 31.65 m2 g−1 and 66.981 nm respectively than ZnO/N-GO composite of 15.98 m2 g−1 and 42.09 nm. The prepared ZnO/N-GO/PANI composite exhibited a higher specific capacitance of 628.4 F g−1 in 0.1 M KCl electrolyte solution determined using cyclic voltammetry (CV) studies. The proposed ZnO/N-GO/PANI composite was identified to be a favourable electrode for flow capacitive deionization (FCDI) technique. The FCDI results revealed that ZnO/N-GO/PANI flow electrode has a high electrosorption capacity (288 mg g−1) and desalinating efficiency (38.1%) under a 1000 mg L−1 of sodium chloride (NaCl) solution at 1.2 V. Therefore, the proposed ZnO/N-GO/PANI composite was identified to be a promising electrode material for FCDI operation.
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The authors confirm that the data supporting the findings of this study are available within the article. Raw data that support the findings of this study are available from the corresponding author upon reasonable request.
Abbreviations
- GO:
-
Graphene oxide
- N-GO:
-
Nitrogen doped graphene oxide
- ZnO/N-GO:
-
Zinc oxide based nitrogen doped graphene oxide
- ZnO/N-GO/PANI:
-
Zinc oxide based nitrogen doped graphene oxide with polyaniline
- XRD:
-
X-ray diffraction
- SEM:
-
Scanning electron microscope
- FTIR:
-
Fourier transform infra-red
- BET:
-
Brunauer–Emmett–Teller surface area
- TGA:
-
Thermo-gravimetric analyzer
- CV:
-
Cyclic voltammetry
- CDI:
-
Capacitive deionization
- FCDI:
-
Flow capacitive deionization
- NaCl:
-
Sodium chloride
- EDL:
-
Electrical double-layer
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Funding
The authors would like to gratefully acknowledge the support of Department of Science and Technology (DST), SEED Division, New-Delhi, India for providing financial support for this work (Grant: DST (SEED); SP/YO/2019/1047). Department of Chemical Engineering, A.C. Tech, Anna University Chennai is also acknowledged for providing facilities to perform characterization studies like SEM, Electrochemical studies etc. and other infrastructure facilities to carry out this work.
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HHAM carried out the FCDI experimental works and drafted the manuscript. SPT designed, coordinated this research, and revised the manuscript. SR & NM carried out the physical characterisation analysis of the synthesised electrode material, BN conceived the study and participated in research coordination. The authors read and approved the final manuscript.
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Mansoor, H.H.A., Thomas, S.P., Ramanujam, S. et al. Synthesis of zinc oxide based nitrogen doped graphene oxide with polyaniline (ZnO/N-GO/PANI) flow electrode for desalination application using flow capacitive deionization. J Mater Sci: Mater Electron 34, 1081 (2023). https://doi.org/10.1007/s10854-023-10536-1
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DOI: https://doi.org/10.1007/s10854-023-10536-1