Enhanced capacitive deionization performance using Mn-doped activated carbon electrodes for energy-efficient brackish...

Area of Science:

• Materials Science
• Electrochemistry
• Environmental Engineering

Background:

• Capacitive deionization (CDI) is a promising desalination technology.
• Electrode material properties critically influence CDI efficiency.
• Optimizing electrode materials is key to advancing CDI performance.

Purpose of the Study:

• To synthesize and evaluate manganese-doped activated carbon (Mn-AC) electrodes for enhanced CDI.
• To investigate the effect of Mn doping on electrode structure, stability, and electrochemical properties.
• To assess the performance of Mn-AC electrodes in brackish water desalination.

Main Methods:

• Hydrothermal synthesis of Mn-AC electrodes with varying KMnO4 concentrations.
• Structural and morphological characterization using XRD, FTIR, SEM, and elemental mapping.
• Electrochemical performance evaluation via cyclic voltammetry and chronoamperometry.
• CDI performance testing under different voltages and NaCl concentrations.

Main Results:

• Successful incorporation of Mn into activated carbon structure confirmed.
• Mn-AC electrodes exhibited improved thermal stability and higher specific capacitance.
• Optimized Mn-AC electrodes demonstrated significantly enhanced ion adsorption capacity.
• A 33% increase in adsorption efficiency was observed with Mn-AC compared to pristine AC at +1.2 V and 0.1 M NaCl.

Conclusions:

• Manganese doping effectively enhances the performance of activated carbon electrodes for CDI.
• Mn-AC electrodes offer a superior and sustainable solution for brackish water desalination.
• This research paves the way for developing high-performance CDI systems.