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Core-Shell Co-Mn-Fe PBA Nano-cubes Encapsulated in Porous Nitrogen-Doped Graphene Framework for High-Performance Hybrid Capacitive Deionization

Beke Michael Abraham, Alagoa E Emmanuel, Egbo W Mansi, Kieribo Ebi, Yabefa Akpodoitei Jeremiah

Abstract

A novel hybrid material composed of core–shell cobalt-manganese-iron Prussian blue analogue (Co-Mn-Fe PBA) nano-cubes encapsulated within a porous nitrogen-doped graphene (N-G) framework was synthesized and applied as an electrode for high-performance hybrid capacitive deionization (HCDI). The structure synergistically combines high pseudocapacitive activity from the PBA core-shell and enhanced electronic conductivity and surface area from the N-G matrix. The composite achieves a high specific capacitance of 412 F/g at 1 A/g and maintains 312 F/g at 10 A/g. In a HCDI experiment, it achieved an optimal salt adsorption capacity of 32.4 mg/g at 1.2 V. The SAC maintained 92% of its original value after 50 cycles of adsorption/desorption, confirming the excellent structural stability and electrochemical reversibility of the PBA@N-G composite. A peak charge efficiency of 83.2% was reached, indicating efficient ion utilization. The results position the composite as a promising material for water purification technologies.

Keywords

Capacitive deionizationPrussian blue analoguenitrogen-doped graphene

References

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