Facile synthesis and enhanced desalination performance of a novel layered Na4Mn14O27 made from earth-abundant element in capacitive deionization

Abstract

Abstract Capacitive deionization (CDI) is currently restricted by inferior desalination performance. To overcome this limitation, exploring novel intercalation materials is ongoing. A major research interest has been focused on the layered compounds due to their open structures which facilitate ions insertion/extraction. Herein, based on the earth-abundant element, we report a novel layered Na4Mn14O27 via a facile method of one-step calcination. The as-obtained sample exhibits a high desalination capacity of 76.6 mg/g in 500 mM NaCl solution with a voltage of 1.0 V. Long-term desalination test and GCD measurement reveal the as-obtained Na4Mn14O27 sample with excellent stability and recyclability. In additional, high charge efficiency of 0.73∼0.98 is attained as the voltage alters from 0.6 to 1.4 V and the salt concentration varies from 5 to 500 mM. Such remarkable performances indicate the Na4Mn14O17 with a considerable promise for high-performance desalination.