Abstract
• Co 0.85 Se-CTAB was successfully prepared through one-pot hydrothermal method. • Co 0.85 Se-CTAB as magnesium-ion battery cathode material showed a high capacity and fast activation rate. • Two-step magnesium storage mechanism of Co 0.85 Se-CTAB as cathode in MIBs was revealed. Co 0.85 Se with Cetyl-trimethylammonium bromide (CTAB) prepared by the one-pot hydrothermal method is used as a cathode material for magnesium ion battery (MIB) for the first time. It exhibits higher initial capacity (348 mAh g -1 ) and reversible capacity (127 mAh g -1 ) than that of the untreated Co 0.85 Se. The obvious improvement can be ascribed to the enhanced conductivity and the lowered charge-transfer resistance (R ct ) when CTAB is introduced. Moreover, the two-step magnesium storage mechanism of Co 0.85 Se-CTAB in MIB is investigated. This work provides a novel method to enhance the electrochemical properties of metal selenides as electrodes for magnesium ion batteries by adding CTAB cationic surfactants.
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