Preparation and electrochemical performances of ZnMoO4-ZnFe2O4 composite electrode materials

Abstract

As a typical transition metal oxide anode material, ZnMoO 4 can deliver a higher theoretical capacity of 951.6 mAh g −1 due to its variable oxidation state and alloying reaction. However, lower conductivity and huge volumetric expansion restrict its further development. Herein, the modified sol-gel method is applied to synthesize a series of (1-x)ZnMoO 4 -xZnFe 2 O 4 (x = 0.1, 0.2, 0.3, 0.4, and 0.5) composites. The effects of compound proportion of ZnFe 2 O 4 on the crystal phase structure and morphology for ZnMoO 4 have been investigated in detail. All the composites have been conducted on electrochemical measurements, and the results illustrate that the composites display better electrochemical performance than that of ZnMoO 4 . Especially for 0.6ZnMoO 4 -0.4ZnFe 2 O 4 , it can deliver a capacity of 550.7 mAh g −1 after 500 cycles at a current density of 200 mA g −1 . Moreover, it also presents the higher capacity at higher current density. The improvement of electrochemical performance should be attributed to the synergistic effect of ZnFe 2 O 4 and ZnMoO 4 . Keywords(1-x)ZnMoO 4 -xZnFe 2 O 4 composite • Anode material • Electrochemical performance