Oxygen vacancies engineering is considered to be an effective way to enhance the electrochemical performances of metal oxides for supercapacitors. Herein, NiFe2O4‒δ with abundant oxygen vacancies was obtained through further heat treatment in activated carbon bed on the basis of hydrothermal-synthesized NiFe2O4. It was found that the treated NiFe2O4‒δ owned better conductivity as well as 3.7 times of capacitance than NiFe2O4. The overall results proved that oxygen vacancies could efficiently boost the electrochemical properties of metal oxides, leading to a potential application for supercapacitor electrode material. (Xicheng Gao, Jianqiang Bi, Linjie Meng, Lulin Xie, Chen Liu, pp. 2088–2100)
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