Abstract
Mixed transition metal molybdate oxides (AMoO4 where A= Ni, Co, Fe, Mn) manifest high capacities (≈ 980 mAh g − 1) via the multiple redox reactions, with the Mo ranging from Mo6+ to Mo0. What's more, this dual metal oxides exhibit superior performance to single transition metal oxide, as a result of the synergic effects of multiple transition metals and the better electrical conductivity than that of single metal oxide. Bimetallic MnMoO4 shows satisfied performance in lithium ion batteries (LIBs), but its performance in sodium ion batteries (SIBs) and potassium ion batteries (PIBs) has not been exploited. On account of this, a carbon encapsulated MnMoO4 microrod is designed as the anode material in SIBs and PIBs. It is detected that the electrochemical performance of the carbon encapsulated MnMoO4 microrods in SIBs is highly boosted with respect to the bare MnMoO4. In view of the pseudocapacitance effect of MnMoO4 microrods in SIBs, a sodium ion capacitor (SIC) based on MnMoO4 capacitor-type anode and Na3V2(PO4)3 battery-type cathode is employed and displays high energy densities of 168 and 88 Wh kg−1 at 240 and 4000 W kg−1.
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