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Targeted synthesis of ionic liquid-polyoxometalate derived Mo-based electrodes for advanced electrochemical performance by Guojian Chen; Lei Zhang; Yadong Zhang; Ke Liu; Zhouyang Long; Ying Wang is a Engineering article available to read on EtoBox.

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Rational design of advanced electrode materials with high capacity and long cycle stability is a great challenge for both lithium and sodium storage. In this work, we report a versatile strategy for the synthesis of N/P-codoped MoO 2 @carbon (N/P-MoO 2 @C) electrodes via a simple pyrolysis of ionic liquid-based polyoxometalate (IL-POM) molecular precursors. The contents of C, N, and P, and the pore geometry of N/P-MoO 2 @C networks can be easily tailored by adjusting the position of cyano groups in the IL-POM precursor. Benefiting from this novel design, the optimized N/P-MoO 2 @C4 electrode with cross-linked porous tunnels and abundant defects exhibits excellent lithium storage performance, with a high reversible capacity of 1381 mA h g À1 after 100 cycles at 0.5 A À1 , and 346 mA h g À1 after 5000 cycles at 20 A g À1 . The Li + storage performance of this N/P-MoO 2 @C4 is dominated by pseudocapacitance behavior, which contributed to the high reversible capacity and long cycle stability. Exceptional sodium storage performance is also observed in the N/P-MoO 2 @C4 electrode with 0.02% capacity decay per cycle over 1100 cycles at 1.0 A g À1 . The present approach provides some insig

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Author

Guojian Chen; Lei Zhang; Yadong Zhang; Ke Liu; Zhouyang Long; Ying Wang

Published

2019

Language

EN

Field

Engineering (Physical Sciences)