Kirkendall Growth and Ostwald Ripening Induced Hierarchical Morphology of Ni–Co LDH/MMoSx (M = Co, Ni, and Zn) Heteronanostructures as Advanced Electrode Materials for Asymmetric Solid-State Supercapacitors

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Abstract
By changing the mixed metal sulfide composition, morphology tuning of the active electrode material can be possible, which can show a huge impact on its electrochemical performance. Here, an effective morphology tuning of the NiCo LDH/MMoSx (M = Co, Ni, and Zn) heteronanostructures is demonstrated by varying the composition of the MMoSx. Taking advantage of the benefits associated with Kirkendall growth and Ostwald ripening, tunable morphologies were successfully achieved. Among the NiCo LDH/MMoSx (M = Co, Ni, and Zn) heteronanostructures, the NiCo LDH/NiMoSx core-shell structured electrode delivers high specific capacity of 404 mA h gat 3 mA cm, as well as extraordinary cycling stability (after 10,000 cycles) of 93.2 % at 50 mA cm. In addition, ASC device coupled with NiCo LDH/NiMoSx as a cathode and Fe2O3/rGO as an anode exhibits excellent cell capacity and extraordinary cycling stability. Moreover, ASC device provides very high specific energy of 72.6 Wh kg1 at a specific power of 522.7 W kg1 and maintained the specific energy of 23.5 Wh kg at 5357.6 W kg demonstrating high applicability to energy storage devices.
Funding Information
  • National Research Foundation of Korea (NRF-2017R1A2B3004917)

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