Journal
JOURNAL OF ALLOYS AND COMPOUNDS
Volume 741, Issue -, Pages 633-641Publisher
ELSEVIER SCIENCE SA
DOI: 10.1016/j.jallcom.2018.01.048
Keywords
Prussian blue analogues; In situ transformation; Ternary metal oxides; Porous nanocubes; Supercapacitors
Categories
Funding
- National Natural Science Foundation of China [21471114, 21101118]
- State Major Research Plan (973) of China [2011CB932404]
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Three kinds of Prussian blue analogues (Ni-Fe PBA, Co-Fe PBA, Co/Ni-Fe PBA) with similar cubic nanostructures have been synthesized simply by one-step solution-precipitation method. By utilizing simultaneous oxidative decomposition and crystal growth, iron-group metal oxides (NiO/Fe3O4, Co3O4/Fe3O4, NiO/Co3O4/Fe3O4) with porous nanocubic structures have been converted successfully in situ from precursors of PBAs. When evaluated as anode materials for supercapacitors, the mixed metal oxides with a porous cubic structure manifest high specific capacity. The specific capacitance of ternary metal oxides (NiO/Co3O4/Fe3O4) is 2.3 times that of NiO/Fe3O4 and 3.7 times that of Co3O4/Fe3O4. Besides, the ternary metal oxides exhibit high rate stability (retention up to 72% even at 20 A g(-1)) and long cycle performance. The improved electrochemical performance may owe to the synergistic effect of mixed-metal-oxide porous nanostructures, which accelerates electron transport and ion diffusion. (C) 2018 Elsevier B.V. All rights reserved.
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