Journal
DALTON TRANSACTIONS
Volume 41, Issue 43, Pages 13284-13291Publisher
ROYAL SOC CHEMISTRY
DOI: 10.1039/c2dt31916k
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Funding
- National Natural Science Foundation of China [21201010, 21073129, 21071006]
- Department of Science and technology of China for the 863 project [2009AA03Z225863]
- Henan Province of Science & Technology Foundation [122102210253]
- project of Science & Technology of Anyang City
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Porous ZnO-NiO composite micropolyhedrons have been successfully synthesized by calcination of mixed oxalate (Zn0.9Ni0.1(C2O4)(2)center dot nH(2)O) precursors in air. The oxalate precursor micropolyhedrons were synthesized by a mild chemical precipitation method without any template or surfactant, and found to have a relatively low decomposition temperature. We have successfully explored the application of the resulting porous ZnO-NiO composite micropolyhedrons as electrochemical capacitors. Electrochemical study shows that the obtained ZnO-NiO composites under different conditions have different electrochemical supercapacitor properties in 3.0 or 1.0 M KOH solutions. The porous ZnO-NiO micropolyhedron material (P1) obtained by calcination of the oxalate precursor at 400 degrees C has a large specific capacitance 649.0 F g(-1) in 3.0 M KOH solution and could maintain 99.1% of this value after 400 cycles at 5.8 A g(-1). Even at a high current density of 58.0 A g(-1), the specific capacitance of P1 is 395.2 F g(-1).
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