期刊
CERAMICS INTERNATIONAL
卷 46, 期 10, 页码 15793-15800出版社
ELSEVIER SCI LTD
DOI: 10.1016/j.ceramint.2020.03.126
关键词
Co3O4/SnO2-SnO; Pseudo-capacitors; Core-shell; Surface electron density
资金
- National Natural Science Foundation of China [21865002]
- Major Project of North Minzu University, China [ZDZX201802]
We successfully synthesized a novel core-shell hybrid metal oxide via a simple one-step hydrothermal method without annealing. This composite of Co3O4 particles covered with SnO2-SnO (Co3O4@SnO2-SnO) predicted better performance compared to pure Co3O4, which strongly depends on the synthetic temperature. The Co3O4@ SnO2-SnO prepared at a temperature of 250 degrees C (labeled Co3O4@SnO2-SnO-250) exhibited an outstanding specific capacitance of 325 F g(-1) under the current density of 1 A g(-1), which was much higher than those of Co3O4 (12.6 F g(-1)) and other composites. Additionally, the sample also exhibited good cycle stability performance with a retention rate of 100% after 5000 cycles at a current density of 5 A g(-1). Through X-ray photoelectron spectroscopy analysis, the presumed mechanism was that Sn-O-x decreases the surface electron densities of Co3O4, which is beneficial to OH- adsorption and specific capacitance improvement, and the synthetic temperature had a strong impact on the microstructure and thus on the surface electron densities. The most. obvious finding to emerge from this study is that the specific capacitance can be improved through adjusting the surface electron densities of transition metal oxides.
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