Manganese dioxide was synthesized by electrodeposition method with Mn (CH 3 COO) 2 ·4H 2 O as a raw material. La(NO 3 ) 3 ·6H 2 O was doped in electroyte during the preparing process to improve the performance of MnO 2 electrodes. The micrographs, crystal structure and element content of electrodes were analyzed by SEM, XRD and atomic absorption spectroscopy, respectively. It is found that the La content ratio in the dioxide can be easily controlled by adjusting the composition of the plating solution. Appropriate amount of doped La can increase the surface area of Mn/La materials, resulting in the supercapacitive behavior enhancement. Electrochemical tests show that the specific capacitance is significantely increased from 198.72 F·g -1 to 276.60 F·g -1 by La-doping.
Easy oxidation of carbon limits applications of carbon-carbon composites in an oxygen-containing environment. In this study, a two-layer SiC coating was prepared on carbon-carbon composites by a Spark plasma sintering technology at 1350˚C for 1 min. The coating was mainly composed of β-SiC and Si and well bonded with the substrate. The double SiC coating could effectively protect the C/C composites from oxidation at 1600˚C for 120 h, and the corresponding weight loss was only 2.62%.
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