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- 저자 : Miao Zongcheng (검색결과 2 건)
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Yang Zhao,Yuzhen Zhao,Yuhua Niu,Yongming Zhang,Zongcheng Miao 한양대학교 세라믹연구소 2020 Journal of Ceramic Processing Research Vol.21 No.3
Calcium copper titanate (CaCu3Ti4O12, CCTO) particles with three types of particle size (CCTO–i, CCTO–ii, CCTO–iii) areprepared by wet chemical method. And then the dielectric composites based on CCTO particles and Phenol formaldehyderesin (PF) are fabricated by mixing and mould pressing. This paper mainly studies the microstructure and dielectric propertiesof CCTO/PF dielectric composites (CCTO–i, CCTO–ii and CCTO–iii composites). XRD, FTIR and SEM indicate that theCCTO particles are dispersed in the polymer matrix. In addition, the effect of particle size on the dielectric properties ofCCTO/PF composites is also discussed. By comparing the CCTO/PF composites with different particle sizes, it is found thatthe CCTO–i composite has a high maximum dielectric constant and low loss at room temperature of 100 Hz, while the CCTOvolume fraction was 0.5 in the measurement frequency range, which shows a very weak frequency dependence. On this basis,the CCTO–i composite with relatively small particle size has excellent dielectric properties, which may imply that the effectof interface will be changed by smaller particle size.
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Rational design of porous NiCo2S4 nanotubes for hybrid supercapacitor
Wang Haiyang,Liang Miaomiao,He Zemin,Guo Zhun,Zhao Yang,Li Kexuan,Song Wenqi,Zhang Yongming,Zhang Xin,Zhao Yuzhen,Miao Zongcheng 한국물리학회 2022 Current Applied Physics Vol.35 No.-
The nanotube-consisted flower-like NiCo2S4 is successfully fabricated by a novel two-step hydrothermal technique. X-ray diffraction (XRD) identifies the spinel structure, scanning electron microscopy (SEM) and transmission electron microscopy (TEM) imply the flower-like morphology of the synthesized NiCo2S4. The electrochemical behaviors are studied by cyclic voltammetry and galvanostatic charge-discharge measurements. The NiCo2S4 nanotubes demonstrate enhanced pseudocapacitive performance of 429.5 C g− 1 at current density of 0.5 A g− 1 . The NiCo2S4//AC device delivers high energy density of 37.69 Wh kg− 1 , maximum power density of 4000.6 W kg− 1 and satisfied cycle property of 96% capacitance retention after over 7000 cycles. The results show that the NiCo2S4 nanotubes are promising electrode material for high performance supercapacitor applications.
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