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- 저자 : Yuzhu Xing (검색결과 2 건)
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Yuzhu Xing,Yan Dong,Jifan Zhao,Zhiqiang Zhang,Yue Wang 한국탄소학회 2023 Carbon Letters Vol.33 No.6
In recent years, supercapacitors have attracted extensive attention due to their advantages such as fast charge and discharge rate, high power density and long cycle life. Because of its unique porous structure and excellent electrochemical properties, heteroatom-doped porous carbon (HPC) is deemed as a promising electrode material for supercapacitors. However, it is a great challenge to synthesize electrode materials with large surface area, ultra-high porosity and good electrochemical performance. In this work, two-dimensional conjugated microporous polymers (CMPs) containing ketones were synthesized by a simple one-step coupling reaction and used as carbon precursors. A series of samples (CMP-Ts) were prepared with the procedures of coupling reaction and carbonization. The optimized carbon material has high specific surface area (up to 2229.85 m2 g? 1), porous structure, high specific capacitance (375 F g? 1 at 0.5 A g? 1), and good cycling stability (capacitance retention of 98.8% after 1000 cycles at 5 A g? 1). Further, the supercapacitor has an energy density of 28.8 Wh kg? 1 at a power density of 5000 W kg? 1. This work lays a foundation for the preparation of carbon materials using microporous polymer as a precursor system, provides a new way of thinking, and demonstrates a great potential of high-performance supercapacitors.
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Numerical Extraction of the Equivalent Circuit for a Basic Magnetoelectric Dipole Antenna
Li Zhiyi,Tang Yuzhu,Zhao Zhifan,Deng Linwan,Zeng Hongzheng,Chen Xing 한국전자파학회 2024 Journal of Electromagnetic Engineering and Science Vol.24 No.2
Magnetoelectric dipoles have attracted global research attention due to its broadband, unidirectional, and high front-to-back ratio characteristics. This study implemented a co-simulation between a basic magnetoelectric dipole and its front feeding circuit through the step-by-step numerical extraction of its equivalent circuit model equipped with lumped and frequency-independent components. First, the series resonance subcircuit was derived from the series resonance point in the impedance of the magnetoelectric dipole. Second, the parallel resonance sub-circuit was achieved based on the parallel resonance point. By combining the series and parallel sub-circuits according to the sequence of their resonance frequency, the final form of the equivalent circuit for the basic magnetoelectric dipole was realized. Furthermore, to obtain the component values of the proposed circuit, a numerical fitting technique was adopted to accurately match the input impedance of the antenna and its equivalent circuit. A comparison of the circuit and antenna electromagnetic simulations showed that they agreed well with each other. Hence, the correctness and feasibility of the extraction process were verified. The overall results showed that the proposed circuit model can easily substitute for a basic magnetoelectric dipole in the implementation of antenna/circuit cosimulation in circuit simulators.
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