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RISS 인기검색어
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- 저자 : Zhengmin Yu (검색결과 2 건)
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Zhengmin Yu,Xiaoli Su,Denghu Wei,Shu-Juan Yao,Huiyan Ma,Hui Zhao,Xipeng Pu,Wenzhi Li,Jie Wang 성균관대학교(자연과학캠퍼스) 성균나노과학기술원 2019 NANO Vol.14 No.4
3D structure composite made of tiny basic nickel carbonate arrays on the surface of reduced graphene oxide nanosheets (G-NiCH) are prepared by the hydrothermal method. The specific surface area of the G-NiCH composites is twice that of single basic nickel carbonate, which is due to the tiny basic nickel carbonate arrays structure wherein each individual nanoneedle is about 20 nm in length and 2 nm in width. The G-NiCH electrodes display high-efficiency electrochemical performance with good specific capacitance (1230 F g -1) and excellent stability (100% capacitance retention after 2000 cycles). This is attributed to the synergistic effect that reduced graphene oxide offer fast electron transmission path and basic nickel carbonate act as high effective active material.
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Modelling and Optimization of a Magnetic Spring Based Electromagnetic Vibration Energy Harvester
Liao Haojun,Ye Tingcong,Pang Yu,Feeney Ciaran,Liu Lei,Zhang Zhengmin,Saha Chitta,Wang Ningning 대한전기학회 2022 Journal of Electrical Engineering & Technology Vol.17 No.1
This paper presents the development of an AA battery size electromagnetic vibration energy harvester with an aim to maximize the output power density. A tube shape and stacked opposing permanent magnets with magnetic spring were used to suit the shape constraint as well as to achieve high fl ux linkages. An initial prototype of electromagnetic vibration harvester with AA battery size was built and tested on a controllable shaker to obtain its output voltage and power level at diff erent frequencies for fi xed accelerations. A single magnet was fi xed at the bottom of the harvester to provide levitation force in this development in order to lower the resonant frequency. A special time-domain based analytical model was also developed using both Finite Element Analysis and Simulink simulation. The time-domain analytical model is easier to implement than other frequency domain based analytical models which generally applied in literatures for modelling of the electromagnetic vibration energy harvesters. The analytical model was verifi ed by the measured results obtained from the initial prototype. The validated analytical model was successfully applied to optimize the harvester. Two more generator prototypes were further built and tested after the optimization study. The optimized harvester using three stacked opposing permanent magnets could achieve a normalized power density of 12,655 μWcm −3 g −2 at 9.9 Hz frequency with 0.22 g acceleration, which is signifi cantly higher than other reported electromagnetic vibration energy harvesters
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