期刊
ENERGY & ENVIRONMENTAL SCIENCE
卷 8, 期 8, 页码 2402-2408出版社
ROYAL SOC CHEMISTRY
DOI: 10.1039/c5ee00414d
关键词
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资金
- Basic Science Research Program through the National Research Foundation of Korea [NRF-2012R1A1A2A10041947]
- Global Frontier R&D Program on Center for Hybrid Interface Materials (HIM) - Ministry of Science, ICT & Future Planning [2013-073298]
- Office of Naval Research through the Center for Energy Harvesting Materials and Systems (CEHMS)
Stray magnetic field considered as harmful noise for the human body can be a ubiquitous energy source. We are surrounded with 50/60 Hz parasitic magnetic noise arising from power delivery infrastructure, but it cannot be readily utilized by traditional electromagnetic harvesters. Here, we introduce a novel magnetomechano- electric (MME) generator with a colossal power density that can turn on 35 LEDs and drive a wireless sensor network under a weak magnetic field of 5-7 x 10(-4) T at a low frequency of 60 Hz. The MME generator is a cantilever structured magnetoelectric (ME) laminate composite in which the < 011 > oriented anisotropic single crystal fiber composite (SFC) is bonded to Ni plate and Nd permanent magnet proof mass. The ME laminate composite has a strong ME coupling (alpha(ME) similar to 160 V cm(-1) Oe(-1)) even without magnetic bias due to the intrinsic property of Ni. The MME generator is also found to exhibit a colossal output power density of 46 mW cm(-3) Oe(-2) under a weak magnetic field of 1.6 x 10(-4) T at 60 Hz. This MME generator can be a ubiquitous power source for wireless sensor networks, low power electric devices, and wireless charging systems by harvesting tiny amounts of parasitic magnetic energy from our living environment.
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