期刊
ENERGY & ENVIRONMENTAL SCIENCE
卷 11, 期 4, 页码 818-829出版社
ROYAL SOC CHEMISTRY
DOI: 10.1039/c7ee03429f
关键词
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资金
- Global Frontier R&D Program on the Center for Hybrid Interface Materials (HIM) - Ministry of Science, ICT & Future Planning Korea [NRF-2016M3A6B1925390]
- National Research Council of Science & Technology (NST) by the Korea government (MSIP) [CAP-17-04-KRISS]
- Korea Institute of Materials Science (KIMS) internal RD program [PNK5061]
- U.S. Office of Naval Research Global [N62909-16-1-2135]
- Office of the Basic Energy Science, U.S. Department of Energy [DE-FG02-06ER46290]
- Office of Naval of Research
In contrast to typical magnetic energy generators that use electromagnetic induction, which are bulky and have low generation efficiency under small magnetic fields at low frequency, magneto-mechano-electric (MME) generators utilizing the magnetoelectric (ME) coupling effect and magnetic interactions are considered promising candidates. MME generators will serve as a ubiquitous autonomous energy source converting stray magnetic noise to useful electric energy for applications in wireless sensor networks (WSN) for the Internet of Things (IoT) and low-power-consuming electronics. The key component in a MME generator is the ME composite consisting of piezoelectric and magnetostrictive materials, which elastically couples the electric and magnetic behaviour of the respective constituent. Here, we report a MME generator consisting of a crystallographically oriented Pb(Mg1/3Nb2/3)O-3-Pb(Zr,Ti)O-3 piezoelectric single crystal macro-fibre composite and a highly textured magnetostrictive Fe-Ga alloy, which exhibits an exceptionally high rectified DC output power density of 3.22 mW cm(-3). The large energy generation in this structure is ascribed to the coupling between the strong anisotropic properties of the piezoelectric single crystal fibres and textured Fe-Ga magnetostrictive alloy. A smart watch with IoT sensors was driven by the MME generator under a 700 mu T magnetic field.
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