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Exceeding milli-watt powering magneto-mechano-electric generator for standalone-powered electronics

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Abstract

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)O3–Pb(Zr,Ti)O3 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 μT magnetic field.

Graphical abstract: Exceeding milli-watt powering magneto-mechano-electric generator for standalone-powered electronics

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Publication details

The article was received on 05 Dec 2017, accepted on 19 Jan 2018 and first published on 05 Feb 2018


Article type: Paper
DOI: 10.1039/C7EE03429F
Citation: Energy Environ. Sci., 2018, Advance Article
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    Exceeding milli-watt powering magneto-mechano-electric generator for standalone-powered electronics

    V. Annapureddy, S. Na, G. Hwang, M. G. Kang, R. Sriramdas, H. Palneedi, W. Yoon, B. Hahn, J. Kim, C. Ahn, D. Park, J. Choi, D. Jeong, A. B. Flatau, M. Peddigari, S. Priya, K. Kim and J. Ryu, Energy Environ. Sci., 2018, Advance Article , DOI: 10.1039/C7EE03429F

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