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Issue 11, 2015
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Harvesting temperature fluctuations as electrical energy using torsional and tensile polymer muscles

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Abstract

Diverse means have been deployed for harvesting electrical energy from mechanical actuation produced by low-grade waste heat, but cycle rate, energy-per-cycle, device size and weight, or cost have limited applications. We report the electromagnetic harvesting of thermal energy as electrical energy using thermally powered torsional and tensile artificial muscles made from inexpensive polymer fibers used for fishing line and sewing thread. We show that a coiled 27 μm-diameter nylon muscle fiber can be driven by 16.7 °C air temperature fluctuations to spin a magnetic rotor to a peak torsional rotation speed of 70 000 rpm for over 300 000 heating–cooling cycles without performance degradation. By employing resonant fluctuations in air temperature of 19.6 °C, an average output electrical power of 124 W per kg of muscle was realized. Using tensile actuation of polyethylene-based coiled muscles and alternating flows of hot and cold water, up to 1.4 J of electrical energy was produced per cycle. The corresponding per cycle electric energy and peak power output, per muscle weight, were 77 J kg−1 and 28 W kg−1, respectively.

Graphical abstract: Harvesting temperature fluctuations as electrical energy using torsional and tensile polymer muscles

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Publication details

The article was received on 17 Jul 2015, accepted on 17 Sep 2015 and first published on 28 Sep 2015


Article type: Paper
DOI: 10.1039/C5EE02219C
Citation: Energy Environ. Sci., 2015,8, 3336-3344
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    Harvesting temperature fluctuations as electrical energy using torsional and tensile polymer muscles

    S. H. Kim, M. D. Lima, M. E. Kozlov, C. S. Haines, G. M. Spinks, S. Aziz, C. Choi, H. J. Sim, X. Wang, H. Lu, D. Qian, J. D. W. Madden, R. H. Baughman and S. J. Kim, Energy Environ. Sci., 2015, 8, 3336
    DOI: 10.1039/C5EE02219C

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