Heat Recovery Assisted by Thermo-magnetic-electric Conversion
2020
Converting waste
heat into electricity is a promising strategy
to address the ever-growing energy crisis. Ferromagnets have potential
in heat recovery because of their thermo-induced magnetic transition.
However, the conventional thermomagnetic generator based on ferromagnets
requires rapid temperature fluctuation, which is difficult to be satisfied
in a real-world environment. Here, we report a thermomagnetic-electric
energy harvester consisting of a piezoelectric film and a magnetic-phase-transition
alloy with low magnetization at low temperature but high magnetization
at high temperature. The thermomagnetic-electric conversion in this
device is a product effect, that is, the heat is first converted to
kinetic energy because of thermo-induced magnetic transition, then
to electric energy owing to the piezoelectric effect. The maximum
short-circuit current and open-circuit voltage of this thermomagnetic-electric
energy harvester approach 1.27 μA and 25 V, respectively. The
magnetic-phase-transition alloy-based thermomagnetic-electric energy
harvester has the capability to automatically convert the waste heat
from a high temperature source into electric energy without rapid
temperature fluctuation.
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