Jump to main content
Jump to site search

Issue 6, 2017
Previous Article Next Article

Enabling efficient heat-to-electricity generation at the mesoscale

Author affiliations

Abstract

We present a technology that efficiently harnesses the energy content of hydrocarbon fuels in a volume that is only a fraction of a cubic inch. A propane-fueled microcombustor heats a photonic crystal emitter to incandescence and the resulting spectrally-confined thermal radiation drives low-bandgap PV cells to generate electricity. We overcome the technical challenges that are currently limiting thermophotovoltaics in the following ways: we develop new fabrication processes; we adopt high-temperature alloys to improve the thermo-mechanical stability; we adopt commercial polycrystalline tantalum to fabricate large-area photonic crystals; and finally, we develop a passivation coating for improved thermo-chemical stability. We demonstrate unprecedented heat-to-electricity efficiencies exceeding 4%, greater than the 2–3% efficiencies that were previously thought to be the practical limit, and we predict that over 12% efficiency is achievable with only engineering optimization. For reference, a 1.5% efficiency corresponds to the energy density of lithium ion batteries. This work opens new opportunities to free portable electronics, robots, and small drones from the constraints of bulky power sources.

Graphical abstract: Enabling efficient heat-to-electricity generation at the mesoscale

Back to tab navigation

Supplementary files

Article information


Submitted
07 Feb 2017
Accepted
09 May 2017
First published
23 May 2017

Energy Environ. Sci., 2017,10, 1367-1371
Article type
Communication

Enabling efficient heat-to-electricity generation at the mesoscale

W. R. Chan, V. Stelmakh, M. Ghebrebrhan, M. Soljačić, J. D. Joannopoulos and I. Čelanović, Energy Environ. Sci., 2017, 10, 1367
DOI: 10.1039/C7EE00366H

Social activity

Search articles by author

Spotlight

Advertisements