A thermoelectric generator has a hot side heat exchanger comprising: a silicon carbide (SiC) honeycomb support with a plurality of passages. The passage walls are coated with a pyrophoric solid fuel such as red oxide (Fe2O3) in combination with a silicon (Si) binder. A quantum well thermoelectric device is positioned between the hot side heat exchanger and heat sink. The performance of the thermoelectric generator is comparable to fuel cells. The thermoelectric generator is small and portable.