A video link for this is: Charge your cell phone with FIRE? PELTIER THERMOELECTRIC COOLER Campfire Electricity - YouTube
This is how I charge car batteries off the gasifier!
You’ll be lucky to charge a cell phone on that setup. It’s a neat idea, but thermoelectric generators are extremely expensive for the power they produce. Most of the ones you see around produce 2-3 watts at the most.
There is one company making bigger units for wood stoves: http://www.tegpower.com/ Their 200w model will set you back $1,900.