At Tuesdays COP26 session called Economics of Climate Change a company called Infinite Power proposed a carbon neutral way to provide baseload for electricity grid. Their technology claims work by a "kinetic junction" a p-n junction optimized to turn alpha-, beta- or gammaradiation into electrical energy. This video contains more detailed technical claims including views of their radioactive material. In it they assemble and demonstrate a demo unit which charges an USB device (so the cell should be able to generate 2.5 W). They further claim a 1 cubic meter of (larger wafers of) such cells can provide 10kW peak and 9 million KWh life time power (probably continuously falling) over 100 years.
Is this plausible?
In particular does there exist an radioactive material (including it's decay products) that matches all these criterias:
Is there any radioactive material which has a sufficient energy density to produce so much power?
Is there any radioactive material which has a sufficient half life to produce so much energy over 100 years?
Is there any radioactive material that could be made with low enough price to make this financially plausible?
I am aware that betavoltaics with a single digit percentage efficiency exist in the literature what kind of efficiency would be required to make this work as assumed when answering above questions.
The company existed previously under a different name: Kinetic Energy
The inability to control decay is hailed as feature to supply baseload. The decay of the material is not acknowledged since there is a complete decay chain, maybe it is sorta compensated.
It's obvious that 72*2.5 W doesn't equal 10kWh but those are demonstrator units only which have lots of empty space in them. The fact that those "laboratory scale units" are not meant to be the final product is acknowledged here.