New fuel cells that can operate at temperatures between -20 to 200°C

https://techxplore.com/news/2022-01-fuel-cells-temperatures-200c.html

"The ultra-micropores in the TB polymer act as capillaries for the PA absorption and retention... By adjusting the chemical structure of the monomer, the polymer membrane pore size and distribution could be controlled. One membrane with the pore size of about 3.5 Å showed the best siphoning effect of PA molecules, and thus the best conductivity stability and fuel cell performance"