Advancement of sorption-based heat transformation by a metal coating of highly-stable, hydrophilic aluminium fumarate MOF

The distinctive water sorption properties of microporous aluminium fumarate (s-shaped isotherm{,} narrow hysteresis{,} loading >0.3 g g-1 at a relative pressure as low as p/p0 = 0.3 under realistic working conditions) permit a large advancement of MOF-based sorption heat transformation processes{,} especially as we demonstrate that the favourable sorption properties are accompanied by an unprecedented cyclic hydrothermal stability. With regard to the application of heat transformation{,} where unhindered heat and mass transfer are crucial for fast ad-/desorption cycles and a high power density{,} the question of proper shaping was also addressed. A 300 [small mu ]m thick{,} polycrystalline{,} thermally well coupled and highly accessible coating of microporous aluminium fumarate was deposited on a metal substrate via the thermal gradient approach{,} and found to be stable for the first 4500 ad-/desorption cycles with water vapour.