Pressure-induced water producing using a copper–chromium Prussian blue analog

Abstract

To solve the deterioration of water resource environment, on-site water production technologies have garnered attention. Here, we demonstrate the example of pressure-induced water production using a copper–chromium Prussian blue analog (CuCr PBA). Applying pressure caused water droplets to generate from the CuCr PBA. Collecting the water droplets with a pipette revealed that approximately 240 g of water was obtained per 1 kg of CuCr PBA. One possible mechanism of the water production could be the hydrophobization of pores at defect sites based on partial electron transfer from the oxygen of ligand water to copper upon pressure application. This article presents a new approach to water production, which is an important step towards the further development of the water environmental improvement technology.