The future development of the Metal Organic Frameworks (MOF) solution for the integration and enhancement of supercapacitors may lead to developing an innovative solution to obtain water from air.
How is it possible?
The basic element to realize this task is the MOF (see Figure 1):
“Electrochemical capacitors, also known as supercapacitors, represent an important class of energy storage devices because of their high power density.1,2 Porous carbon materials such as activated carbon are commercial supercapacitors that operate by storing charge on electrochemical double layers (EDLs).3-5 This is in contrast to the storage of charge by redox reactions as exemplified by metal oxide pseudocapacitors.6-8 Each of these classes of supercapacitors has strengths and weaknesses: carbon based materials operate at a very high charge/discharge rate with a long life cycle but have low capacitance, while metal oxide materials have high capacitance but their redox reactions lead to low life cycle.1. In this study, we show how metal-organic frameworks (MOFs) 9 can be integrated into supercapacitor devices and the flexibility with which their metal oxide and organic constituents can be varied and used to uncover their high capacitance and long life cycle behavior; both are desirable features and sought after in supercapacitor research.” (Source: yaghi.berkeley.edu)
The construct for nMOF supercapacitors (Source: yaghi.berkeley.edu)
One of the main useful utilizations of the nMOF is the new device that has recently been realized and tested by researchers at the University of Berkeley California (see Figure 2):
‘In desert trials, UC Berkeley scientists demonstrated that their next-generation water harvester can collect drinkable water from desert air each day/night cycle, using a MOF that absorbs water during the night and, through solar heating during the day, releases it to be condensed and collected … .The successful field test of their larger, next-generation harvester proved what the team had predicted earlier in 2017: that the water harvester can extract drinkable water every day/night cycle at very low humidity and at low cost, making it ideal for people living in arid, water-starved areas of the world. “There is nothing like this,” said Omar Yaghi, who invented the technology underlying the harvester. “It operates at ambient temperature with ambient sunlight, and with no additional energy input you can collect water in the desert. This laboratory-to-desert journey allowed us to really turn water harvesting from an interesting phenomenon into a science.” ‘ (Source: Berkeley News)
“Markus Kalmutzki, Farhad Fathieh and Eugene Kapustin set up the water harvester for tests on a rooftop on the UC Berkeley campus. The MOF is inside the interior box, and the foil-wrapped top is designed to keep the outer box cool enough to condense the water vapor driven from the MOF by sunlight. (Stephen McNally photo)” (Source: Berkeley News)
What do you think of this type of solution to obtain water from air? If you like this, you will probably find this related YouTube video interesting.