disclosed is a composite adsorbent material comprising three components , including a porous media , a hygroscopic material , and graphite flakes . among the many different possibility considered , it may be advantageous for the porous media to be mesoporous silica or the hygroscopic materials to be calcium chloride , lithium bromide , or lithium chloride . it is considered that the graphite flakes may comprise 50 percent or less of the graphite flake - hygroscopic material composition , and certain embodiments may utilize between 15 and 30 percent graphite in the graphite flake - hygroscopic material composition . it is still further considered that the graphite flakes may advantageously be less than 300 microns in size , or may have an average number of carbon planes that is 100 or less . additional materials may also be incorporated , including biologics , polymers , and catalysts .