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Licensee MDPI, Basel, Switzerland. This article is an open access article distributed under the terms and conditions of the Creative Commons Attribution (CC BY) license (http://creativecommons.org/licenses/by/4.0/).
Adsorption energy on rGO and WS2 of O2, NO2 and H2O molecules. Note that negative adsorption energy means that the adsorption process is exothermic and energetically favorable.